Exhaust gas treatment system for the treatment of an exhaust gas stream containing one or more of formaldehyde, nitrogen oxide (NO), and hydrocarbons

Abstract

The present invention relates to an exhaust gas treatment system comprising an internal combustion engine and an exhaust gas conduit for exhaust gas from the internal combustion engine, wherein the exhaust gas conduit comprises one or more oxidation catalyst components and one or more further catalyst components, wherein independently from one another, the one or more oxidation catalyst components comprise a first washcoat layer, wherein the first washcoat layer optionally comprises Mn, and a first substrate, wherein the first substrate has an inlet end through which the exhaust gas stream may enter the oxidation catalyst component, and an outlet end through which the exhaust gas stream may exit the oxidation catalyst component, wherein the oxidation catalyst component comprises one or more platinum group metals comprising Pt, Pd, or Pt and Pd, wherein the one or more platinum group metals are at least in part contained in one or more of: (a) the first washcoat layer, and (b) an optional second washcoat layer, or (c) optional second and third washcoat layers; and wherein independently from one another, the one or more further catalyst components comprise a catalyst component washcoat layer comprising Mn, and a catalyst component substrate, wherein the catalyst component substrate has an inlet end through which the exhaust gas stream may enter the further catalyst component, and an outlet end through which the exhaust gas stream may exit the further catalyst component.

Description

[0001] Exhaust gas treatment system for the treatment of an exhaust gas stream containing one or more of formaldehyde, nitrogen oxide (NO), and hydrocarbons

[0002] TECHNICAL FIELD

[0003] The present invention relates to an exhaust gas treatment system for the treatment of an exhaust gas stream containing one or more of formaldehyde, nitrogen oxide (NO), and hydrocarbons.

[0004] INTRODUCTION

[0005] The present invention relates to an exhaust gas treatment system comprising at least one oxidation catalyst component such as a diesel oxidation catalyst (DOC) as well as at least one further catalyst component with enhanced oxidation function, in particular with enhanced oxidation function of one or more of formaldehyde (HCHO), nitrogen oxide (NO), and hydrocarbons (including diesel fuel). It is known that formaldehyde is a toxic material that is coming under increasing regulation within indoor air spaces due to its release from various building materials used in the construction industry. Tighter regulations are also being implemented for formaldehyde emissions from the engine exhaust of passenger and delivery vehicles. Generally, manganese oxides (e.g., MnO2) are known to be active for destroying formaldehyde under ambient conditions, but they do not have the required thermal stability to survive in a typical engine exhaust environment. In particular, phase transitions at high temperature (e.g., higher than 400 °C) can cause the structure of MnO2 to collapse such that the surface area and pore volume are so low as to be catalytically ineffective. One way to improve the stability of the Mn oxide at high temperature (as well as other catalytically useful base metal oxides such as copper, ceria and iron) can be to support them on refractory oxide materials which themselves have high stability when exposed to high temperatures in the engine exhaust. Materials such as aluminum oxide (AI2O3) and zirconium oxide (Zr©2) can be useful in this regard.

[0006] The key challenge for inclusion of Mn-containing base metal oxide (BMO) catalysts in technology for abatement of exhaust emissions from diesel vehicles can be seen in the intrinsically poor sulfur resistance of manganese.

[0007] It is known that Pt and Pd supported on a high temperature resistant refractory metal oxide support provides efficient oxidation of CO and HC pollutants emitted from diesel engines. Such DOC compositions are needed by vehicle manufacturers to meet ever more stringent worldwide CO and HC exhaust emission requirements. An additional function of the DOC composition when placed in the exhaust of a diesel vehicle is to oxidize diesel fuel injected into the exhaust upstream of the DOC in order to create a high temperature exotherm that is used to thermally oxidize soot that has accumulated on a diesel particulate filter (DPF) or a catalyzed soot filter (CSF) located downstream of the DOC composition. Alternatively, the hydrocarbon concentration in the exhaust stream can be increased for exotherm generation by adjusting the combustion process through various post-injection methods or the like. Temperatures greater 600 °C at the DPF or CSF inlet are preferred to provide efficient oxidation of the retained soot. The concentration of diesel fuel injected into the exhaust stream needed to provide the desired exotherm is quite high, approximately 1 % (10,000 ppm) on a C1 basis or more. The temperature at which the DOC composition can oxidize (“light-off’) the injected fuel needs to be as low as possible, preferably less than 300 °C. In addition, the amount of hydrocarbon slip bypassing the DOC catalyst during exotherm generation needs to be as low as possible, preferably less than 3,000 ppm, 2,000 ppm or even 1 ,000 ppm.

[0008] WO 2022 / 047132 A1 relates to an oxidation catalyst composition for catalytic articles, exhaust gas treatment systems for reducing formaldehyde levels in engine exhaust emissions. In particular, an oxidation catalyst is disclosed in claim 1 comprising a platinum group metal (PGM) component comprising Pd, Pt, or a combination thereof, a manganese component, and a first refractory metal oxide support material comprising zirconia.

[0009] US 10,598,061 B2 relates to methods and systems for a diesel oxidation catalyst. In particular, a method is disclosed in claim 1 comprising: generating NO2 in a catalyst comprising a washcoat with zirconium, one or more base metal oxides, and a palladium oxide, with an exhaust gas flow rate being between lower and upper threshold flow rates; and facilitating a regeneration of a particulate filter located downstream of the catalyst via NO2 when an exhaust gas temperature is greater than a threshold temperature where the palladium oxide is contained in an upstream portion of the catalyst relative to a direction of exhaust gas flow; and the one or more base metal oxides are contained in a downstream portion of the catalyst relative to the direction of exhaust gas flow.

[0010] US 10,392,980 B2 relates to methods and systems for a diesel oxidation catalyst. In particular, a method is disclosed in claim 1 comprising: passing diesel combustion exhaust gas over a diesel oxidation catalyst having a washcoat comprising zirconium oxide, palladium oxide, and at least one base metal oxide, the washcoat coated on a surface of a substrate with the at least one base metal oxide coated to a downstream portion of the substrate in a greater amount than coated to an upstream portion and the palladium oxide coated to the upstream portion of the substrate in a greater amount than coated to the downstream portion, downstream referring to an axial direction of exhaust gas flow, and where the palladium oxide is 0.5-3 weight percent of the washcoat.

[0011] WO 2021 / 198680 A1 relates to an oxidation catalyst for a diesel engine and to an exhaust system for a diesel engine comprising the oxidation catalyst. According to claim 1 , the layered diesel oxidation catalyst for treatment of exhaust gas emissions from a diesel engine comprises a flow-through monolith substrate having a honeycomb structure and comprising a front zone and a rear zone, wherein the front zone of the substrate comprises a combination of layers, one on top of another and comprising two or more of specific layers A, B and C; and the rear zone comprises a specific layer D.

[0012] US 2019 / 262772 A1 relates to an oxidation catalyst for a diesel engine and to an exhaust system for a diesel engine comprising the oxidation catalyst. In particular, an oxidation catalyst for treating an exhaust gas from a diesel engine is defined in claim 1 , comprising: a first washcoat region comprising Pt, Mn and a first support material; a second washcoat region comprising a platinum group metal and a second support material; and a substrate having an inlet end and an outlet end; wherein the second washcoat region is arranged to contact the exhaust gas at the outlet end of the substrate and after contact of the exhaust gas with the first washcoat region.

[0013] US 2017 / 009623 A1 relates to a catalyst for storing nitrogen oxides (NOx) in an exhaust gas from a lean burn engine. In particular, a catalyst for storing nitrogen oxides in an exhaust gas from a lean burn engine is defined in claims 1 , the catalyst comprising a NOx storage material and a substrate, wherein the NOx storage material comprises a NOx storage component and an NO oxidation promoter on a support material, wherein the NO oxidation promoter is manganese or an oxide, hydroxide or carbonate thereof.

[0014] US 2015 / 352493 A1 pertains to catalytic articles, and particularly those that contain both platinum group metals as well as non-platinum group metals. In particular, a catalytic article is defined in claim 1 , the catalyst comprising a first catalytic coating comprising a platinum group metal, wherein the first catalytic coating is substantially free of Cu, Ni, Fe, Mn, V, Co, Ga, Mo, Mg, Or and Zn; a second catalytic coating comprising a non-PGM metal, wherein the second catalytic coating is substantially free of a platinum group metal; and one or more substrates, wherein the first catalytic coating is separated from the second catalytic coating.

[0015] US 2018 / 318805 A1 relates to a diesel oxidation catalyst composition, catalyst articles coated with such a composition, emission treatment systems comprising such a catalyst article, and methods of use thereof. In particular, a diesel oxidation catalyst composition is defined in claim 1 , the composition comprising at least one platinum group metal impregnated onto a porous refractory oxide material in particulate form and at least one base metal oxide impregnated onto a porous refractory oxide material in particulate form, wherein the porous refractory oxide material impregnated with at least one platinum group metal and the porous refractory oxide material impregnated with at least one base metal oxide are in the form of a mixture or wherein the at least one platinum group metal and the at least one base metal oxide are impregnated on the same porous refractory oxide material.

[0016] M. C. Alvarez-Galvan et al. disclose in Applied Catalysis B. 2004, 51 , 83-91 alumina-supported manganese catalysts with manganese loadings ranging from 3.9 to 18.2 wt.%. Said catalysts were prepared and tested in the combustion of formaldehyde / methanol mixture in an air stream. US 2012 / 240554 A1 relates to a manganese-based oxides promoted lean NOx trap (LNT) catalyst. Said document discloses an exhaust gas treatment system particularly including a combination of an oxidation catalyst, a temporary storage material for nitrogen oxides, and a reduction catalyst for nitrogen oxides as part of a Lean NOx Trap (LNT) for a lean-burn internal combustion engine. More specifically, it is disclosed therein to use manganese-based oxide particles in an LNT to promote the conversion of nitrogen oxide (NO) to nitrogen (N2) in an exhaust gas treatment system of a lean-bum engine.

[0017] US 2013 / 058849 A1 relates to a system for remediating emissions and methods of use. Said document discloses a hybrid oxidation catalyst system particularly including a noble metal oxidation catalyst and a base metal oxide catalyst disposed downstream of the noble metal catalyst.

[0018] US 2015 / 252708 A1 relates to a zoned catalyzed substrate monolith. Further, an exhaust system for an internal combustion engine is disclosed therein, the system particularly comprising a lean NOx trap and a zoned catalyst substrate monolith. In Example 1 , a zoned catalyst is disclosed comprising a wall-flow substrate coated with an inlet coating comprising Pt and Pd supported on alumina-ceria mixed oxide, beta zeolite and manganese dioxide, and an outlet coating comprising Pt and Pd supported on alumina-ceria mixed oxide, beta zeolite and iron oxide.

[0019] US 2015 / 352493 A1 relates to catalytic articles containing platinum group metals and non-plati- num group metals and methods of making and using same. In the examples, a catalysts is disclosed particularly comprising a substrate, a lower layer comprising at least Cu and Mn supported on ceria, wherein an upper layer may comprise Pt supported on ceria and / or Pd supported on ceria-zirconia.

[0020] Despite the development of new oxidation catalyst technologies leading to improved performance in the treatment of exhaust gas stream containing one or more of formaldehyde, nitrogen oxide (NO), and hydrocarbons, there remains to need of the further improvement of exhaust gas treatment systems as such in this regard.

[0021] DETAILED DESCRIPTION

[0022] Therefore, it was an object of the present invention to provide an exhaust gas treatment system having an improved performance with respect to the conversion of one or more of formaldehyde, nitrogen oxide (NO), and hydrocarbons, in particular after being exposed to a sulfation and de-sulfation treatment.

[0023] It has surprisingly been found that an improved exhaust gas treatment system can be provided for the conversion of one or more of formaldehyde, nitrogen oxide (NO), and hydrocarbons in an exhaust gas. In particular, it has been surprisingly found that an exhaust gas treatment system can be provided showing an improved performance with respect to the conversion of one or more of formaldehyde, nitrogen oxide (NO), and hydrocarbons after being exposed to a sulfation and de-sulfation treatment as encountered in a typical application. In particular, it has been surprisingly found that the improvements achieved with regard to catalyst components primarily acting as oxidation catalysts in an exhaust gas treatment system may be extended to further catalyst components of an exhaust gas treatment system for affording an exhaust gas treatment system showing enhanced hydrocarbon (HC) and nitrogen oxide (NO) oxidation function. In particular, it has surprisingly been found that the benefit of using BMO-containing catalyst to reduce platinum group metal in diesel exhaust treatment systems is not limited only to catalyst components primarily used for the oxidation of formaldehyde, nitrogen oxide (NO), and hydrocarbons in an exhaust gas, but may also be extended to further catalyst components and in particular to a selective catalytic reduction (SCR) catalyst, an ammonia oxidation (AMOX) catalyst, a catalyzed soot filter (CSF), a selective catalytic reduction catalyst on filter (SCRoF), and / or to a diesel exotherm catalyst (DEC) for further improving the efficiency of the exhaust gas treatment system as a whole. This enables vehicle manufacturers to meet ever tightening vehicle emissions standards while also reducing overall PGM usage and costs.

[0024] Therefore, the present invention relates to an exhaust gas treatment system comprising an internal combustion engine and an exhaust gas conduit for exhaust gas from the internal combustion engine, wherein the exhaust gas conduit comprises one or more oxidation catalyst components and one or more further catalyst components, wherein independently from one another, the one or more oxidation catalyst components comprise a first washcoat layer, wherein the first washcoat layer optionally comprises Mn, and a first substrate, wherein the first substrate has an inlet end through which the exhaust gas stream may enter the oxidation catalyst component, and an outlet end through which the exhaust gas stream may exit the oxidation catalyst component, wherein the oxidation catalyst component comprises one or more platinum group metals comprising Pt, Pd, or Pt and Pd, wherein the one or more platinum group metals are at least in part contained in one or more of:

[0025] (a) the first washcoat layer, and

[0026] (b) an optional second washcoat layer, or

[0027] (c) optional second and third washcoat layers; and wherein independently from one another, the one or more further catalyst components comprise a catalyst component washcoat layer comprising Mn, and a catalyst component substrate, wherein the catalyst component substrate has an inlet end through which the exhaust gas stream may enter the further catalyst component, and an outlet end through which the exhaust gas stream may exit the further catalyst component.

[0028] It is preferred that, independently from one another, the one or more further catalyst components are selected from the group consisting of a selective catalytic reduction (SCR) catalyst, an ammonia oxidation (AMOX) catalyst, a catalyzed soot filter (CSF), a selective catalytic reduction catalyst on filter (SCRoF), and a diesel exotherm catalyst (DEC).

[0029] It is preferred that, independently from one another, the content of Mn, calculated as the element, in the catalyst component washcoat layer of the one or more further catalyst components is in the range of from 1 to 50 wt.-% based on 100 wt.-% of the catalyst component washcoat layer, more preferably of from 2 to 35 wt.-%, more preferably of from 3 to 25 wt.-%, more preferably of from 4 to 15 wt.-%, more preferably of from 5 to 10 wt.-%.

