Hydrogen Oxidation Catalyst for Hydrogen Internal Combustion Engine System

Abstract

This specification discloses an emissions treatment system that includes a hydrogen oxidation catalyst, the use of the catalyst for oxidizing hydrogen gas in the emissions treatment system, and a method for heat generation in an engine exhaust system. The hydrogen oxidation catalyst increases the downstream temperature to provide enhanced NO x removal and reduced N 2 O emissions compared to a comparable exhaust gas treatment system.

Description

Technical Field

[0001] This specification discloses an emissions treatment system including a hydrogen oxidation catalyst, use of the catalyst for oxidizing hydrogen gas in the emissions treatment system, and a method for heat generation in an engine exhaust system. The hydrogen oxidation catalyst is positioned at an upstream location to increase the downstream temperature and provide enhanced NO x removal and reduced N 2 O emissions compared to a comparable exhaust gas treatment system.

[0002] NO x is a term used to describe various chemical species of nitrogen oxides including, among others, nitric oxide (NO) and nitrogen dioxide (NO 2 ). The most effective NO x reduction technology has continued to be urea (or NH 3 )-SCR. One important problem for achieving high NO x reduction with selective catalytic reduction (SCR) catalysts is having an appropriate exhaust temperature for the SCR reaction, and this technology has limited efficiency at temperatures below 200°C. One way to increase low temperature SCR efficiency is to convert some NO to NO 2 with a NO oxidation catalyst (the optimal NO 2 / NO x ratio is 0.5). Unfortunately, NO oxidation efficiency is very low below 250°C even with the best available catalysts. Additionally, this can be a problem for heavy-duty diesel off-road aftertreatment systems where the SCR catalyst is positioned downstream of other catalysts such as a diesel oxidation catalyst (DOC) and a catalyzed soot filter (CSF). In such a system configuration, the SCR catalyst experiences somewhat low temperature conditions that can inhibit the SCR reaction.

[0003] International Publication No. WO 2018 / 073750 (A1) relates to an emissions treatment system and a catalyst article for selectively reducing NOx compounds, wherein the system comprises a hydrogen selective catalytic reduction article.

[0004] These exhaust characteristics create challenges for current diesel emissions catalyst technology, and in the art there remains a need for new catalyst systems to more effectively control NO emissions at low temperatures, such as during cold engine start, and to meet increasingly stringent environmental regulations. NO emissions from the exhaust treatment system x and N x and N 2 O emissions. It would be beneficial to provide components for such a system that focus on reducing NO and N

[0005] The present disclosure provides an emissions treatment system for a combustion engine, comprising a hydrogen injector positioned upstream of a hydrogen oxidation catalyst (HOC) and a NO oxidation catalyst, wherein the hydrogen oxidation catalyst and the NO oxidation catalyst are combined, and the hydrogen oxidation catalyst comprises a platinum group metal supported on a zeolite.

[0006] The HOC catalyzes the exothermic reaction between hydrogen (H 2 ) and oxygen (O 2 ). During the oxidation of H by O 2 , H 2 also reacts with NO present in the exhaust, resulting in N 2 O formation. In typical noble metal-based catalysts such as Pt, more than 30% of the converted NO becomes N 2 O. N 2 O formation is particularly preferred at low temperatures where efficient H 2 oxidation is desired. N 2 O is a potent greenhouse gas, and its formation should be minimized in automotive catalyst systems. The HOC of the present disclosure has excellent low temperature activity for this reaction, but N 2 O formation is minimized. 2The amount of O by-products is reduced. Without wishing to be bound by any theory, it is understood that the HOC of the present disclosure oxidizes the previously injected H 2 to generate heat, and that heat then increases the downstream temperature. Thus, the downstream catalyst can have its performance improved. Accordingly, the HOC can be used as an efficient exothermic catalyst for raising the inlet temperature of a downstream catalyst such as a NO oxidation catalyst or an SCR catalyst, which results in more effective NO x removal from the exhaust system.

[0007] The present disclosure is a method for exotherm in an engine exhaust system, wherein the engine exhaust system includes an emissions treatment system, and the method includes injecting hydrogen gas into the emissions treatment system including a hydrogen injector positioned upstream of a hydrogen oxidation catalyst at a temperature in the range of about 100°C to about 250°C such that the hydrogen oxidation catalyst enables oxidation of the hydrogen gas, and raising the temperature of the engine exhaust system downstream of the hydrogen oxidation system, wherein the hydrogen oxidation catalyst includes a platinum group metal supported on zeolite, the hydrogen oxidation catalyst is positioned upstream of one or more of a NO oxidation catalyst, a selective catalytic reduction (SCR) catalyst, an ammonia oxidation (AMOX) catalyst, or any combination thereof, and the N 2 O formation amount of the emissions treatment system is less than 30 ppm, and further provides a method for exotherm.

[0008] The present invention also relates to the use of a hydrogen oxidation catalyst for oxidizing hydrogen gas in an emissions treatment system including a hydrogen injector positioned upstream of the hydrogen oxidation catalyst, wherein the N 2 O formation amount of the emissions treatment system is less than 30 ppm, and the hydrogen oxidation catalyst includes a platinum group metal supported on zeolite.

Brief Description of the Drawings

[0009] To provide an understanding of embodiments of the present disclosure, the accompanying drawings are referred to. The drawings are exemplary and should not be construed as limiting the present disclosure.

Figure 1

Figure 2

Figure 3

[0010] Here, the present disclosure is described more fully. However, the present disclosure may be embodied in many different forms and should not be construed as limited to the embodiments described herein.

[0011] As used herein, the term "a" or "an" entity refers to one or more of that entity; for example, "a catalyst" refers to one or more catalysts or at least one catalyst, unless otherwise specified. Thus, the terms "a" (or "an"), "one or more", and "at least one" are used interchangeably herein.

[0012] As used herein, the term "about" means approximately, nearly, roughly, or around. When the term "about" is used in conjunction with a numerical range, it modifies that range by extending the boundaries above and below the recited numerical values. Generally, the term "about" is used herein to modify the numerical values above and below the recited value by a variation of 10%.

[0013] Most catalysts have a correlation between the amount of H 2 oxidation and the amount of N 2 O formation, while the catalysts of the present disclosure surprisingly have a high H 2Conversion rate and low N 2 It has been surprisingly found in the present disclosure that it exhibits O formation amount.

[0014] In an embodiment, an exhaust gas treatment system for a combustion engine is provided, which includes a hydrogen injector positioned upstream of a hydrogen oxidation catalyst and a NO oxidation catalyst, the hydrogen oxidation catalyst and the NO oxidation catalyst are combined, and the hydrogen oxidation catalyst includes a platinum group metal supported on zeolite.

[0015] In some embodiments, the N 2 O formation amount of the exhaust gas treatment system is less than 30 ppm.

[0016] In an embodiment, a method for heat generation in an engine exhaust system, wherein the engine exhaust system includes an exhaust gas treatment system, the method includes injecting hydrogen gas into the exhaust gas treatment system including a hydrogen injector positioned upstream of a hydrogen oxidation catalyst at a temperature in the range of about 100°C to about 250°C to enable the hydrogen oxidation catalyst to oxidize the hydrogen gas, and raising the temperature of the engine exhaust system downstream of the hydrogen oxidation system, the hydrogen oxidation catalyst includes a platinum group metal supported on zeolite, the hydrogen oxidation catalyst is positioned upstream of a NO oxidation catalyst, a selective catalytic reduction (SCR) catalyst, an ammonia oxidation (AMOX) catalyst, or any combination thereof, and the N 2 O formation amount of the exhaust gas treatment system is less than 30 ppm. A method for heat generation is provided.

[0017] In some embodiments, in the above method, the exhaust gas treatment system includes a hydrogen oxidation catalyst and a NO oxidation catalyst, and the hydrogen oxidation catalyst and the NO oxidation catalyst are combined.

[0018] In some embodiments, in the above method, the H 2 conversion rate of the hydrogen oxidation catalyst is in the range of 80-100%.

[0019] In some embodiments, in the above method, the inlet H to the exhaust gas treatment system 2 concentration is 0.1 to 2%.