[0030] It is preferred that, independently from one another, Mn is present in the catalyst component washcoat layer of the one or more further catalyst components in the form of one or more cations of Mn, wherein Mn is more preferably contained in the catalyst component washcoat layer as one or more oxides, wherein Mn is more preferably contained in the catalyst component washcoat layer as one or more oxides of Mn(ll), Mn(lll), M n(l l / l 11), and Mn(IV), more preferably as one or more oxides selected from the group consisting of MnO, Mn2O3, MnsC , MnO2, and Mn(O)OH, and Mn-Zr mixed oxides, including mixtures of two or more thereof, wherein the Mn- Zr mixed oxides are preferably contained in the catalyst component washcoat layer as a solid solution.

[0031] It is preferred that, independently from one another, the catalyst component washcoat layer of the one or more further catalyst components comprises a particulate support material, wherein Mn is supported on the particulate support material, wherein the particulate support material is more preferably selected from the group consisting of ZrO2, AI2C>3, SiO2, TiO2, La2C>3-doped ZrO2, CeO2-ZrO2mixed oxide, La2C>3-doped CeO2-ZrO2mixed oxide, Nd2Os-doped CeO2-ZrO2mixed oxide, Y2Os-doped CeO2-ZrO2mixed oxide, praseodymium oxide-doped CeO2-ZrO2mixed oxide ZrO2-doped AI2C>3, ZrO2-doped SiO2, SiO2-doped AI2C>3, CuO-AI2Os mixed oxide, and mixtures of two or more thereof, more preferably from the group consisting of ZrO2, La2Os- doped ZrO2, CeO2-ZrO2mixed oxide, La2C>3-doped CeO2-ZrO2mixed oxide, Nd2Os-doped CeO2-ZrO2mixed oxide, Y2Os-doped CeO2-ZrO2mixed oxide, Pr2C>3-doped CeO2-ZrO2mixed oxide, PreOn-doped CeO2-ZrO2mixed oxide, PrO2-doped CeO2-ZrO2mixed oxide, ZrO2-doped AI2C>3, ZrO2-doped SiO2, and mixtures of two or more thereof, more preferably from the group consisting of ZrO2, La2C>3-doped ZrO2, CeO2-ZrO2mixed oxide, La2C>3-doped CeO2-ZrO2mixed oxide, Nd2C>3-doped CeO2-ZrO2mixed oxide, Y2Os-doped CeO2-ZrO2mixed oxide, Pr2Os-doped CeO2-ZrO2mixed oxide, P^On-doped CeO2-ZrO2mixed oxide, and mixtures of two or more thereof, wherein more preferably Mn is supported on particulate La2C>3-doped ZrO2, wherein preferably ZrO2is doped with La2Os in an amount ranging from 1 to 50 wt.% based on 100 wt.- % of ZrO2and La2Os, preferably from 3 to 30 wt.-%, more preferably from 5 to 15 wt.-%, more preferably from 8 to 10 wt.-%.

[0032] It is preferred that, independently from one another, the catalyst component substrate of the one or more further catalyst components is a wall-flow substrate or a flow-through substrate, more preferably a honeycomb wall-flow substrate or a honeycomb flow-through substrate, more preferably a honeycomb flow-through substrate, wherein the flow-through substrate is more preferably a flow-through substrate with high porosity walls.

[0033] It is preferred that, independently from one another, the loading of the catalyst component washcoat layer of the one or more further catalyst components is in the range of from 0.5 to 6 g / in3, more preferably of from 0.7 to 4.5 g / in3, more preferably of from 0.9 to 3.0 g / in3, more preferably of from 1 .0 to 2.5 g / in3.

[0034] Within the meaning of the present invention, the loading of a washcoat layer in the catalyst component refers to the loading of said washcoat layer based on the volume of the catalyst component in which said washcoat layer is contained. Accordingly, within the meaning of the present invention, the loading of a washcoat layer only contained in a certain portion or zone of the catalyst component is based on the volume of that portion or zone of the catalyst component. Thus, by means of examples, if a washcoat layer is provided over 50% of the axial length of a honeycomb substrate, its loading is calculated based on 50% of the total volume of the honeycomb substrate.

[0035] It is preferred that the internal combustion engine is a compression ignition engine, preferably a diesel engine. Alternatively, it is preferred that the internal combustion engine is a lean gasoline engine. In the case wherein the internal combustion engine is a lean gasoline engine, it is preferred that the internal combustion engine is powered by an oxygenated fuel, wherein the oxygenated fuel more preferably comprises one or more of methanol and biofuel.

[0036] It is preferred that the system further comprises one or more of an electric heater, a fuel burner, and a fuel injector.

[0037] It is preferred that the exhaust gas treatment system comprises in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, one or more of the oxidation catalyst components, and one or more of the further catalyst components.

[0038] According to a first alternative, it is preferred that the exhaust gas treatment system comprises in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, one of the oxidation catalyst components, one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, more preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, more preferably and an optional fuel injector and one of the further catalyst components which is a diesel exotherm catalyst (DEC), and / or, more preferably and one of the further catalyst components which is a catalyzed soot filter (CSF), and / or, more preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, more preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst.

[0039] According to a second alternative, it is preferred that the exhaust gas treatment system comprises in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, one of the oxidation catalyst components, a further one of the oxidation catalyst components, one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, more preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, more preferably and an optional fuel injector and one of the further catalyst components which is a diesel exotherm catalyst (DEC), a diesel particulate filter (DPF), and / or, more preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, more preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst.

[0040] According to a third alternative, it is preferred that the exhaust gas treatment system comprises in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, one of the oxidation catalyst components, a further one of the oxidation catalyst components, one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, more preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, more preferably and an optional fuel injector and one of the further catalyst components which is a diesel exotherm catalyst (DEC), a diesel particulate filter (DPF), and / or, more preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, more preferably and one of the further catalyst components which is an ammonia oxidation (AMOX) catalyst.

[0041] According to a fourth alternative, it is preferred that the exhaust gas treatment system comprises in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, one of the oxidation catalyst components, a further one of the oxidation catalyst components, one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, more preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, an optional fuel injector, a further one of the oxidation catalyst components, a diesel particulate filter (DPF), and / or, more preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, more preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst.

[0042] According to a fifth alternative, it is preferred that the exhaust gas treatment system comprises in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, one of the oxidation catalyst components, a further one of the oxidation catalyst components, one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, more preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, an optional fuel injector, a further one of the oxidation catalyst components, a further one of the oxidation catalyst components, wherein the first substrate is a wall-flow substrate, and / or, more preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, more preferably and one of the further catalyst components which is an ammonia oxidation (AMOX) catalyst.

[0043] According to a sixth alternative, it is preferred that the exhaust gas treatment system comprises in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, one of the oxidation catalyst components, one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, more preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, more preferably and one of the further catalyst components which is a catalyzed soot filter (CSF), and / or, more preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, more preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst. According to a seventh alternative, it is preferred that the exhaust gas treatment system comprises in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, one of the oxidation catalyst components, one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, more preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, more preferably and one of the further catalyst components which is a catalyzed soot filter (CSF), and / or, more preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, more preferably and one of the further catalyst components which is an ammonia oxidation (AMOX) catalyst.

[0044] According to a eighth alternative, it is preferred that the exhaust gas treatment system comprises in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, one of the oxidation catalyst components, one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, more preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, an optional fuel injector, a further one of the oxidation catalyst components, wherein the first substrate is a wall-flow substrate, and / or, more preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, more preferably and one of the further catalyst components which is an ammonia oxidation (AMOX) catalyst.

[0045] According to a ninth alternative, it is preferred that the exhaust gas treatment system comprises in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, one of the oxidation catalyst components, one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, more preferably and one of the further catalyst components which is a selective catalytic reduction catalyst on filter (SCRoF), and / or, more preferably and one of the further catalyst components which is an ammonia oxidation (AMOX) catalyst.

[0046] According to a tenth alternative, it is preferred that the exhaust gas treatment system comprises in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, optionally a selective catalytic reduction (SCR) catalyst, an optional fuel injector, one of the oxidation catalyst components, one of the further catalyst components which is a selective catalytic reduction catalyst on filter (SCRoF), and / or, more preferably and one of the further catalyst components which is an ammonia oxidation (AMOX) catalyst.

[0047] According to a eleventh alternative, it is preferred that the exhaust gas treatment system comprises in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, optionally a selective catalytic reduction (SCR) catalyst, an optional fuel injector, one of the oxidation catalyst components, one of the further catalyst components which is a catalyzed soot filter (CSF), and / or, more preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, more preferably and one of the further catalyst components which is an ammonia oxidation (AMOX) catalyst.

[0048] According to a twelfth alternative, it is preferred that the exhaust gas treatment system comprises in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, optionally a selective catalytic reduction (SCR) catalyst, an optional fuel injector, one of the oxidation catalyst components, a further one of the oxidation catalyst components, wherein the first substrate is a wall-flow substrate, and / or, more preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, more preferably and one of the further catalyst components which is an ammonia oxidation (AMOX) catalyst.

[0049] According to a thirteenth alternative, it is preferred that the exhaust gas treatment system comprises in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, one of the oxidation catalyst components, a diesel particulate filter (DPF), one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, more preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, more preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, more preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, more preferably and one of the further catalyst components which is an ammonia oxidation (AMOX) catalyst.

[0050] According to a fourteenth alternative, it is preferred that the exhaust gas treatment system comprises in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, one of the oxidation catalyst components, one of the further catalyst components which is a selective catalytic reduction catalyst on filter (SCRoF), and / or, more preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, more preferably and one of the further catalyst components which is an ammonia oxidation (AMOX) catalyst.

[0051] According to a fifteenth alternative, it is preferred that the exhaust gas treatment system comprises in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, one of the oxidation catalyst components, one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, more preferably and one of the further catalyst components which is a selective catalytic reduction catalyst on filter (SCRoF), and / or, more preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, more preferably and one of the further catalyst components which is an ammonia oxidation (AMOX) catalyst.

[0052] It is preferred that, independently from one another, the one or more oxidation catalyst components are substantially free of Mn, wherein more preferably the one or more oxidation catalyst components are free of Mn. Within the meaning of the present invention, an oxidation catalyst component is substantially free of an element or compound(s) when the oxidation catalyst component contains said element or compound(s) in an amount of 1 wt.-% or less calculated as the element or compound(s) and based on 100 wt.-% of the oxidation catalyst component, preferably in an amount of 0.5 wt.-% or less, more preferably of 0.1 wt.-% or less, more preferably of 0.05 wt.-% or less, more preferably of 0.01 wt.-% or less, more preferably of 0.005 wt.-% or less, more preferably of 0.001 wt.-% or less. Alternatively, it is preferred that, independently from one another, the content of optional Mn, calculated as the element, in the first washcoat layer of the one or more oxidation catalyst components is in the range of from 1 to 50 wt.-% based on 100 wt.-% of the first washcoat layer, preferably from 2 to 30 wt.-%, more preferably from 5 to 20 wt.-%, more preferably from 8 to 12 wt.-%.

[0053] It is preferred that, independently from one another, optional Mn is present in the one or more oxidation catalyst components in the form of one or more cations of Mn, wherein Mn is more preferably contained in the first washcoat layer of the one or more oxidation catalyst components as one or more oxides, wherein Mn is more preferably contained in the first washcoat layer of the one or more oxidation catalyst components as one or more oxides of Mn(ll), Mn(lll), Mn(l l / l 11), and Mn(IV), more preferably as one or more oxides selected from the group consisting of MnO, Mn2O3, MnsC , MnC>2, and Mn(O)OH, and Mn-Zr mixed oxides, including mixtures of two or more thereof, wherein the Mn-Zr mixed oxides are preferably contained in the first washcoat layer of the one or more oxidation catalyst components as a solid solution.

[0054] It is preferred that, independently from one another, the first washcoat layer of the one or more oxidation catalyst components comprises a particulate support material, wherein optional Mn is supported on the particulate support material, wherein the particulate support material is more preferably selected from the group consisting of ZrC>2, AI2O3, SiC>2, TiC>2, La2O3-doped ZrC>2, CeO2-ZrC>2 mixed oxide, La2C>3-doped CeO2-ZrO2 mixed oxide, Nd2Os-doped CeO2-ZrO2 mixed oxide, Y2C>3-doped CeO2-ZrO2 mixed oxide, praseodymium oxide-doped CeO2-ZrO2 mixed oxide ZrC>2-doped AI2O3, ZrC>2-doped SiC>2, SiC>2-doped AI2O3, CUO-AI2O3 mixed oxide, and mixtures of two or more thereof, more preferably from the group consisting of ZrC>2, La2C>3-doped ZrC>2, CeO2-ZrC>2 mixed oxide, La2C>3-doped CeO2-ZrO2 mixed oxide, Nd2Os-doped CeO2-ZrO2 mixed oxide, Y2Os-doped CeO2-ZrO2 mixed oxide, P^Os-doped CeO2-ZrO2 mixed oxide, PreOn- doped CeO2-ZrC>2 mixed oxide, PrC>2-doped CeO2-ZrO2 mixed oxide, ZrC>2-doped AI2O3, ZrC>2- doped SiC>2, and mixtures of two or more thereof, more preferably from the group consisting of ZrC>2, La2C>3-doped ZrC>2, CeO2-ZrO2 mixed oxide, La2C>3-doped CeO2-ZrO2 mixed oxide, Nd20s- doped CeO2-ZrC>2 mixed oxide, Y2Os-doped CeO2-ZrO2 mixed oxide, P^Os-doped CeO2-ZrO2 mixed oxide, P^On-doped CeO2-ZrO2 mixed oxide, and mixtures of two or more thereof, wherein more preferably Mn is supported on particulate La2C>3-doped ZrC>2, wherein preferably ZrO2is doped with La20s in an amount ranging from 1 to 50 wt.% based on 100 wt.-% of ZrO2and La2C>3, preferably from 3 to 30 wt.-%, more preferably from 5 to 15 wt.-%, more preferably from 8 to 10 wt.-%.

[0055] It is preferred that, independently from one another, the first washcoat layer of the one or more oxidation catalyst components comprises Ce, wherein Ce is more preferably contained in the first washcoat layer of the one or more oxidation catalyst components as CeC>2 and / or Ce2Os.

[0056] In the case wherein the first washcoat layer of the one or more oxidation catalyst components comprises Ce, it is preferred that, independently from one another, the content of Ce, calculated as the element, in the first washcoat layer of the one or more oxidation catalyst components is in the range of from 1 to 50 wt.-% based on 100 wt.-% of the first washcoat layer, more preferably from 2 to 30 wt.-%, more preferably from 5 to 20 wt.-%, more preferably from 8 to 12 wt.-%.