[0020] An embodiment is the use of a hydrogen oxidation catalyst for oxidizing hydrogen gas in an exhaust gas treatment system including a hydrogen injector positioned upstream of the hydrogen oxidation catalyst, wherein the NO 2 formation amount of the exhaust gas treatment system is less than 30 ppm, and the hydrogen oxidation catalyst includes a platinum group metal supported on zeolite, relating to the use of a hydrogen oxidation catalyst for oxidizing hydrogen gas.

[0021] In some embodiments relating to the use of the hydrogen oxidation catalyst, the conversion rate of the hydrogen oxidation catalyst 2 is in the range of 80 to 100%.

[0022] In some embodiments relating to the use of the hydrogen oxidation catalyst, the exhaust gas treatment system includes a hydrogen oxidation catalyst and a NO oxidation catalyst, and the hydrogen oxidation catalyst and the NO oxidation catalyst are combined.

[0023] A hydrogen oxidation catalyst for treating exhaust gas of hydrogen from a combustion engine, including a platinum group metal supported on zeolite.

[0024] In some embodiments, the platinum group metal is selected from Pt, Pd, rhodium (Rh), ruthenium (Ru), iridium (Ir), and combinations thereof. In some embodiments, the platinum group metal is Pt. In some embodiments, the platinum group metal is Pd. In some embodiments, the platinum group metal is a combination of Pt and Pd. In some embodiments, the platinum group metal is Rh. In some embodiments, the platinum group metal is Ru. In some embodiments, the platinum group metal is Ir. In some embodiments, the platinum group metal is a combination of Pt and Rh. In some embodiments, the platinum group metal is a combination of Pt and Ru. In some embodiments, the platinum group metal is a combination of Pt and Ir. In some embodiments, the platinum group metal is a combination of Pd and Rh. In some embodiments, the platinum group metal is a combination of Pd and Ru. In some embodiments, the platinum group metal is a combination of Pd and Ir. In some embodiments, the platinum group metal is a combination of Rh and Ru. In some embodiments, the platinum group metal is a combination of Rh and Ir. In some embodiments, the platinum group metal is a combination of Ru and Ir.

[0025] In some embodiments, the zeolite is the H-form of a zeolite selected from structures including FAU, MOR, CHA, FER, * BEA, MFI, (Al 2 O 3 +MFI)+TiO 2 , and combinations thereof. In some embodiments, the zeolite structure is FAU. In some embodiments, the zeolite structure is MOR. In some embodiments, the zeolite structure is CHA. In some embodiments, the zeolite structure is FER. In some embodiments, the zeolite structure is * BEA. In some embodiments, the zeolite structure is MFI. In some embodiments, the zeolite structure is (Al 2 O 3 +MFI)+TiO 2 .

[0026] In some embodiments, the zeolite structure is a combination of FAU and MOR. In some embodiments, the zeolite structure is a combination of FAU and CHA. In some embodiments, the zeolite structure is a combination of FAU and FER. In some embodiments, the zeolite structure is FAU and * a combination with BEA. In some embodiments, the zeolite structure is a combination of FAU and MFI. In some embodiments, the zeolite structure is FAU and (Al 2 O 3 +MFI)+TiO 2 In some embodiments, the zeolite structure is a combination of MOR and CHA. In some embodiments, the zeolite structure is a combination of MOR and FER. In some embodiments, the zeolite structure is MOR and * a combination with BEA. In some embodiments, the zeolite structure is a combination of MOR and MFI. In some embodiments, the zeolite structure is MOR and (Al 2 O 3 +MFI)+TiO 2 In some embodiments, the zeolite structure is a combination of CHA and FER. In some embodiments, the zeolite structure is CHA and * a combination with BEA. In some embodiments, the zeolite structure is a combination of CHA and MFI. In some embodiments, the zeolite structure is CHA and (Al 2 O 3 +MFI)+TiO 2 In some embodiments, the zeolite structure is FER and * a combination with BEA. In some embodiments, the zeolite structure is a combination of FER and MFI. In some embodiments, the zeolite structure is FER and (Al 2 O 3 +MFI)+TiO 2 In some embodiments, the zeolite structure is* A combination of BEA and MFI. In some embodiments, the zeolite structure is * a combination of BEA and (Al 2 O 3 + MFI) + TiO 2 In some embodiments, the zeolite structure is a combination of MFI and (Al 2 O 3 + MFI) + TiO 2 In some embodiments, the hydrogenation catalyst is selected from the group consisting of Pd / Al