[0057] Further in the case wherein the first washcoat layer of the one or more oxidation catalyst components comprises Ce, it is preferred that, independently from one another, Ce is supported on a particulate support material, wherein the particulate support material is more preferably selected from the group consisting of ZrC>2, AI2O3, SiC>2, TiC>2, La2O3-doped ZrC>2, CeO2-ZrO2 mixed oxide, La2C>3-doped CeO2-ZrO2 mixed oxide, Nd2Os-doped CeO2-ZrO2 mixed oxide, Y2O3- doped CeO2-ZrC>2 mixed oxide, praseodymium oxide-doped CeO2-ZrO2 mixed oxide, ZrC>2- doped AI2O3, ZrC>2-doped SiC>2, SiC>2-doped AI2O3, CUO-AI2O3 mixed oxide, and mixtures of two or more thereof, more preferably from the group consisting of ZrC>2, La2C>3-doped ZrC>2, CeC>2- ZrC>2 mixed oxide, La2C>3-doped CeO2-ZrO2 mixed oxide, Nd2Os-doped CeO2-ZrO2 mixed oxide, Y2C>3-doped CeO2-ZrO2 mixed oxide, P^Os-doped CeO2-ZrO2 mixed oxide, P^On-doped CeC>2- ZrC>2 mixed oxide, PrC>2-doped CeO2-ZrO2 mixed oxide, ZrC>2-doped AI2O3, ZrC>2-doped SiC>2, and mixtures of two or more thereof, more preferably from the group consisting of ZrC>2, La20s- doped ZrC>2, CeO2-ZrO2 mixed oxide, La2C>3-doped CeO2-ZrO2 mixed oxide, Nd2Os-doped CeO2-ZrC>2 mixed oxide, Y2Os-doped CeO2-ZrO2 mixed oxide, P^Os-doped CeO2-ZrO2 mixed oxide, PreOn-doped CeO2-ZrO2 mixed oxide, and mixtures of two or more thereof, wherein more preferably Ce is supported on particulate La2C>3-doped ZrC>2, wherein preferably ZrC>2 is doped with La20s in an amount ranging from 1 to 50 wt.% based on 100 wt.-% of ZrO2and La2C>3, preferably from 3 to 30 wt.-%, more preferably from 5 to 15 wt.-%, more preferably from 8 to 10 wt.-%.

[0058] It is preferred that, independently from one another, the first washcoat layer of the one or more oxidation catalyst components is substantially free of Ce, wherein more preferably the first washcoat layer of the one or more oxidation catalyst components is free of Ce.

[0059] Within the meaning of the present invention, a washcoat layer is substantially free of an element or compound(s) when the washcoat layer contains said element or compound(s) in an amount of 1 wt.-% or less calculated as the element or compound(s) and based on 100 wt.-% of the washcoat layer, preferably in an amount of 0.5 wt.-% or less, more preferably of 0.1 wt.-% or less, more preferably of 0.05 wt.-% or less, more preferably of 0.01 wt.-% or less, more preferably of 0.005 wt.-% or less, more preferably of 0.001 wt.-% or less.

[0060] In the case wherein the first washcoat layer of the one or more oxidation catalyst components is substantially free of Ce, it is preferred that, independently from one another, the one or more oxidation catalyst components are substantially free of Ce, wherein more preferably the one or more oxidation catalyst components are free of Ce.

[0061] It is preferred that, independently from one another, the first washcoat layer of the one or more oxidation catalyst components comprises Cu, wherein the first washcoat layer of the one or more oxidation catalyst components more preferably comprises CuO, CU2O, or CuO and CU2O, more preferably CuO.

[0062] In the case wherein the first washcoat layer of the one or more oxidation catalyst components comprises Cu, it is preferred that, independently from one another, the content of Cu, calculated as the element, in the first washcoat layer of the one or more oxidation catalyst components is in the range of from 1 to 50 wt.-% based on 100 wt.-% of the first washcoat layer, more preferably from 2 to 30 wt.-%, more preferably from 5 to 20 wt.-%, more preferably from 8 to 12 wt.-%.

[0063] Further in the case wherein the first washcoat layer of the one or more oxidation catalyst components comprises Cu, it is preferred that, independently from one another, Cu is supported on a particulate support material, wherein the particulate support material is more preferably selected from the group consisting of ZrC>2, AI2O3, SiC>2, TiC>2, La2O3-doped ZrC>2, CeO2-ZrO2 mixed oxide, La2C>3-doped CeO2-ZrO2 mixed oxide, Nd2Os-doped CeO2-ZrO2 mixed oxide, Y2O3- doped CeO2-ZrC>2 mixed oxide, praseodymium oxide-doped CeO2-ZrO2 mixed oxide ZrC>2- doped AI2O3, ZrC>2-doped SiC>2, SiC>2-doped AI2O3, CUO-AI2O3 mixed oxide, and mixtures of two or more thereof, more preferably from the group consisting of ZrC>2, La2C>3-doped ZrC>2, CeC>2- ZrO2mixed oxide, La2C>3-doped CeO2-ZrO2 mixed oxide, Nd2Os-doped CeO2-ZrO2 mixed oxide, Y2C>3-doped CeO2-ZrO2 mixed oxide, P^Os-doped CeO2-ZrO2 mixed oxide, P^On-doped CeC>2- ZrO2mixed oxide, PrC>2-doped CeO2-ZrO2 mixed oxide, ZrC>2-doped AI2O3, ZrC>2-doped SiC>2, and mixtures of two or more thereof, more preferably from the group consisting of ZrC>2, La20s- doped ZrC>2, CeO2-ZrO2 mixed oxide, La2C>3-doped CeO2-ZrO2 mixed oxide, Nd2Os-doped CeO2-ZrC>2 mixed oxide, Y2Os-doped CeO2-ZrO2 mixed oxide, P^Os-doped CeO2-ZrO2 mixed oxide, PreOn-doped CeO2-ZrO2 mixed oxide, and mixtures of two or more thereof, wherein more preferably Cu is supported on particulate La2C>3-doped ZrC>2, wherein preferably ZrO2is doped with La20s in an amount ranging from 1 to 50 wt.% based on 100 wt.-% of ZrO2and La2C>3, preferably from 3 to 30 wt.-%, more preferably from 5 to 15 wt.-%, more preferably from 8 to 10 wt.-%.

[0064] It is preferred that, independently from one another, the first washcoat layer of the one or more oxidation catalyst components is substantially free of Cu, wherein more preferably the first washcoat layer of the one or more oxidation catalyst components is free of Cu.

[0065] In the case wherein the first washcoat layer of the one or more oxidation catalyst components is substantially free of Cu, it is preferred that, independently from one another, the one or more oxidation catalyst components are substantially free of Cu, wherein more preferably the one or more oxidation catalyst components are free of Cu.

[0066] It is preferred that, independently from one another, the first substrate of the one or more oxidation catalyst components is a wall-flow substrate or a flow-through substrate, more preferably a honeycomb wall-flow substrate or a honeycomb flow-through substrate, more preferably a honeycomb flow-through substrate, wherein the flow-through substrate is more preferably a flow- through substrate with high porosity walls.

[0067] It is preferred that, independently from one another, the loading of the first washcoat layer of the one or more oxidation catalyst components is in the range of from 0.3 to 6 g / in3, more preferably of from 1 to 5 g / in3, more preferably of from 1.5 to 4 g / in3, more preferably of from 2 to 3.5 g / in3, more preferably of from 2.3 to 2.9 g / in3, more preferably of from 2.5 to 2.7 g / in3.

[0068] It is preferred that, independently from one another, the loading of the second washcoat layer of the one or more oxidation catalyst components is in the range of from 0.25 to 6 g / in3, more preferably of from 0.3 to 6 g / in3, more preferably of from 1 to 5 g / in3, more preferably of from 1.5 to 4 g / in3, more preferably of from 2 to 3.5 g / in3, more preferably of from 2.2 to 3.0 g / in3, more preferably of from 2.3 to 2.9 g / in3, more preferably of from 2.5 to 2.7 g / in3.

[0069] It is preferred that, independently from one another, the one or more oxidation catalyst components comprise one or more platinum group metals consisting of Pt, Pd, or Pt and Pd, wherein more preferably the one or more oxidation catalyst components comprise Pt, or Pt and Pd as the one or more platinum group metals, wherein more preferably the one or more oxidation catalyst components comprise Pt and Pd as the one or more platinum group metals.

[0070] It is preferred that, independently from one another, the one or more oxidation catalyst components comprise Pt, calculated as the element, at a loading in the range of from 2 to 250 g / ft3, more preferably of from 5 to 150 g / ft3, more preferably of from 10 to 125 g / ft3, more preferably of from 20 to 100 g / ft3, more preferably of from 25 to 85 g / ft3, more preferably of from 30 to 80 g / ft3, more preferably of from 40 to 60 g / ft3.

[0071] Within the meaning of the present invention, the loading of Pt, Pd, or Pt and Pd in the oxidation catalyst component refers to the loading of Pt, Pd, or Pt and Pd based on the volume of the oxidation catalyst component in which Pt, Pd, or Pt and Pd is contained. In the event that Pt, Pd, or Pt and Pd is contained in one or more zones of the oxidation catalyst component, it is preferred within the meaning of the present invention, that the loading of Pt, Pd, or Pt and Pd is based on the volume of the oxidation catalyst component in which the one or more Pt, Pd, or Pt and Pd zones are contained. Thus, by means of examples, if Pt, Pd, or Pt and Pd is provided in a zone extending over 50% of the axial length of a honeycomb substrate, its loading is calculated based on 50% of the total volume of the honeycomb substrate.

[0072] It is preferred that, independently from one another, the one or more oxidation catalyst components comprise Pd, calculated as the element, at a loading in the range of from 5 to 100 g / ft3, more preferably of from 5 to 60 g / ft3, more preferably of from 10 to 50 g / ft3, more preferably of from 15 to 40 g / ft3, more preferably of from 20 to 30 g / ft3.

[0073] It is preferred that, independently from one another, the one or more oxidation catalyst components comprise Pt and Pd, calculated as the respective element, at a total Pt and Pd loading in the range of from 2 to 250 g / ft3, more preferably of from 5 to 200 g / ft3, more preferably of from 10 to 150 g / ft3, more preferably of from 20 to 130 g / ft3, more preferably of from 30 to 125 g / ft3, more preferably of from 40 to 110 g / ft3, more preferably of from 50 to 100 g / ft3, more preferably of from 60 to 90 g / ft3, more preferably of from 70 to 80 g / ft3.

[0074] It is preferred that, independently from one another, the one or more oxidation catalyst components comprise Pt and Pd at a Pt : Pd weight ratio in the range of from 1 :2 to 20:1 , more preferably of from 50:50 to 80:20, more preferably of from 60:40 to 75:25, more preferably of from 65:35 to 70:30.

[0075] It is preferred that, independently from one another, the one or more platinum group metals are supported on a particulate support material, wherein the particulate support material is more preferably selected from the group consisting of AI2O3, SiC>2, TiC>2, SiC>2-doped AI2O3, Mn oxidedoped AI2O3, and mixtures of two or more thereof, wherein more preferably the one or more platinum group metals are supported on AI2O3 and / or SiC>2-doped AI2O3 and / or Mn oxide-doped AI2O3, more preferably SiC>2-doped AI2O3 or AI2O3 or Mn oxide-doped AI2O3, wherein the Mn ox- ide-doped AI2O3 more preferably comprises from 1 to 10 weight-%, more preferably from 4 to 6 weight-%, of Mn oxide, calculated as Mn oxide, based on 100 weight-% of the Mn oxide-doped AI2O3.

[0076] It is preferred that, independently from one another, the first washcoat layer of the one or more oxidation catalyst components comprises a hydrocarbon trap material, wherein the hydrocarbon trap material comprises a molecular sieve, more preferably a zeolite, more preferably a zeolite having a maximum pore size of 12-membered rings, more preferably zeolite beta, wherein the molecular sieve, more preferably the zeolite, more preferably comprises SiC>2 and AI2O3, wherein the molecular sieve, more preferably the zeolite, more preferably has a molar ratio of SiC>2 to AI2O3 in the range of from 10:1 to 500:1 , more preferably of from 10:1 to 100:1 , more preferably of from 10:1 to 40:1 , more preferably of from 15:1 to 30:1 , more preferably of from 20:1 to 25:1 , wherein the molecular sieve, more preferably the zeolite, more preferably comprises Fe, wherein the molecular sieve, more preferably the zeolite, more preferably comprises Fe, calculated as Fe20s, in an amount in the range of from 1 .0 to 7.0 weight-%, more preferably of from 3.0 to 5.0 weight-%, more preferably of from 4.0 to 4.5 weight-%, based on the weight of the molecular sieve.

[0077] In the case wherein the first washcoat layer of the one or more oxidation catalyst components comprises a hydrocarbon trap material, wherein the hydrocarbon trap material comprises a molecular sieve, it is preferred that, independently from one another, the loading of the hydrocarbon trap material in the first washcoat layer of the one or more oxidation catalyst components is in the range of from 0.01 to 2.0 g / in3, more preferably in the range of from 0.05 to 1 .0 g / in3, more preferably in the range of from 0.05 to 0.3 g / in3.

[0078] It is preferred that, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer, wherein the one or more platinum group metals are at least in part contained in the second washcoat layer of the one or more oxidation catalyst components, wherein more preferably the one or more platinum group metals are entirely contained in the second washcoat layer of the one or more oxidation catalyst components.

[0079] It is preferred that, independently from one another, the second washcoat layer of the one or more oxidation catalyst components comprises a hydrocarbon trap material, wherein the hydrocarbon trap material comprises a molecular sieve, preferably a zeolite, more preferably a zeolite having a maximum pore size defined by 12-membered rings, more preferably zeolite beta, wherein the molecular sieve, preferably the zeolite, preferably comprises SiC>2 and AI2O3, wherein the molecular sieve, preferably the zeolite, more preferably has a molar ratio of SiC>2 to AI2O3 in the range of from 10:1 to 40:1 , more preferably of from 15:1 to 30:1 , more preferably of from 20:1 to 25:1 , wherein the molecular sieve, preferably the zeolite, preferably comprises Fe, wherein the molecular sieve, preferably the zeolite, more preferably comprises Fe, calculated as Fe2C>3, in an amount in the range of from 1 .0 to 7.0 weight-%, more preferably of from 3.0 to 5.0 weight-%, more preferably of from 4.0 to 4.5 weight-%, based on the weight of the molecular sieve.

[0080] In the case wherein the second washcoat layer of the one or more oxidation catalyst components comprises a hydrocarbon trap material, wherein the hydrocarbon trap material comprises a molecular sieve, it is preferred that, independently from one another, the loading of the hydrocarbon trap material in the second washcoat layer of the one or more oxidation catalyst components is in the range of from 0.01 to 2.0 g / in3, more preferably in the range of from 0.05 to 1 .0 g / in3g / in3, more preferably in the range of from 0.05 to 0.3 g / in3.

[0081] It is preferred that, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer.

[0082] In the case wherein, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer, it is preferred according to a first alternative with respect to the configuration of washcoat layers that, independently from one another, the one or more oxidation catalyst components display a layered arrangement of the first and second washcoat layers, and wherein the one or more platinum group metals are at least in part contained in the second washcoat layer of the one or more oxidation catalyst components.

[0083] In accordance with the first alternative, it is preferred as an alternative that, independently from one another, the first washcoat layer of the one or more oxidation catalyst components is provided on the first substrate, and the second washcoat layer is provided on the first washcoat layer. Further in accordance with the first alternative, it is preferred as a further alternative that, independently from one another, the second washcoat layer of the one or more oxidation catalyst components is provided on the first substrate, and the first washcoat layer is provided on the second washcoat layer.

[0084] Further in accordance with the first alternative, it is preferred as a further alternative that, independently from one another, the one or more oxidation catalyst components comprise a third washcoat layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the first, second, and third washcoat layers, wherein the third washcoat layer is provided on the first substrate along its axial length starting from the inlet end of the first substrate and wherein the first washcoat layer is provided on the first substrate along its axial length starting from the outlet end of the first substrate, and wherein the second washcoat layer is provided on and entirely covers the first washcoat layer, wherein the length of the first washcoat layer is less than the axial length of the first substrate such as to create an upstream zone comprising the third washcoat layer and a downstream zone comprising the first and second washcoat layers, and wherein the one or more platinum group metals are at least in part contained in the third washcoat layer.

[0085] Further in accordance with the first alternative, it is preferred as a further alternative that, independently from one another, the one or more oxidation catalyst components comprise a third washcoat layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the first, second, and third washcoat layers, wherein the third washcoat layer is provided on the first substrate along its axial length starting from the inlet end of the first substrate and wherein the second washcoat layer is provided on the first substrate along its axial length starting from the outlet end of the first substrate, and wherein the first washcoat layer is provided on and entirely covers the second washcoat layer, wherein the length of the second washcoat layer is less than the axial length of the first substrate such as to create an upstream zone comprising the third washcoat layer and a downstream zone comprising the first and second washcoat layers, and wherein the one or more platinum group metals are at least in part contained in the third washcoat layer.

[0086] Further in accordance with the first alternative, it is preferred as a further alternative that, independently from one another, the one or more oxidation catalyst components comprise a third washcoat layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the first, second, and third washcoat layers, wherein the third washcoat layer is provided on the first substrate along its axial length starting from the outlet end of the first substrate and wherein the first washcoat layer is provided on the first substrate along its axial length starting from the inlet end of the first substrate, and wherein the second washcoat layer is provided on and entirely covers the first washcoat layer, wherein the length of the first washcoat layer is less than the axial length of the first substrate such as to create a downstream zone comprising the third washcoat layer and an upstream zone comprising the first and second washcoat layers, and wherein the one or more platinum group metals are at least in part contained in the third washcoat layer.

[0087] Further in accordance with the first alternative, it is preferred as a further alternative that, independently from one another, the one or more oxidation catalyst components comprise a third washcoat layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the first, second, and third washcoat layers, wherein the third washcoat layer is provided on the first substrate along its axial length starting from the outlet end of the first substrate and wherein the second washcoat layer is provided on the first substrate along its axial length starting from the inlet end of the first substrate, and wherein the first washcoat layer is provided on and entirely covers the second washcoat layer, wherein the length of the second washcoat layer is less than the axial length of the first substrate such as to create a downstream zone comprising the third washcoat layer and an upstream zone comprising the first and second washcoat layers, and wherein the one or more platinum group metals are at least in part contained in the third washcoat layer.

[0088] In the case wherein, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer, it is preferred according to a second alternative with respect to the configuration of washcoat layers that, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the first and second washcoat layers, wherein the second washcoat layer is provided on the first substrate along its axial length starting from the inlet end of the first substrate, and wherein the first washcoat layer is provided on the first substrate along its axial length starting from the outlet end of the first substrate, wherein the length of the first washcoat layer is less than the axial length of the first substrate such as to create an upstream zone comprising the second washcoat layer and a downstream zone comprising the first washcoat layer, and wherein the one or more platinum group metals are at least in part contained in the second washcoat layer.

[0089] In the case wherein, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer, it is preferred according to a third alternative with respect to the configuration of washcoat layers that, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the first and second washcoat layers, wherein the first washcoat layer is provided on the first substrate along its axial length starting from the inlet end of the first substrate, and wherein the second washcoat layer is provided on the first substrate along its axial length starting from the outlet end of the first substrate, wherein the length of the first washcoat layer is less than the axial length of the first substrate such as to create an upstream zone comprising the first washcoat layer and a downstream zone comprising the second washcoat layer, and wherein the one or more platinum group metals are at least in part contained in the second washcoat layer. In the case wherein, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer, it is preferred according to a fourth alternative with respect to the configuration of washcoat layers that, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the first and second washcoat layers, wherein the second washcoat layer is provided on the first substrate along its axial length starting from the inlet end of the first substrate, and wherein the first washcoat layer is provided on the first substrate along its axial length starting from the outlet end of the first substrate, wherein the length of the second washcoat layer is less than the axial length of the first substrate such as to create an upstream zone comprising the second washcoat layer and a downstream zone comprising the first washcoat layer, and wherein the one or more platinum group metals are at least in part contained in the second washcoat layer.

[0090] In the case wherein, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer, it is preferred according to a fifth alternative with respect to the configuration of washcoat layers that, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the first and second washcoat layers, wherein the first washcoat layer is provided on the first substrate along its axial length starting from the inlet end of the first substrate, and wherein the second washcoat layer is provided on the first substrate along its axial length starting from the outlet end of the first substrate, wherein the length of the second washcoat layer is less than the axial length of the first substrate such as to create an upstream zone comprising the first washcoat layer and a downstream zone comprising the second washcoat layer, and wherein the one or more platinum group metals are at least in part contained in the second washcoat layer.

[0091] In the case wherein, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the first and second washcoat layers, wherein the second washcoat layer is provided on the first substrate along its axial length starting from the inlet end of the first substrate, and wherein the first washcoat layer is provided on the first substrate along its axial length starting from the outlet end of the first substrate, it is preferred that, independently from one another, the one or more oxidation catalyst components comprise a third washcoat layer, wherein the third washcoat layer is provided on the first layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the second and third washcoat layers, wherein the second washcoat layer is provided on the first substrate along the axial length of the first substrate starting from the inlet end of the first substrate, and wherein the third washcoat layer is provided on the first washcoat layer along the axial length of the first substrate starting from the outlet end of the first substrate, wherein the length of the third washcoat layer is less than the axial length of the first substrate such as to create an upstream zone comprising the second washcoat layer and a downstream zone comprising the first and third washcoat layers. In the case wherein, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the first and second washcoat layers, wherein the first washcoat layer is provided on the first substrate along its axial length starting from the inlet end of the first substrate, and wherein the second washcoat layer is provided on the first substrate along its axial length starting from the outlet end of the first substrate, it is preferred that, independently from one another, the one or more oxidation catalyst components comprise a third washcoat layer, wherein the third washcoat layer is provided on the first layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the second and third washcoat layers, wherein the third washcoat layer is provided on the first washcoat layer along the axial length of the first substrate starting from the inlet end of the first substrate, and wherein the second washcoat layer is provided on the first substrate along the axial length of the first substrate starting from the outlet end of the first substrate, wherein the length of the third washcoat layer is less than the axial length of the first substrate such as to create an upstream zone comprising the first and third washcoat layers and a downstream zone comprising the second washcoat layer.

[0092] In the case wherein, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer, it is preferred that the first and second washcoat layers are adjacent to one another.

[0093] Further in the case wherein, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer, it is preferred that the second and third washcoat layers are adjacent to one another.

[0094] Further in the case wherein, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer, it is preferred that a portion of the second washcoat layer overlaps at least a portion of the first washcoat layer, wherein more preferably the second washcoat layer overlaps the first washcoat layer over a portion ranging from 10 to 100% of the axial length of the first washcoat layer, more preferably from 15 to 80%, and more preferably from 20 to 50%.

[0095] Further in the case wherein, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer, it is preferred that a portion of the first washcoat layer overlaps at least a portion of the second washcoat layer, wherein more preferably the first washcoat layer overlaps the second washcoat layer over a portion ranging from 10 to 100% of the axial length of the second washcoat layer, more preferably from 15 to 80%, and more preferably from 20 to 50%.

[0096] Further in the case wherein, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer and a third washcoat layer, it is preferred that a portion of the third washcoat layer overlaps at least a portion of the first washcoat layer, wherein more preferably the third washcoat layer overlaps the first washcoat layer over a portion ranging from 10 to 100% of the axial length of the first washcoat layer, more preferably from 15 to 80%, and more preferably from 20 to 50%.

[0097] In the case wherein, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer, it is preferred according to a sixth alternative with respect to the configuration of washcoat layers that, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the first and second washcoat layers, wherein the second washcoat layer is provided on the first substrate along its entire length, and wherein the first washcoat layer is provided on the second washcoat layer along its axial length starting from the outlet end of the first substrate, wherein the length of the first washcoat layer is less than the axial length of the first substrate such as to create an upstream zone comprising the second washcoat layer and a downstream zone comprising the first washcoat layer over the second washcoat layer, and wherein the one or more platinum group metals are at least in part contained in the second washcoat layer.

[0098] In the case wherein, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer, it is preferred according to a seventh alternative with respect to the configuration of washcoat layers that, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the first and second washcoat layers, wherein the second washcoat layer is provided on the first substrate along its entire length, and wherein the first washcoat layer is provided on the second washcoat layer along its axial length starting from the inlet end of the first substrate, wherein the length of the first washcoat layer is less than the axial length of the first substrate such as to create an upstream zone comprising the first washcoat layer over the second washcoat layer and a downstream zone comprising the second washcoat layer, and wherein the one or more platinum group metals are at least in part contained in the second washcoat layer.

[0099] In the case wherein, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer according to the sixth or seventh alternative, it is preferred that the length of the first washcoat layer ranges from 10 to 90% of the axial length of the first substrate, more preferably from 30 to 80%, and more preferably from 50 to 70%.

[0100] In the case wherein, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer, it is preferred according to an eighth alternative with respect to the configuration of washcoat layers that, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the first and second washcoat layers, wherein the first washcoat layer is provided on the first substrate along its entire length, and wherein the second washcoat layer is provided on the first washcoat layer along its axial length starting from the inlet end of the first substrate, wherein the length of the second washcoat layer is less than the axial length of the first substrate such as to create an upstream zone comprising the second washcoat layer over the first washcoat layer and a downstream zone comprising the first washcoat layer, and wherein the one or more platinum group metals are at least in part contained in the second washcoat layer.

[0101] In the case wherein, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer according to the eighth alternative with respect to the configuration of washcoat layers, it is preferred that, independently from one another, the one or more oxidation catalyst components comprise a third washcoat layer, wherein the third washcoat layer is provided on the first layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the second and third washcoat layers, wherein the second washcoat layer is provided on the first washcoat layer along the axial length of the first substrate starting from the inlet end of the first substrate, and wherein the third washcoat layer is provided on the first washcoat layer along the axial length of the first substrate starting from the outlet end of the first substrate, wherein the length of the third washcoat layer is less than the axial length of the first substrate such as to create an upstream zone comprising the second washcoat layer and a downstream zone comprising the third washcoat layer.

[0102] In the case wherein, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer, it is preferred according to a ninth alternative with respect to the configuration of washcoat layers that, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the first and second washcoat layers, wherein the first washcoat layer is provided on the first substrate along its entire length, and wherein the second washcoat layer is provided on the first washcoat layer along its axial length starting from the outlet end of the first substrate, wherein the length of the second washcoat layer is less than the axial length of the first substrate such as to create an upstream zone comprising the first washcoat layer and a downstream zone comprising the second washcoat layer over the first washcoat layer, and wherein the one or more platinum group metals are at least in part contained in the second washcoat layer.

[0103] In the case wherein, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer according to the ninth alternative with respect to the configuration of washcoat layers, it is preferred that, independently from one another, the one or more oxidation catalyst components comprise a third washcoat layer, wherein the third washcoat layer is provided on the first layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the second and third washcoat layers, wherein the third washcoat layer is provided on the first washcoat layer along the axial length of the first substrate starting from the inlet end of the first substrate, and wherein the second washcoat layer is provided on the first washcoat layer along the axial length of the first substrate starting from the outlet end of the first substrate, wherein the length of the third washcoat layer is less than the axial length of the first substrate such as to create an upstream zone comprising the third washcoat layer and a downstream zone comprising the second washcoat layer.

[0104] In the case wherein, independently from one another, the one or more oxidation catalyst components comprise second and third washcoat layer according to the eighth or ninth alternative with respect to the configuration of washcoat layers, it is preferred that, the second and third washcoat layers are adjacent to one another.

[0105] In the case wherein, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer, it is preferred according to a tenth alternative with respect to the configuration of washcoat layers that, independently from one another, the length of the first washcoat layer of the one or more oxidation catalyst components ranges from 5 to 100% of the axial length of the first substrate, more preferably from 10 to 90% of the axial length of the first substrate, more preferably from 15 to 75%, more preferably from 20 to 60%, more preferably from 25 to 50%, and more preferably from 35 to 45%.

[0106] In the case wherein, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer, it is preferred that, independently from one another, the length of the second washcoat layer ranges from 5 to 100% of the axial length of the first substrate, more preferably from 10 to 90% of the axial length of the first substrate, more preferably from 15 to 75%, more preferably from 20 to 60%, more preferably from 25 to 50%, and more preferably from 35 to 45%.

[0107] In the case wherein, independently from one another, the one or more oxidation catalyst components comprise second and third washcoat layers, it is preferred that, independently from one another, the length of the third washcoat layer ranges from 5 to 100% of the axial length of the first substrate, more preferably from 10 to 90% of the axial length of the first substrate, more preferably from 15 to 75%, more preferably from 20 to 60%, more preferably from 25 to 50%, and more preferably from 35 to 45%.

[0108] Further in the case wherein, independently from one another, the one or more oxidation catalyst components comprise second and third washcoat layers, it is preferred that, independently from one another, the third washcoat layer comprises a hydrocarbon trap material, wherein the hydrocarbon trap material comprises a molecular sieve, more preferably a zeolite, more preferably a zeolite having a maximum pore size of 12-membered rings, more preferably zeolite beta, wherein the molecular sieve, more preferably the zeolite, more preferably comprises SiC>2 and AI2O3, wherein the molecular sieve, more preferably the zeolite, more preferably has a molar ratio of SiC>2 to ALOs in the range of from 10:1 to 500:1 , more preferably of from 10:1 to 100:1 , more preferably of from 10:1 to 40:1 , more preferably of from 15:1 to 30:1 , more preferably of from 20:1 to 25:1 , wherein the molecular sieve, more preferably the zeolite, more preferably comprises Fe, wherein the molecular sieve, more preferably the zeolite, more preferably comprises Fe, calculated as Fe20s, in an amount in the range of from 1 .0 to 7.0 weight-%, more preferably of from 3.0 to 5.0 weight-%, more preferably of from 4.0 to 4.5 weight-%, based on the weight of the molecular sieve.