[0027] O 2 O 3 , Pd / H-Y, Pd / H-ZSM-5, Pd / H-beta, Pd / MgO, Pd / SiO 2 / Al 2 O 3 , Pd / WO 3 / ZrO 2 , Pd / ZrO 2 , Pd / MgO-CeO 2 , Pd / (Al 2 O 3 + ZSM-5) + TiO 2 , Pd / SiO 2 , Pt / H-ZSM-5, and Pt / H-CHA.

[0028] In some embodiments, the hydrogenation catalyst is Pd / H-Y, Pd / H-ZSM-5, Pd / H-mordenite, Pd / H-beta, Pd / H-chabazite, Pd / H-ferrierite, Pd / (Al 2 O 3 + ZSM-5) + TiO 2 , Pt / H-Y, Pt / H-ZSM-5, Pt / H-mordenite, Pt / beta, Pt / H-chabazite, Pt / H-ferrierite, Pt / (Al 2 O 3 + ZSM-5) + TiO 2 , PtPd / H-Y, PtPd / H-ZSM-5, PtPd / H-mordenite, PtPd / H-beta, PtPd / H-chabazite, PtPd / H-ferrierite, and PtPd / (Al 2 O 3+(ZSM-5)+TiO 2 selected from.

[0029] In some embodiments, the hydrogen oxidation catalyst is Pd / H-Y. In some embodiments, the hydrogen oxidation catalyst is Pd / H-ZSM-5. In some embodiments, the hydrogen oxidation catalyst is Pd / H-mordenite. In some embodiments, the hydrogen oxidation catalyst is Pd / H-beta. In some embodiments, the hydrogen oxidation catalyst is Pd / H-chabazite. In some embodiments, the hydrogen oxidation catalyst is Pd / H-ferrierite. In some embodiments, the hydrogen oxidation catalyst is Pd / (Al 2 O 3 +(ZSM-5)+TiO 2 is. In some embodiments, the hydrogen oxidation catalyst is Pt / H-Y. In some embodiments, the hydrogen oxidation catalyst is Pt / H-ZSM-5. In some embodiments, the hydrogen oxidation catalyst is Pt / H-mordenite. In some embodiments, the hydrogen oxidation catalyst is Pt / H-beta. In some embodiments, the hydrogen oxidation catalyst is Pt / H-chabazite. In some embodiments, the hydrogen oxidation catalyst is Pt / H-ferrierite. In some embodiments, the hydrogen oxidation catalyst is Pt / (Al 2 O 3 +(ZSM-5)+TiO 2 is. In some embodiments, the hydrogen oxidation catalyst is PtPd / H-Y. In some embodiments, the hydrogen oxidation catalyst is PtPd / H-ZSM-5. In some embodiments, the hydrogen oxidation catalyst is PtPd / H-mordenite. In some embodiments, the hydrogen oxidation catalyst is PtPd / H-beta. In some embodiments, the hydrogen oxidation catalyst is PtPd / H-chabazite. In some embodiments, the hydrogen oxidation catalyst is PtPd / H-ferrierite. In some embodiments, the hydrogen oxidation catalyst is PtPd / (Al 2 O 3 +(ZSM-5)+TiO 2 is.

[0030] In some embodiments, the Pt:Pd weight ratio is selected from 8:1, 4:1, and 2:1. In some embodiments, the Pt:Pd weight ratio is 8:1. In some embodiments, the Pt:Pd weight ratio is 4:1. In some embodiments, the Pt:Pd weight ratio is 2:1.

[0031] The present disclosure provides a hydrogen oxidation catalyst for the exhaust gas treatment of hydrogen from a combustion engine. In some embodiments, the hydrogen oxidation catalyst comprises platinum (Pt), palladium (Pd), or a combination thereof supported on an oxide or mixed oxide.