[0109] In the case wherein, independently from one another, the one or more oxidation catalyst components comprise second and third washcoat layers, and wherein, independently from one another, the third washcoat layer comprises a hydrocarbon trap material, it is preferred that the loading of the hydrocarbon trap material in the third washcoat layer is in the range of from 0.01 to 2.0 g / in3, more preferably in the range of from 0.05 to 1 .0 g / in3, more preferably in the range of from 0.05 to 0.3 g / in3.

[0110] In the case wherein, independently from one another, the one or more oxidation catalyst components comprise second and third washcoat layers, it is preferred that the one or more platinum group metals are at least in part contained in the third washcoat layer.

[0111] In the case wherein, independently from one another, the one or more oxidation catalyst components comprise second and third washcoat layers, and wherein the one or more platinum group metals are at least in part contained in the third washcoat layer, it is preferred that the one or more platinum group metals are supported on a particulate support material, wherein the particulate support material is more preferably selected from the group consisting of AI2O3, SiC>2, TiC>2, SiC>2-doped AI2O3, Mn oxide-doped AI2O3, and mixtures of two or more thereof, wherein more preferably the one or more platinum group metals are supported on AI2O3 and / or SiC>2- doped AI2O3 and / or Mn oxide-doped AI2O3, more preferably SiC>2-doped AI2O3 or AI2O3 or Mn oxide-doped AI2O3, wherein the Mn oxide-doped AI2O3 more preferably comprises from 1 to 10 weight-%, more preferably from 4 to 6 weight-%, of Mn oxide, calculated as MnC>2, based on 100 weight-% of the Mn oxide-doped AI2O3.

[0112] Further in the case wherein, independently from one another, the one or more oxidation catalyst components comprise second and third washcoat layers, it is preferred that, independently from one another, the one or more platinum group metals are entirely contained in the second and third washcoat layers, wherein the weight ratio of the one or more platinum group metals comprised in the second washcoat layer to the one or more platinum group metals comprised in the third washcoat layer is in the range of from 0.5:1 to 5.0:1 , more preferably 1.0:1 to 2.0:1 , more preferably in the range of from 1.4:1 to 1.6:1 , wherein the one or more platinum group metals comprised in the second washcoat layer preferably comprise, more preferably consist of, Pt and Pd, wherein the one or more platinum group metals comprised in the third washcoat layer preferably comprise, more preferably consist of, Pt and Pd. Further in the case wherein, independently from one another, the one or more oxidation catalyst components comprise second and third washcoat layers, it is preferred that, independently from one another, the loading of optional Mn, calculated as the element, in the zone of the one or more oxidation catalyst components containing the first washcoat layer is in the range of from 0.04 to 0.9 g / in3, based on the volume of the zone of the catalyst containing the first washcoat layer, more preferably of from 0.05 to 0.8 g / in3, more preferably of from 0.15 to 0.5 g / in3, more preferably of from 0.2 to 0.35 g / in3, more preferably of from 0.23 to 0.29 g / in3, more preferably of from 0.25 to 0.27 g / in3.

[0113] In the case wherein, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer or second and third washcoat layers, it is preferred that, independently from one another, the one or more platinum group metals are entirely contained in the second washcoat layer or in the second and third washcoat layers.

[0114] Further in the case wherein, independently from one another, the one or more oxidation catalyst components comprise a second washcoat layer or second and third washcoat layers, it is preferred that, independently from one another, the one or more platinum group metals are at least in part contained in the first washcoat layer.

[0115] It is preferred that, independently from one another, the first substrate of the one or more oxidation catalyst components is a metallic first substrate or a ceramic first substrate, wherein more preferably the first substrate is a ceramic first substrate, wherein more preferably the first substrate comprises cordierite and / or SiC, more preferably cordierite, wherein more preferably, the first substrate consists of cordierite and / or SiC, more preferably of cordierite.

[0116] It is preferred that the exhaust gas stream contains hydrocarbons, preferably C1 to C20 hydrocarbons, more preferably C2 to C10 hydrocarbons.

[0117] The present invention is further illustrated by the following set of embodiments and combinations of embodiments resulting from the dependencies and back-references as indicated. In particular, it is noted that in each instance where a range of embodiments is mentioned, for example in the context of a term such as "The exhaust gas treatment system of any one of embodiments 1 to 4", every embodiment in this range is meant to be explicitly disclosed for the skilled person, i.e. the wording of this term is to be understood by the skilled person as being synonymous to "The exhaust gas treatment system of any one of embodiments 1 , 2, 3, and 4". Further, it is explicitly noted that the following set of embodiments represents a suitably structured part of the general description directed to preferred aspects of the present invention, and, thus, suitably supports, but does not represent the claims of the present invention. 1 . Exhaust gas treatment system comprising an internal combustion engine and an exhaust gas conduit for exhaust gas from the internal combustion engine, wherein the exhaust gas conduit comprises one or more oxidation catalyst components and one or more further catalyst components, wherein independently from one another, the one or more oxidation catalyst components comprise a first washcoat layer, wherein the first washcoat layer optionally comprises Mn, and a first substrate, wherein the first substrate has an inlet end through which the exhaust gas stream may enter the oxidation catalyst component, and an outlet end through which the exhaust gas stream may exit the oxidation catalyst component, wherein the oxidation catalyst component comprises one or more platinum group metals comprising Pt, Pd, or Pt and Pd, wherein the one or more platinum group metals are at least in part contained in one or more of:

[0118] (a) the first washcoat layer, and

[0119] (b) an optional second washcoat layer, or

[0120] (c) optional second and third washcoat layers; and wherein independently from one another, the one or more further catalyst components comprise a catalyst component washcoat layer comprising Mn, and a catalyst component substrate, wherein the catalyst component substrate has an inlet end through which the exhaust gas stream may enter the further catalyst component, and an outlet end through which the exhaust gas stream may exit the further catalyst component.

[0121] 2. The exhaust gas treatment system of embodiment 1 , wherein independently from one another, the one or more further catalyst components are selected from the group consisting of a selective catalytic reduction (SCR) catalyst, an ammonia oxidation (AMOX) catalyst, a catalyzed soot filter (CSF), a selective catalytic reduction catalyst on filter (SCRoF), and a diesel exotherm catalyst (DEC).

[0122] 3. The exhaust gas treatment system of embodiment 1 or 2, wherein independently from one another, the content of Mn, calculated as the element, in the catalyst component washcoat layer of the one or more further catalyst components is in the range of from 1 to 50 wt.-% based on 100 wt.-% of the catalyst component washcoat layer, preferably of from 2 to 35 wt.-%, more preferably of from 3 to 25 wt.-%, more preferably of from 4 to 15 wt.-%, more preferably of from 5 to 10 wt.-%.

[0123] 4. The exhaust gas treatment system of any of embodiments 1 to 3, wherein independently from one another, Mn is present in the catalyst component washcoat layer of the one or more further catalyst components in the form of one or more cations of Mn, wherein Mn is preferably contained in the catalyst component washcoat layer as one or more oxides, wherein Mn is more preferably contained in the catalyst component washcoat layer as one or more oxides of Mn(ll), Mn(lll), M n(l l / l 11), and Mn(IV), more preferably as one or more oxides selected from the group consisting of MnO, Mn2O3, MnsC , MnO2, and Mn(O)OH, and Mn-Zr mixed oxides, including mixtures of two or more thereof, wherein the Mn-Zr mixed oxides are preferably contained in the catalyst component washcoat layer as a solid solution. The exhaust gas treatment system of any of embodiments 1 to 4, wherein independently from one another, the catalyst component washcoat layer of the one or more further catalyst components comprises a particulate support material, wherein Mn is supported on the particulate support material, wherein the particulate support material is preferably selected from the group consisting of ZrO2, AI2O3, SiC>2, TiC>2, La2O3-doped ZrO2, CeO2-ZrO2 mixed oxide, La2O3-doped CeO2-ZrO2 mixed oxide, Nd2O3-doped CeO2-ZrO2 mixed oxide, Y2O3- doped CeO2-ZrC>2 mixed oxide, praseodymium oxide-doped CeO2-ZrO2 mixed oxide ZrO2- doped AI2O3, ZrO2-doped SiC>2, SiO2-doped AI2O3, CUO-AI2O3 mixed oxide, and mixtures of two or more thereof, more preferably from the group consisting of ZrO2, La2O3-doped ZrO2, CeO2-ZrC>2 mixed oxide, La2O3-doped CeO2-ZrO2 mixed oxide, Nd2O3-doped CeO2- ZrO2mixed oxide, Y2O3-doped CeO2-ZrO2 mixed oxide, Pr2O3-doped CeO2-ZrO2 mixed oxide, PreOn-doped CeO2-ZrO2 mixed oxide, PrO2-doped CeO2-ZrO2 mixed oxide, ZrO2- doped AI2O3, ZrO2-doped SiC>2, and mixtures of two or more thereof, more preferably from the group consisting of ZrO2, La2O3-doped ZrO2, CeO2-ZrO2 mixed oxide, La2O3-doped CeO2-ZrC>2 mixed oxide, Nd2O3-doped CeO2-ZrO2 mixed oxide, Y2O3-doped CeO2-ZrO2 mixed oxide, P^Os-doped CeO2-ZrO2 mixed oxide, P^On-doped CeO2-ZrO2 mixed oxide, and mixtures of two or more thereof, wherein more preferably Mn is supported on particulate La2O3-doped ZrO2, wherein preferably ZrO2is doped with La2O3 in an amount ranging from 1 to 50 wt.% based on 100 wt.-% of ZrO2and La2O3, preferably from 3 to 30 wt.-%, more preferably from 5 to 15 wt.-%, more preferably from 8 to 10 wt.-%. The exhaust gas treatment system of any of embodiments 1 to 5, wherein independently from one another, the catalyst component substrate of the one or more further catalyst components is a wall-flow substrate or a flow-through substrate, preferably a honeycomb wall-flow substrate or a honeycomb flow-through substrate, more preferably a honeycomb flow-through substrate, wherein the flow-through substrate is more preferably a flow- through substrate with high porosity walls. The exhaust gas treatment system of any of embodiments 1 to 6, wherein independently from one another, the loading of the catalyst component washcoat layer of the one or more further catalyst components is in the range of from 0.5 to 6 g / in3, preferably of from 0.7 to 4.5 g / in3, more preferably of from 0.9 to 3.0 g / in3, more preferably of from 1 .0 to 2.5 g / in3. 8. The exhaust gas treatment system of any of embodiments 1 to 7, wherein the internal combustion engine is a compression ignition engine, preferably a diesel engine.

[0124] 9. The exhaust gas treatment system of any of embodiments 1 to 7, wherein the internal combustion engine is a lean gasoline engine.

[0125] 10. The exhaust gas treatment system of embodiment 9, wherein the internal combustion engine is powered by an oxygenated fuel, wherein the oxygenated fuel preferably comprises one or more of methanol and biofuel.

[0126] 11 . The exhaust gas treatment system of any of embodiments 1 to 10, wherein the system further comprises one or more of an electric heater, a fuel burner, and a fuel injector.

[0127] 12. The exhaust gas treatment system of any of embodiments 1 to 11 , comprising in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, one or more of the oxidation catalyst components, and one or more of the further catalyst components.

[0128] 13. The exhaust gas treatment system of any of embodiments 1 to 12, comprising in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, one of the oxidation catalyst components, one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, preferably and an optional fuel injector and one of the further catalyst components which is a diesel exotherm catalyst (DEC), and / or, preferably and one of the further catalyst components which is a catalyzed soot filter (CSF), and / or, preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst.