[0032] In some embodiments, the oxide or mixed oxide is Al 2 O 3 , SiO 2 , CeO 2 , TiO 2 , ZrO 2 , MgO, WO 3 , and mixtures thereof. In some embodiments, the oxide or mixed oxide is Al 2 O 3 . In some embodiments, the oxide or mixed oxide is SiO 2 . In some embodiments, the oxide or mixed oxide is CeO 2 . In some embodiments, the oxide or mixed oxide is TiO 2 . In some embodiments, the oxide or mixed oxide is ZrO 2 . In some embodiments, the oxide or mixed oxide is MgO. In some embodiments, the oxide or mixed oxide is WO 3 . In some embodiments, the oxide or mixed oxide is Al 2 O 3 / SiO 2 . In some embodiments, the oxide or mixed oxide is Al 2 O 3 / CeO 2 . In some embodiments, the oxide or mixed oxide is Al 2 O 3 / TiO 2It is. In some embodiments, the oxide or mixed oxide is Al 2 O 3 / ZrO 2 It is. In some embodiments, the oxide or mixed oxide is Al 2 O 3 / MgO, Al 2 O 3 / WO 3 It is. In some embodiments, the oxide or mixed oxide is SiO 2 / CeO 2 It is. In some embodiments, the oxide or mixed oxide is SiO 2 / TiO 2 It is. In some embodiments, the oxide or mixed oxide is SiO 2 / ZrO 2 It is. In some embodiments, the oxide or mixed oxide is SiO 2 / MgO. In some embodiments, the oxide or mixed oxide is SiO 2 / WO 3 It is. In some embodiments, the oxide or mixed oxide is CeO 2 / TiO 2 It is. In some embodiments, the oxide or mixed oxide is CeO 2 / ZrO 2 It is. In some embodiments, the oxide or mixed oxide is CeO 2 / MgO. In some embodiments, the oxide or mixed oxide is CeO 2 / WO 3 It is. In some embodiments, the oxide or mixed oxide is TiO 2 / ZrO 2 It is. In some embodiments, the oxide or mixed oxide is TiO 2 / MgO. In some embodiments, the oxide or mixed oxide is TiO 2 / WO 3 It is. In some embodiments, the oxide or mixed oxide is ZrO 2 / MgO. In some embodiments, the oxide or mixed oxide is ZrO 2 / WO 3It is. In some embodiments, the oxide or mixed oxide is MgO / WO 3 It is.

[0033] In some embodiments, the hydrogen oxidation catalyst is Pd / Al 2 O 3 , Pd / MgO, Pd / SiO 2 / Al 2 O 3 , Pd / WO 3 / ZrO 2 , Pd / ZrO 2 , Pd / MgO-CeO 2 , Pd / SiO 2 , Pt / Al 2 O 3 , Pt / MgO, Pt / SiO 2 / Al 2 O 3 , Pt / WO 3 / ZrO 2 , Pt / ZrO 2 , Pt / MgO-CeO 2 , Pt / SiO 2 , PtPd / Al 2 O 3 , PtPd / MgO, PtPd / SiO 2 / Al 2 O 3 , PtPd / WO 3 / ZrO 2 , PtPd / ZrO 2 , PtPd / MgO-CeO 2 , and PtPd / SiO 2 selected from.

[0034] In some embodiments, the hydrogen oxidation catalyst is Pd / Al 2 O 3 It is. In some embodiments, the hydrogen oxidation catalyst is Pd / MgO. In some embodiments, the hydrogen oxidation catalyst is Pd / SiO 2 / Al 2 O 3 It is. In some embodiments, the hydrogen oxidation catalyst is Pd / WO 3 / ZrO 2 It is. In some embodiments, the hydrogen oxidation catalyst is Pd / ZrO 2It is. In some embodiments, the hydrogen oxidation catalyst is Pd / MgO-CeO 2 It is. In some embodiments, the hydrogen oxidation catalyst is Pd / SiO 2 It is. In some embodiments, the hydrogen oxidation catalyst is Pt / Al 2 O 3 It is. In some embodiments, the hydrogen oxidation catalyst is Pt / MgO. In some embodiments, the hydrogen oxidation catalyst is Pt / SiO 2 / Al 2 O 3 It is. In some embodiments, the hydrogen oxidation catalyst is Pt / WO 3 / ZrO 2 It is. In some embodiments, the hydrogen oxidation catalyst is Pt / ZrO 2 It is. In some embodiments, the hydrogen oxidation catalyst is Pt / MgO-CeO 2 It is. In some embodiments, the hydrogen oxidation catalyst is Pt / SiO 2 It is. In some embodiments, the hydrogen oxidation catalyst is PtPd / Al 2 O 3 It is. In some embodiments, the hydrogen oxidation catalyst is PtPd / MgO. In some embodiments, the hydrogen oxidation catalyst is PtPd / SiO 2 / Al 2 O 3 It is. In some embodiments, the hydrogen oxidation catalyst is PtPd / WO 3 / ZrO 2 It is. In some embodiments, the hydrogen oxidation catalyst is PtPd / ZrO 2 It is. In some embodiments, the hydrogen oxidation catalyst is PtPd / MgO-CeO 2 It is. In some embodiments, the hydrogen oxidation catalyst is PtPd / SiO 2 It is.