[0129] 14. The exhaust gas treatment system of any of embodiments 1 to 12, comprising in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, one of the oxidation catalyst components, a further one of the oxidation catalyst components, one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, preferably and an optional fuel injector and one of the further catalyst components which is a diesel exotherm catalyst (DEC), a diesel particulate filter (DPF), and / or, preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst. The exhaust gas treatment system of any of embodiments 1 to 12, comprising in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, one of the oxidation catalyst components, a further one of the oxidation catalyst components, one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, preferably and an optional fuel injector and one of the further catalyst components which is a diesel exotherm catalyst (DEC), a diesel particulate filter (DPF), and / or, preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, preferably and one of the further catalyst components which is an ammonia oxidation (AMOX) catalyst. The exhaust gas treatment system of any of embodiments 1 to 12, comprising in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, one of the oxidation catalyst components, a further one of the oxidation catalyst components, one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, an optional fuel injector, a further one of the oxidation catalyst components, a diesel particulate filter (DPF), and / or, preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst. The exhaust gas treatment system of any of embodiments 1 to 12, comprising in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, one of the oxidation catalyst components, a further one of the oxidation catalyst components, one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, an optional fuel injector, a further one of the oxidation catalyst components, a further one of the oxidation catalyst components, wherein the first substrate is a wallflow substrate, and / or, preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, preferably and one of the further catalyst components which is an ammonia oxidation (AMOX) catalyst. The exhaust gas treatment system of any of embodiments 1 to 12, comprising in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, one of the oxidation catalyst components, one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, preferably and one of the further catalyst components which is a catalyzed soot filter (CSF), and / or, preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst. The exhaust gas treatment system of any of embodiments 1 to 12, comprising in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, one of the oxidation catalyst components, one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, preferably and one of the further catalyst components which is a catalyzed soot filter (CSF), and / or, preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, preferably and one of the further catalyst components which is an ammonia oxidation (AMOX) catalyst. The exhaust gas treatment system of any of embodiments 1 to 12, comprising in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, one of the oxidation catalyst components, one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, an optional fuel injector, a further one of the oxidation catalyst components, wherein the first substrate is a wallflow substrate, and / or, preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, preferably and one of the further catalyst components which is an ammonia oxidation (AMOX) catalyst. The exhaust gas treatment system of any of embodiments 1 to 12, comprising in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, one of the oxidation catalyst components, one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, preferably and one of the further catalyst components which is a selective catalytic reduction catalyst on filter (SCRoF), and / or, preferably and one of the further catalyst components which is an ammonia oxidation (AMOX) catalyst. The exhaust gas treatment system of any of embodiments 1 to 12, comprising in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, optionally a selective catalytic reduction (SCR) catalyst, an optional fuel injector, one of the oxidation catalyst components, one of the further catalyst components which is a selective catalytic reduction catalyst on filter (SCRoF), and / or, preferably and one of the further catalyst components which is an ammonia oxidation (AMOX) catalyst. The exhaust gas treatment system of any of embodiments 1 to 12, comprising in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, optionally a selective catalytic reduction (SCR) catalyst, an optional fuel injector, one of the oxidation catalyst components, one of the further catalyst components which is a catalyzed soot filter (CSF), and / or, preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, preferably and one of the further catalyst components which is an ammonia oxidation (AMOX) catalyst. The exhaust gas treatment system of any of embodiments 1 to 12, comprising in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, optionally a selective catalytic reduction (SCR) catalyst, an optional fuel injector, one of the oxidation catalyst components, a further one of the oxidation catalyst components, wherein the first substrate is a wallflow substrate, and / or, preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, preferably and one of the further catalyst components which is an ammonia oxidation (AMOX) catalyst. The exhaust gas treatment system of any of embodiments 1 to 12, comprising in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, one of the oxidation catalyst components, a diesel particulate filter (DPF), one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, preferably and one of the further catalyst components which is an ammonia oxidation (AMOX) catalyst. The exhaust gas treatment system of any of embodiments 1 to 12, comprising in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, one of the oxidation catalyst components, one of the further catalyst components which is a selective catalytic reduction catalyst on filter (SCRoF), and / or, preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, preferably and one of the further catalyst components which is an ammonia oxidation (AMOX) catalyst. The exhaust gas treatment system of any of embodiments 1 to 12, comprising in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, one of the oxidation catalyst components, one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, preferably and one of the further catalyst components which is a selective catalytic reduction catalyst on filter (SCRoF), and / or, preferably and one of the further catalyst components which is a selective catalytic reduction (SCR) catalyst, and / or, preferably and one of the further catalyst components which is an ammonia oxidation (AMOX) catalyst. The exhaust gas treatment system of any of embodiments 1 to 27, wherein independently from one another the one or more oxidation catalyst components are substantially free of Mn, wherein preferably the one or more oxidation catalyst components are free of Mn. The exhaust gas treatment system of any of embodiments 1 to 27, wherein independently from one another the content of optional Mn, calculated as the element, in the first washcoat layer of the one or more oxidation catalyst components is in the range of from 1 to 50 wt.-% based on 100 wt.-% of the first washcoat layer, preferably from 2 to 30 wt.-%, more preferably from 5 to 20 wt.-%, more preferably from 8 to 12 wt.-%. The exhaust gas treatment system of any of embodiments 1 to 29, wherein independently from one another optional Mn is present in the one or more oxidation catalyst components in the form of one or more cations of Mn, wherein Mn is preferably contained in the first washcoat layer of the one or more oxidation catalyst components as one or more oxides, wherein Mn is more preferably contained in the first washcoat layer of the one or more oxidation catalyst components as one or more oxides of Mn(ll), Mn(lll), M n(l l / l 11), and Mn(IV), more preferably as one or more oxides selected from the group consisting of MnO, Mn2O3, MnsC , MnC>2, and Mn(O)OH, and Mn-Zr mixed oxides, including mixtures of two or more thereof, wherein the Mn-Zr mixed oxides are preferably contained in the first washcoat layer of the one or more oxidation catalyst components as a solid solution. 31 . The exhaust gas treatment system of any of embodiments 1 to 30, wherein independently from one another the first washcoat layer of the one or more oxidation catalyst components comprises a particulate support material, wherein optional Mn is supported on the particulate support material, wherein the particulate support material is preferably selected from the group consisting of ZrO2, AI2O3, SiO2, TiO2, La2O3-doped ZrO2, CeO2-ZrO2 mixed oxide, La2O3-doped CeO2-ZrO2 mixed oxide, Nd2O3-doped CeO2-ZrO2 mixed oxide, Y2O3- doped CeO2-ZrO2 mixed oxide, praseodymium oxide-doped CeO2-ZrO2 mixed oxide ZrO2- doped AI2O3, ZrO2-doped SiO2, SiO2-doped AI2O3, CUO-AI2O3 mixed oxide, and mixtures of two or more thereof, more preferably from the group consisting of ZrO2, La2O3-doped ZrO2, CeO2-ZrO2 mixed oxide, La2O3-doped CeO2-ZrO2 mixed oxide, Nd2O3-doped CeO2- ZrO2mixed oxide, Y2O3-doped CeO2-ZrO2 mixed oxide, P^Os-doped CeO2-ZrO2 mixed oxide, PreOn-doped CeO2-ZrO2 mixed oxide, PrO2-doped CeO2-ZrO2 mixed oxide, ZrO2- doped AI2O3, ZrO2-doped SiO2, and mixtures of two or more thereof, more preferably from the group consisting of ZrO2, La2O3-doped ZrO2, CeO2-ZrO2 mixed oxide, La2O3-doped CeO2-ZrO2 mixed oxide, Nd2O3-doped CeO2-ZrO2 mixed oxide, Y2O3-doped CeO2-ZrO2 mixed oxide, P^Os-doped CeO2-ZrO2 mixed oxide, P^On-doped CeO2-ZrO2 mixed oxide, and mixtures of two or more thereof, wherein more preferably Mn is supported on particulate La2O3-doped ZrO2, wherein preferably ZrO2is doped with La20s in an amount ranging from 1 to 50 wt.% based on 100 wt.-% of ZrO2and La20s, preferably from 3 to 30 wt.-%, more preferably from 5 to 15 wt.-%, more preferably from 8 to 10 wt.-%.

[0130] 32. The exhaust gas treatment system of any of embodiments 1 to 31 , wherein independently from one another the first washcoat layer of the one or more oxidation catalyst components comprises Ce, wherein Ce is preferably contained in the first washcoat layer of the one or more oxidation catalyst components as CeC>2 and / or Ce2Os.

[0131] 33. The exhaust gas treatment system of embodiment 32, wherein independently from one another the content of Ce, calculated as the element, in the first washcoat layer of the one or more oxidation catalyst components is in the range of from 1 to 50 wt.-% based on 100 wt.-% of the first washcoat layer, preferably from 2 to 30 wt.-%, more preferably from 5 to 20 wt.-%, more preferably from 8 to 12 wt.-%.

[0132] 34. The exhaust gas treatment system of embodiment 32 or 33, wherein Ce is supported on a particulate support material, wherein the particulate support material is preferably selected from the group consisting of ZrO2, AI2O3, SiO2, TiO2, La2O3-doped ZrO2, CeO2-ZrO2 mixed oxide, La2O3-doped CeO2-ZrO2 mixed oxide, Nd2O3-doped CeO2-ZrO2 mixed oxide, Y2O3- doped CeO2-ZrO2 mixed oxide, praseodymium oxide-doped CeO2-ZrO2 mixed oxide, ZrO2-doped AI2O3, ZrO2-doped SiO2, SiO2-doped AI2O3, CUO-AI2O3 mixed oxide, and mixtures of two or more thereof, more preferably from the group consisting of ZrO2, La20s- doped ZrO2, CeO2-ZrO2 mixed oxide, La2O3-doped CeO2-ZrO2 mixed oxide, Nd2O3-doped CeO2-ZrO2 mixed oxide, Y2O3-doped CeO2-ZrO2 mixed oxide, P^Os-doped CeO2-ZrO2 mixed oxide, P^On-doped CeO2-ZrO2 mixed oxide, PrO2-doped CeO2-ZrO2 mixed oxide, ZrC>2-doped AI2O3, ZrC>2-doped SiC>2, and mixtures of two or more thereof, more preferably from the group consisting of ZrC>2, La2C>3-doped ZrC>2, CeO2-ZrO2 mixed oxide, La20s- doped CeO2-ZrC>2 mixed oxide, Nd2Os-doped CeO2-ZrO2 mixed oxide, Y2Os-doped CeC>2- ZrO2mixed oxide, P^Os-doped CeO2-ZrO2 mixed oxide, P^On-doped CeO2-ZrO2 mixed oxide, and mixtures of two or more thereof, wherein more preferably Ce is supported on particulate La2C>3-doped ZrC>2, wherein preferably ZrO2is doped with La20s in an amount ranging from 1 to 50 wt.% based on 100 wt.-% of ZrO2and La20s, preferably from 3 to 30 wt.-%, more preferably from 5 to 15 wt.-%, more preferably from 8 to 10 wt.-%.

[0133] 35. The exhaust gas treatment system of any of embodiments 1 to 34, wherein independently from one another the first washcoat layer of the one or more oxidation catalyst components is substantially free of Ce, wherein preferably the first washcoat layer of the one or more oxidation catalyst components is free of Ce.

[0134] 36. The exhaust gas treatment system of embodiment 35, wherein independently from one another the one or more oxidation catalyst components are substantially free of Ce, wherein preferably the one or more oxidation catalyst components are free of Ce.

[0135] 37. The exhaust gas treatment system of any of embodiments 1 to 36, wherein independently from one another the first washcoat layer of the one or more oxidation catalyst components comprises Cu, wherein the first washcoat layer of the one or more oxidation catalyst components preferably comprises CuO, CU2O, or CuO and CU2O, more preferably CuO.

[0136] 38. The exhaust gas treatment system of embodiment 37, wherein independently from one another the content of Cu, calculated as the element, in the first washcoat layer of the one or more oxidation catalyst components is in the range of from 1 to 50 wt.-% based on 100 wt.-% of the first washcoat layer, preferably from 2 to 30 wt.-%, more preferably from 5 to 20 wt.-%, more preferably from 8 to 12 wt.-%.

[0137] 39. The exhaust gas treatment system of embodiment 37 or 38, wherein Cu is supported on a particulate support material, wherein the particulate support material is preferably selected from the group consisting of ZrO2, AI2O3, SiO2, TiO2, La2O3-doped ZrO2, CeO2-ZrO2 mixed oxide, La2O3-doped CeO2-ZrO2 mixed oxide, Nd2O3-doped CeO2-ZrO2 mixed oxide, Y2O3- doped CeO2-ZrO2 mixed oxide, praseodymium oxide-doped CeO2-ZrO2 mixed oxide ZrO2- doped AI2O3, ZrO2-doped SiO2, SiO2-doped AI2O3, CUO-AI2O3 mixed oxide, and mixtures of two or more thereof, more preferably from the group consisting of ZrO2, La2O3-doped ZrO2, CeO2-ZrO2 mixed oxide, La2O3-doped CeO2-ZrO2 mixed oxide, Nd2O3-doped CeO2- ZrO2mixed oxide, Y2O3-doped CeO2-ZrO2 mixed oxide, P^Os-doped CeO2-ZrO2 mixed oxide, PreOn-doped CeO2-ZrO2 mixed oxide, PrO2-doped CeO2-ZrO2 mixed oxide, ZrO2- doped AI2O3, ZrO2-doped SiO2, and mixtures of two or more thereof, more preferably from the group consisting of ZrO2, La2O3-doped ZrO2, CeO2-ZrO2 mixed oxide, La2O3-doped CeO2-ZrC>2 mixed oxide, Nd2Os-doped CeO2-ZrO2 mixed oxide, Y2Os-doped CeO2-ZrO2 mixed oxide, P^Os-doped CeO2-ZrO2 mixed oxide, P^On-doped CeO2-ZrO2 mixed oxide, and mixtures of two or more thereof, wherein more preferably Cu is supported on particulate La2C>3-doped ZrC>2, wherein preferably ZrO2is doped with La20s in an amount ranging from 1 to 50 wt.% based on 100 wt.-% of ZrO2and La20s, preferably from 3 to 30 wt.-%, more preferably from 5 to 15 wt.-%, more preferably from 8 to 10 wt.-%.

[0138] 40. The exhaust gas treatment system of any of embodiments 1 to 39, wherein independently from one another the first washcoat layer of the one or more oxidation catalyst components is substantially free of Cu, wherein preferably the first washcoat layer of the one or more oxidation catalyst components is free of Cu.

[0139] 41 . The exhaust gas treatment system of embodiment 40, wherein independently from one another the one or more oxidation catalyst components are substantially free of Cu, wherein preferably the one or more oxidation catalyst components are free of Cu.

[0140] 42. The exhaust gas treatment system of any of embodiments 1 to 41 , wherein independently from one another the first substrate of the one or more oxidation catalyst components is a wall-flow substrate or a flow-through substrate, preferably a honeycomb wall-flow substrate or a honeycomb flow-through substrate, more preferably a honeycomb flow-through substrate, wherein the flow-through substrate is more preferably a flow-through substrate with high porosity walls.

[0141] 43. The exhaust gas treatment system of any of embodiments 1 to 42, wherein independently from one another the loading of the first washcoat layer of the one or more oxidation catalyst components is in the range of from 0.3 to 6 g / in3, preferably of from 1 to 5 g / in3, more preferably of from 1 .5 to 4 g / in3, more preferably of from 2 to 3.5 g / in3, more preferably of from 2.3 to 2.9 g / in3, more preferably of from 2.5 to 2.7 g / in3.

[0142] 44. The exhaust gas treatment system of any of embodiments 1 to 43, wherein independently from one another the loading of the second washcoat layer of the one or more oxidation catalyst components is in the range of from 0.25 to 6 g / in3, preferably of from 0.3 to 6 g / in3, more preferably of from 1 to 5 g / in3, more preferably of from 1 .5 to 4 g / in3, more preferably of from 2 to 3.5 g / in3, more preferably of from 2.2 to 3.0 g / in3, more preferably of from 2.3 to 2.9 g / in3, more preferably of from 2.5 to 2.7 g / in3.

[0143] 45. The exhaust gas treatment system of any of embodiments 1 to 44, wherein independently from one another the one or more oxidation catalyst components comprise one or more platinum group metals consisting of Pt, Pd, or Pt and Pd, wherein preferably the one or more oxidation catalyst components comprise Pt, or Pt and Pd as the one or more platinum group metals, wherein more preferably the one or more oxidation catalyst components comprise Pt and Pd as the one or more platinum group metals.

[0144] 46. The exhaust gas treatment system of any of embodiments 1 to 45, wherein independently from one another the one or more oxidation catalyst components comprise Pt, calculated as the element, at a loading in the range of from 2 to 250 g / ft3, preferably of from 5 to 150 g / ft3, more preferably of from 10 to 125 g / ft3, more preferably of from 20 to 100 g / ft3, more preferably of from 25 to 85 g / ft3, more preferably of from 30 to 80 g / ft3, more preferably of from 40 to 60 g / ft3.

[0145] 47. The exhaust gas treatment system of any of embodiments 1 to 46, wherein independently from one another the one or more oxidation catalyst components comprise Pd, calculated as the element, at a loading in the range of from 5 to 100 g / ft3, preferably of from 5 to 60 g / ft3, more preferably of from 10 to 50 g / ft3, more preferably of from 15 to 40 g / ft3, more preferably of from 20 to 30 g / ft3.

[0146] 48. The exhaust gas treatment system of any of embodiments 1 to 47, wherein independently from one another the one or more oxidation catalyst components comprise Pt and Pd, calculated as the respective element, at a total Pt and Pd loading in the range of from 2 to 250 g / ft3, preferably of from 5 to 200 g / ft3, more preferably of from 10 to 150 g / ft3, more preferably of from 20 to 130 g / ft3, more preferably of from 30 to 125 g / ft3, more preferably of from 40 to 110 g / ft3, more preferably of from 50 to 100 g / ft3, more preferably of from 60 to 90 g / ft3, more preferably of from 70 to 80 g / ft3.

[0147] 49. The exhaust gas treatment system of any of embodiments 1 to 48, wherein independently from one another the one or more oxidation catalyst components comprise Pt and Pd at a Pt : Pd weight ratio in the range of from 1 :2 to 20:1 , preferably of from 50:50 to 80:20, more preferably of from 60:40 to 75:25, more preferably of from 65:35 to 70:30.

[0148] 50. The exhaust gas treatment system of any of embodiments 1 to 49, wherein independently from one another the one or more platinum group metals are supported on a particulate support material, wherein the particulate support material is preferably selected from the group consisting of AI2O3, SiC>2, TiC>2, SiC>2-doped AI2O3, Mn oxide-doped AI2O3, and mixtures of two or more thereof, wherein preferably the one or more platinum group metals are supported on AI2O3 and / or SiC>2-doped AI2O3 and / or Mn oxide-doped AI2O3, more preferably SiC>2-doped AI2O3 or AI2O3 or Mn oxide-doped AI2O3, wherein the Mn oxide-doped AI2O3 preferably comprises from 1 to 10 weight-%, more preferably from 4 to 6 weight-%, of Mn oxide, calculated as Mn oxide, based on 100 weight-% of the Mn oxide-doped AI2O3. 51 . The exhaust gas treatment system of any of embodiments 1 to 50, wherein independently from one another the first washcoat layer of the one or more oxidation catalyst components comprises a hydrocarbon trap material, wherein the hydrocarbon trap material comprises a molecular sieve, preferably a zeolite, more preferably a zeolite having a maximum pore size of 12-membered rings, more preferably zeolite beta, wherein the molecular sieve, preferably the zeolite, preferably comprises SiC>2 and AI2O3, wherein the molecular sieve, preferably the zeolite, more preferably has a molar ratio of SiC>2 to AI2O3 in the range of from 10:1 to 500:1 , more preferably of from 10:1 to 100:1 , more preferably of from 10:1 to 40:1 , more preferably of from 15:1 to 30:1 , more preferably of from 20:1 to 25:1 , wherein the molecular sieve, preferably the zeolite, preferably comprises Fe, wherein the molecular sieve, preferably the zeolite, more preferably comprises Fe, calculated as Fe2C>3, in an amount in the range of from 1.0 to 7.0 weight-%, more preferably of from 3.0 to 5.0 weight-%, more preferably of from 4.0 to 4.5 weight-%, based on the weight of the molecular sieve.

[0149] 52. The exhaust gas treatment system of embodiment 51 , wherein independently from one another the loading of the hydrocarbon trap material in the first washcoat layer of the one or more oxidation catalyst components is in the range of from 0.01 to 2.0 g / in3, preferably in the range of from 0.05 to 1 .0 g / in3, more preferably in the range of from 0.05 to 0.3 g / in3.

[0150] 53. The exhaust gas treatment system of any of embodiments 1 to 52, wherein independently from one another the one or more oxidation catalyst components comprise a second washcoat layer, wherein the one or more platinum group metals are at least in part contained in the second washcoat layer of the one or more oxidation catalyst components, wherein preferably the one or more platinum group metals are entirely contained in the second washcoat layer of the one or more oxidation catalyst components.

[0151] 54. The exhaust gas treatment system of any of embodiments 1 to 53, wherein independently from one another the second washcoat layer of the one or more oxidation catalyst components comprises a hydrocarbon trap material, wherein the hydrocarbon trap material comprises a molecular sieve, preferably a zeolite, more preferably a zeolite having a maximum pore size defined by 12-membered rings, more preferably zeolite beta, wherein the molecular sieve, preferably the zeolite, preferably comprises SiC>2 and AI2O3, wherein the molecular sieve, preferably the zeolite, more preferably has a molar ratio of SiC>2 to AI2O3 in the range of from 10:1 to 40:1 , more preferably of from 15:1 to 30:1 , more preferably of from 20:1 to 25:1 , wherein the molecular sieve, preferably the zeolite, preferably comprises Fe, wherein the molecular sieve, preferably the zeolite, more preferably comprises Fe, calculated as Fe20s, in an amount in the range of from 1 .0 to 7.0 weight-%, more preferably of from 3.0 to 5.0 weight-%, more preferably of from 4.0 to 4.5 weight-%, based on the weight of the molecular sieve. 55. The exhaust gas treatment system of embodiment 54, wherein independently from one another the loading of the hydrocarbon trap material in the second washcoat layer of the one or more oxidation catalyst components is in the range of from 0.01 to 2.0 g / in3, preferably in the range of from 0.05 to 1 .0 g / in3g / in3, more preferably in the range of from 0.05 to 0.3 g / in3.

[0152] 56. The exhaust gas treatment system of any of embodiments 1 to 55, wherein independently from one another the one or more oxidation catalyst components comprise a second washcoat layer, wherein the one or more oxidation catalyst components display a layered arrangement of the first and second washcoat layers, and wherein the one or more platinum group metals are at least in part contained in the second washcoat layer of the one or more oxidation catalyst components.

[0153] 57. The exhaust gas treatment system of embodiment 56, wherein independently from one another the first washcoat layer of the one or more oxidation catalyst components is provided on the first substrate, and the second washcoat layer is provided on the first washcoat layer.

[0154] 58. The exhaust gas treatment system of embodiment 56 or 57, wherein independently from one another the second washcoat layer of the one or more oxidation catalyst components is provided on the first substrate, and the first washcoat layer is provided on the second washcoat layer.

[0155] 59. The exhaust gas treatment system of embodiment 56 or 57, wherein independently from one another the one or more oxidation catalyst components comprise a third washcoat layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the first, second, and third washcoat layers, wherein the third washcoat layer is provided on the first substrate along its axial length starting from the inlet end of the first substrate and wherein the first washcoat layer is provided on the first substrate along its axial length starting from the outlet end of the first substrate, and wherein the second washcoat layer is provided on and entirely covers the first washcoat layer, wherein the length of the first washcoat layer is less than the axial length of the first substrate such as to create an upstream zone comprising the third washcoat layer and a downstream zone comprising the first and second washcoat layers, and wherein the one or more platinum group metals are at least in part contained in the third washcoat layer.

[0156] 60. The exhaust gas treatment system of embodiment 56 or 58, wherein independently from one another the one or more oxidation catalyst components comprise a third washcoat layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the first, second, and third washcoat layers, wherein the third washcoat layer is provided on the first substrate along its axial length starting from the inlet end of the first substrate and wherein the second washcoat layer is provided on the first substrate along its axial length starting from the outlet end of the first substrate, and wherein the first washcoat layer is provided on and entirely covers the second washcoat layer, wherein the length of the second washcoat layer is less than the axial length of the first substrate such as to create an upstream zone comprising the third washcoat layer and a downstream zone comprising the first and second washcoat layers, and wherein the one or more platinum group metals are at least in part contained in the third washcoat layer.

[0157] 61 . The exhaust gas treatment system of embodiment 56 or 57, wherein independently from one another the one or more oxidation catalyst components comprise a third washcoat layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the first, second, and third washcoat layers, wherein the third washcoat layer is provided on the first substrate along its axial length starting from the outlet end of the first substrate and wherein the first washcoat layer is provided on the first substrate along its axial length starting from the inlet end of the first substrate, and wherein the second washcoat layer is provided on and entirely covers the first washcoat layer, wherein the length of the first washcoat layer is less than the axial length of the first substrate such as to create a downstream zone comprising the third washcoat layer and an upstream zone comprising the first and second washcoat layers, and wherein the one or more platinum group metals are at least in part contained in the third washcoat layer.

[0158] 62. The exhaust gas treatment system of embodiment 56 or 58, wherein independently from one another the one or more oxidation catalyst components comprise a third washcoat layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the first, second, and third washcoat layers, wherein the third washcoat layer is provided on the first substrate along its axial length starting from the outlet end of the first substrate and wherein the second washcoat layer is provided on the first substrate along its axial length starting from the inlet end of the first substrate, and wherein the first washcoat layer is provided on and entirely covers the second washcoat layer, wherein the length of the second washcoat layer is less than the axial length of the first substrate such as to create a downstream zone comprising the third washcoat layer and an upstream zone comprising the first and second washcoat layers, and wherein the one or more platinum group metals are at least in part contained in the third washcoat layer.

[0159] 63. The exhaust gas treatment system of any of embodiments 1 to 55, wherein independently from one another the one or more oxidation catalyst components comprise a second washcoat layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the first and second washcoat layers, wherein the second washcoat layer is provided on the first substrate along its axial length starting from the inlet end of the first substrate, and wherein the first washcoat layer is provided on the first substrate along its axial length starting from the outlet end of the first substrate, wherein the length of the first washcoat layer is less than the axial length of the first substrate such as to create an upstream zone comprising the second washcoat layer and a downstream zone comprising the first washcoat layer, and wherein the one or more platinum group metals are at least in part contained in the second washcoat layer.

[0160] 64. The exhaust gas treatment system of any of embodiments 1 to 55, wherein independently from one another the one or more oxidation catalyst components comprise a second washcoat layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the first and second washcoat layers, wherein the first washcoat layer is provided on the first substrate along its axial length starting from the inlet end of the first substrate, and wherein the second washcoat layer is provided on the first substrate along its axial length starting from the outlet end of the first substrate, wherein the length of the first washcoat layer is less than the axial length of the first substrate such as to create an upstream zone comprising the first washcoat layer and a downstream zone comprising the second washcoat layer, and wherein the one or more platinum group metals are at least in part contained in the second washcoat layer.

[0161] 65. The exhaust gas treatment system of any of embodiments 1 to 55, wherein independently from one another the one or more oxidation catalyst components comprise a second washcoat layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the first and second washcoat layers, wherein the second washcoat layer is provided on the first substrate along its axial length starting from the inlet end of the first substrate, and wherein the first washcoat layer is provided on the first substrate along its axial length starting from the outlet end of the first substrate, wherein the length of the second washcoat layer is less than the axial length of the first substrate such as to create an upstream zone comprising the second washcoat layer and a downstream zone comprising the first washcoat layer, and wherein the one or more platinum group metals are at least in part contained in the second washcoat layer.

[0162] 66. The exhaust gas treatment system of any of embodiments 1 to 55, wherein independently from one another the one or more oxidation catalyst components comprise a second washcoat layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the first and second washcoat layers, wherein the first washcoat layer is provided on the first substrate along its axial length starting from the inlet end of the first substrate, and wherein the second washcoat layer is provided on the first substrate along its axial length starting from the outlet end of the first substrate, wherein the length of the second washcoat layer is less than the axial length of the first substrate such as to create an upstream zone comprising the first washcoat layer and a downstream zone comprising the second washcoat layer, and wherein the one or more platinum group metals are at least in part contained in the second washcoat layer. 67. The exhaust gas treatment system of embodiment 63 or 65, wherein independently from one another the one or more oxidation catalyst components comprise a third washcoat layer, wherein the third washcoat layer is provided on the first layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the second and third washcoat layers, wherein the second washcoat layer is provided on the first substrate along the axial length of the first substrate starting from the inlet end of the first substrate, and wherein the third washcoat layer is provided on the first washcoat layer along the axial length of the first substrate starting from the outlet end of the first substrate, wherein the length of the third washcoat layer is less than the axial length of the first substrate such as to create an upstream zone comprising the second washcoat layer and a downstream zone comprising the first and third washcoat layers.

[0163] 68. The exhaust gas treatment system of embodiment 64 or 66, wherein independently from one another the one or more oxidation catalyst components comprise a third washcoat layer, wherein the third washcoat layer is provided on the first layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the second and third washcoat layers, wherein the third washcoat layer is provided on the first washcoat layer along the axial length of the first substrate starting from the inlet end of the first substrate, and wherein the second washcoat layer is provided on the first substrate along the axial length of the first substrate starting from the outlet end of the first substrate, wherein the length of the third washcoat layer is less than the axial length of the first substrate such as to create an upstream zone comprising the first and third washcoat layers and a downstream zone comprising the second washcoat layer.

[0164] 69. The exhaust gas treatment system of any of embodiments 59 to 68, wherein the first and second washcoat layers are adjacent to one another.

[0165] 70. The exhaust gas treatment system of embodiment 59 to 69, wherein the second and third washcoat layers are adjacent to one another.

[0166] 71 . The exhaust gas treatment system of any of embodiments 59 to 70, wherein a portion of the second washcoat layer overlaps at least a portion of the first washcoat layer, wherein preferably the second washcoat layer overlaps the first washcoat layer over a portion ranging from 10 to 100% of the axial length of the first washcoat layer, more preferably from 15 to 80%, and more preferably from 20 to 50%.

[0167] 72. The exhaust gas treatment system of any of embodiments 59 to 71 , wherein a portion of the first washcoat layer overlaps at least a portion of the second washcoat layer, wherein preferably the first washcoat layer overlaps the second washcoat layer over a portion ranging from 10 to 100% of the axial length of the second washcoat layer, more preferably from 15 to 80%, and more preferably from 20 to 50%. The exhaust gas treatment system of any of embodiments 59 to 72, wherein, independently from one another, the one or more oxidation catalyst components comprise second and third washcoat layers, wherein a portion of the third washcoat layer overlaps at least a portion of the first washcoat layer, wherein preferably the third washcoat layer overlaps the first washcoat layer over a portion ranging from 10 to 100% of the axial length of the first washcoat layer, more preferably from 15 to 80%, and more preferably from 20 to 50%. The exhaust gas treatment system of any of embodiments 1 to 55, wherein independently from one another the one or more oxidation catalyst components comprise a second washcoat layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the first and second washcoat layers, wherein the second washcoat layer is provided on the first substrate along its entire length, and wherein the first washcoat layer is provided on the second washcoat layer along its axial length starting from the outlet end of the first substrate, wherein the length of the first washcoat layer is less than the axial length of the first substrate such as to create an upstream zone comprising the second washcoat layer and a downstream zone comprising the first washcoat layer over the second washcoat layer, and wherein the one or more platinum group metals are at least in part contained in the second washcoat layer. The exhaust gas treatment system of any of embodiments 1 to 55, wherein independently from one another the one or more oxidation catalyst components comprise a second washcoat layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the first and second washcoat layers, wherein the second washcoat layer is provided on the first substrate along its entire length, and wherein the first washcoat layer is provided on the second washcoat layer along its axial length starting from the inlet end of the first substrate, wherein the length of the first washcoat layer is less than the axial length of the first substrate such as to create an upstream zone comprising the first washcoat layer over the second washcoat layer and a downstream zone comprising the second washcoat layer, and wherein the one or more platinum group metals are at least in part contained in the second washcoat layer. The exhaust gas treatment system of embodiment 74 or 75, wherein the length of the first washcoat layer ranges from 10 to 90% of the axial length of the first substrate, preferably from 30 to 80%, and more preferably from 50 to 70%. The exhaust gas treatment system of any of embodiments 1 to 55, wherein independently from one another the one or more oxidation catalyst components comprise a second washcoat layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the first and second washcoat layers, wherein the first washcoat layer is provided on the first substrate along its entire length, and wherein the second washcoat layer is provided on the first washcoat layer along its axial length starting from the inlet end of the first substrate, wherein the length of the second washcoat layer is less than the axial length of the first substrate such as to create an upstream zone comprising the second washcoat layer over the first washcoat layer and a downstream zone comprising the first washcoat layer, and wherein the one or more platinum group metals are at least in part contained in the second washcoat layer. The exhaust gas treatment system of embodiment 77, wherein independently from one another the one or more oxidation catalyst components comprise a third washcoat layer, wherein the third washcoat layer is provided on the first layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the second and third washcoat layers, wherein the second washcoat layer is provided on the first washcoat layer along the axial length of the first substrate starting from the inlet end of the first substrate, and wherein the third washcoat layer is provided on the first washcoat layer along the axial length of the first substrate starting from the outlet end of the first substrate, wherein the length of the third washcoat layer is less than the axial length of the first substrate such as to create an upstream zone comprising the second washcoat layer and a downstream zone comprising the third washcoat layer. The exhaust gas treatment system of any of embodiments 1 to 55, wherein independently from one another the one or more oxidation catalyst components comprise a second washcoat layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the first and second washcoat layers, wherein the first washcoat layer is provided on the first substrate along its entire length, and wherein the second washcoat layer is provided on the first washcoat layer along its axial length starting from the outlet end of the first substrate, wherein the length of the second washcoat layer is less than the axial length of the first substrate such as to create an upstream zone comprising the first washcoat layer and a downstream zone comprising the second washcoat layer over the first washcoat layer, and wherein the one or more platinum group metals are at least in part contained in the second washcoat layer. The exhaust gas treatment system of embodiment 79, wherein independently from one another the one or more oxidation catalyst components comprise a third washcoat layer, wherein the third washcoat layer is provided on the first layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the second and third washcoat layers, wherein the third washcoat layer is provided on the first washcoat layer along the axial length of the first substrate starting from the inlet end of the first substrate, and wherein the second washcoat layer is provided on the first washcoat layer along the axial length of the first substrate starting from the outlet end of the first substrate, wherein the length of the third washcoat layer is less than the axial length of the first substrate such as to create an upstream zone comprising the third washcoat layer and a downstream zone comprising the second washcoat layer. The exhaust gas treatment system of embodiment 78 or 80, wherein the second and third washcoat layers are adjacent to one another. The exhaust gas treatment system of any of embodiments 1 to 55, wherein independently from one another the length of the first washcoat layer of the one or more oxidation catalyst components ranges from 5 to 100% of the axial length of the first substrate, preferably from 10 to 90% of the axial length of the first substrate, preferably from 15 to 75%, more preferably from 20 to 60%, more preferably from 25 to 50%, and more preferably from 35 to 45%. The exhaust gas treatment system of any of embodiments 56 to 82, wherein the length of the second washcoat layer ranges from 5 to 100% of the axial length of the first substrate, preferably from 10 to 90% of the axial length of the first substrate, more preferably from 15 to 75%, more preferably from 20 to 60%, more preferably from 25 to 50%, and more preferably from 35 to 45%. The exhaust gas treatment system of any of embodiments 59 to 83, wherein the length of the third washcoat layer ranges from 5 to 100% of the axial length of the first substrate, preferably from 10 to 90% of the axial length of the first substrate, preferably from 15 to 75%, more preferably from 20 to 60%, more preferably from 25 to 50%, and more preferably from 35 to 45%. The exhaust gas treatment system of any of embodiments 59 to 84, wherein the third washcoat layer comprises a hydrocarbon trap material, wherein the hydrocarbon trap material comprises a molecular sieve, preferably a zeolite, more preferably a zeolite having a maximum pore size of 12-membered rings, more preferably zeolite beta, wherein the molecular sieve, preferably the zeolite, preferably comprises SiC>2 and AI2O3, wherein the molecular sieve, preferably the zeolite, more preferably has a molar ratio of SiC>2 to AI2O3 in the range of from 10:1 to 500:1 , more preferably of from 10:1 to 100:1 , more preferably of from 10:1 to 40:1 , more preferably of from 15:1 to 30:1 , more preferably of from 20:1 to 25:1 , wherein the molecular sieve, preferably the zeolite, preferably comprises Fe, wherein the molecular sieve, preferably the zeolite, more preferably comprises Fe, calculated as Fe2C>3, in an amount in the range of from 1.0 to 7.0 weight-%, more preferably of from 3.0 to 5.0 weight-%, more preferably of from 4.0 to 4.5 weight-%, based on the weight of the molecular sieve. The exhaust gas treatment system of embodiment 85, wherein the loading of the hydrocarbon trap material in the third washcoat layer is in the range of from 0.01 to 2.0 g / in3, preferably in the range of from 0.05 to 1 .0 g / in3, more preferably in the range of from 0.05 to 0.3 g / in3. 87. The exhaust gas treatment system of any of embodiments 59 to 86, wherein the one or more platinum group metals are at least in part contained in the third washcoat layer.

[0168] 88. The exhaust gas treatment system of embodiment 87, wherein the one or more platinum group metals are supported on a particulate support material, wherein the particulate support material is preferably selected from the group consisting of AI2O3, SiC>2, TiC>2, SiC>2- doped AI2O3, Mn oxide-doped AI2O3, and mixtures of two or more thereof, wherein preferably the one or more platinum group metals are supported on AI2O3 and / or SiC>2-doped AI2O3 and / or Mn oxide-doped AI2O3, more preferably SiC>2-doped AI2O3 or AI2O3 or Mn ox- ide-doped AI2O3, wherein the Mn oxide-doped AI2O3 preferably comprises from 1 to 10 weight-%, more preferably from 4 to 6 weight-%, of Mn oxide, calculated as MnC>2, based on 100 weight-% of the Mn oxide-doped AI2O3.

[0169] 89. The exhaust gas treatment system of any of embodiments 59 to 88, wherein independently from one another the one or more oxidation catalyst components comprise second and third washcoat layers, wherein the one or more platinum group metals are entirely contained in the second and third washcoat layers, wherein the weight ratio of the one or more platinum group metals comprised in the second washcoat layer to the one or more platinum group metals comprised in the third washcoat layer is in the range of from 0.5:1 to 5.0:1 , more preferably 1.0:1 to 2.0:1 , more preferably in the range of from 1.4:1 to 1 .6:1 , wherein the one or more platinum group metals comprised in the second washcoat layer preferably comprise, more preferably consist of, Pt and Pd, wherein the one or more platinum group metals comprised in the third washcoat layer preferably comprise, more preferably consist of, Pt and Pd.

[0170] 90. The exhaust gas treatment system of any of embodiments 59 to 89, wherein independently from one another the loading of optional Mn, calculated as the element, in the zone of the one or more oxidation catalyst components containing the first washcoat layer is in the range of from 0.04 to 0.9 g / in3, based on the volume of the zone of the catalyst containing the first washcoat layer, preferably of from 0.05 to 0.8 g / in3, more preferably of from 0.15 to 0.5 g / in3, more preferably of from 0.2 to 0.35 g / in3, more preferably of from 0.23 to 0.29 g / in3, more preferably of from 0.25 to 0.27 g / in3.

[0171] 91 . The exhaust gas treatment system of any of embodiments 56 to 90, wherein the one or more platinum group metals are entirely contained in the second washcoat layer or in the second and third washcoat layers.

[0172] 92. The exhaust gas treatment system of any of embodiments 56 to 91 , wherein the one or more platinum group metals are at least in part contained in the first washcoat layer. 93. The exhaust gas treatment system of any of embodiments 1 to 92, wherein independently from one another the first substrate of the one or more oxidation catalyst components is a metallic first substrate or a ceramic first substrate, wherein preferably the first substrate is a ceramic first substrate, wherein more preferably the first substrate comprises cordierite and / or SiC, preferably cordierite, wherein more preferably, the first substrate consists of cordierite and / or SiC, preferably of cordierite.

[0173] 94. The exhaust gas treatment system of any of embodiments 1 to 93, wherein the exhaust gas stream contains hydrocarbons, preferably C1 to C20 hydrocarbons, more preferably C2 to C10 hydrocarbons.

[0174] CITED LITERATURE

[0175] - WO 2022 / 047132 A1

[0176] - US 10,598,061 B2

[0177] - US 10,392,980 B2

[0178] - WO 2021 / 198680 A1

[0179] - US 2019 / 262772 A1

[0180] - US 2017 / 009623 A1

[0181] - US 2015 / 352493 A1

[0182] - US 2018 / 318805 A1

[0183] M. C. Alvarez-Galvan et al. in Applied Catalysis B. 2004, 51 , 83-91

[0184] - US 2012 / 240554 A1

[0185] - US 2013 / 058849 A1

[0186] - US 2015 / 252708 A1

[0187] - US 2015 / 352493 A1

Claims

Claims1 . Exhaust gas treatment system comprising an internal combustion engine and an exhaust gas conduit for exhaust gas from the internal combustion engine, wherein the exhaust gas conduit comprises one or more oxidation catalyst components and one or more further catalyst components, wherein independently from one another, the one or more oxidation catalyst components comprise a first washcoat layer, wherein the first washcoat layer optionally comprises Mn, and a first substrate, wherein the first substrate has an inlet end through which the exhaust gas stream may enter the oxidation catalyst component, and an outlet end through which the exhaust gas stream may exit the oxidation catalyst component, wherein the oxidation catalyst component comprises one or more platinum group metals comprising Pt, Pd, or Pt and Pd, wherein the one or more platinum group metals are at least in part contained in one or more of:(a) the first washcoat layer, and(b) an optional second washcoat layer, or(c) optional second and third washcoat layers; and wherein independently from one another, the one or more further catalyst components comprise a catalyst component washcoat layer comprising Mn, and a catalyst component substrate, wherein the catalyst component substrate has an inlet end through which the exhaust gas stream may enter the further catalyst component, and an outlet end through which the exhaust gas stream may exit the further catalyst component.

2. The exhaust gas treatment system of claim 1 , wherein independently from one another, the one or more further catalyst components are selected from the group consisting of a selective catalytic reduction (SCR) catalyst, an ammonia oxidation (AMOX) catalyst, a catalyzed soot filter (CSF), a selective catalytic reduction catalyst on filter (SCRoF), and a diesel exotherm catalyst (DEC).

3. The exhaust gas treatment system of claim 1 or 2, wherein the system further comprises one or more of an electric heater, a fuel burner, and a fuel injector.

4. The exhaust gas treatment system of any of claims 1 to 3, comprising in consecutive order in the direction of the exhaust gas: optionally an electric heater or a fuel burner and / or a fuel injector, one or more of the oxidation catalyst components, and one or more of the further catalyst components.

5. The exhaust gas treatment system of any of claims 1 to 4, wherein independently from one another the first washcoat layer of the one or more oxidation catalyst components comprises a particulate support material, wherein optional Mn is supported on the particulate support material.

6. The exhaust gas treatment system of any of claims 1 to 5, wherein independently from one another the first washcoat layer of the one or more oxidation catalyst components comprises Ce.

7. The exhaust gas treatment system of any of claims 1 to 6, wherein independently from one another the first washcoat layer of the one or more oxidation catalyst components comprises Cu.

8. The exhaust gas treatment system of any of claims 1 to 7, wherein independently from one another the one or more oxidation catalyst components comprise one or more platinum group metals consisting of Pt, Pd, or Pt and Pd.

9. The exhaust gas treatment system of any of claims 1 to 8, wherein independently from one another the one or more platinum group metals are supported on a particulate support material.

10. The exhaust gas treatment system of any of claims 1 to 9, wherein independently from one another the one or more oxidation catalyst components comprise a second washcoat layer, wherein the one or more platinum group metals are at least in part contained in the second washcoat layer of the one or more oxidation catalyst components.11 . The exhaust gas treatment system of any of claims 1 to 10, wherein independently from one another the second washcoat layer of the one or more oxidation catalyst components comprises a hydrocarbon trap material, wherein the hydrocarbon trap material comprises a molecular sieve.

12. The exhaust gas treatment system of any of claims 1 to 11 , wherein independently from one another the one or more oxidation catalyst components comprise a second washcoat layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the first and second washcoat layers, wherein the second washcoat layer is provided on the first substrate along its axial length starting from the inlet end of the first substrate, and wherein the first washcoat layer is provided on the first substrate along its axial length starting from the outlet end of the first substrate, wherein the length of the first washcoat layer is less than the axial length of the first substrate such as to create an upstream zone comprising the second washcoat layer and a downstream zone comprisingthe first washcoat layer, and wherein the one or more platinum group metals are at least in part contained in the second washcoat layer.

13. The exhaust gas treatment system of any of claims 1 to 11 , wherein independently from one another the one or more oxidation catalyst components comprise a second washcoat layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the first and second washcoat layers, wherein the second washcoat layer is provided on the first substrate along its axial length starting from the inlet end of the first substrate, and wherein the first washcoat layer is provided on the first substrate along its axial length starting from the outlet end of the first substrate, wherein the length of the second washcoat layer is less than the axial length of the first substrate such as to create an upstream zone comprising the second washcoat layer and a downstream zone comprising the first washcoat layer, and wherein the one or more platinum group metals are at least in part contained in the second washcoat layer.

14. The exhaust gas treatment system of claim 12 or 13, wherein independently from one another the one or more oxidation catalyst components comprise a third washcoat layer, wherein the third washcoat layer is provided on the first layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the second and third washcoat layers, wherein the second washcoat layer is provided on the first substrate along the axial length of the first substrate starting from the inlet end of the first substrate, and wherein the third washcoat layer is provided on the first washcoat layer along the axial length of the first substrate starting from the outlet end of the first substrate, wherein the length of the third washcoat layer is less than the axial length of the first substrate such as to create an upstream zone comprising the second washcoat layer and a downstream zone comprising the first and third washcoat layers.

15. The exhaust gas treatment system of any of claims 1 to 11 , wherein independently from one another the one or more oxidation catalyst components comprise a second washcoat layer, wherein the one or more oxidation catalyst components display a zoned arrangement of the first and second washcoat layers, wherein the first washcoat layer is provided on the first substrate along its entire length, and wherein the second washcoat layer is provided on the first washcoat layer along its axial length starting from the inlet end of the first substrate, wherein the length of the second washcoat layer is less than the axial length of the first substrate such as to create an upstream zone comprising the second washcoat layer over the first washcoat layer and a downstream zone comprising the first washcoat layer, and wherein the one or more platinum group metals are at least in part contained in the second washcoat layer.