[0035] The present disclosure provides an emissions treatment system for a combustion engine. In some embodiments, the emissions treatment system includes a hydrogen injector positioned upstream of a hydrogen oxidation catalyst disclosed in the present invention. In some embodiments, the hydrogen oxidation catalyst is positioned upstream of one or more of a NO oxidation catalyst, a selective catalytic reduction (SCR) catalyst, an ammonia oxidation (AMOX) catalyst, or any combination thereof.

[0036] In some embodiments, the hydrogen oxidation catalyst is positioned upstream of the NO oxidation catalyst. In some embodiments, the hydrogen oxidation catalyst and the NO oxidation catalyst are combined.

[0037] In some embodiments, the hydrogen oxidation catalyst is positioned upstream of the selective catalytic reduction (SCR) catalyst.

[0038] In some embodiments, the hydrogen oxidation catalyst is positioned upstream of the ammonia oxidation (AMOX) catalyst.

[0039] In some embodiments, the hydrogen oxidation catalyst is positioned upstream of a combination of the selective catalytic reduction (SCR) catalyst and the ammonia oxidation (AMOX) catalyst.

[0040] The present disclosure also provides a method for heat generation in an engine exhaust system. In some embodiments, the method includes injecting hydrogen gas into an emissions treatment system as described herein. In some embodiments, the emissions treatment system is at a temperature in the range of about 100°C to about 250°C. In some embodiments, the emissions treatment system is at a temperature of about 100°C. In some embodiments, the emissions treatment system is at a temperature of about 110°C. In some embodiments, the emissions treatment system is at a temperature of about 120°C. In some embodiments, the emissions treatment system is at a temperature of about 130°C. In some embodiments, the emissions treatment system is at a temperature of about 140°C. In some embodiments, the emissions treatment system is at a temperature of about 150°C. In some embodiments, the emissions treatment system is at a temperature of about 160°C. In some embodiments, the emissions treatment system is at a temperature of about 170°C. In some embodiments, the emissions treatment system is at a temperature of about 180°C. In some embodiments, the emissions treatment system is at a temperature of about 190°C. In some embodiments, the emissions treatment system is at a temperature of about 200°C. In some embodiments, the emissions treatment system is at a temperature of about 210°C. In some embodiments, the emissions treatment system is at a temperature of about 220°C. In some embodiments, the emissions treatment system is at a temperature of about 230°C. In some embodiments, the emissions treatment system is at a temperature of about 240°C. In some embodiments, the emissions treatment system is at a temperature of about 250°C.

[0041] In some embodiments, the hydrogen oxidation catalyst oxidizes hydrogen gas and raises the temperature of the engine exhaust system downstream of the hydrogen oxidation system.

[0042] Before describing exemplary embodiments of the present disclosure, it is to be understood that the present disclosure is not limited to the details of the structures or process steps described in the following examples, that other embodiments are possible, and that the present disclosure can be practiced or carried out in various ways.

Examples

[0043] The following examples are intended to be illustrative and are not meant to limit the scope of the present disclosure in any way.

[0044] As illustrated in FIG. 1, the hydrogen oxidation catalyst (HOC) of the present disclosure can be configured in various emissions control systems that include additional components such as a selective catalytic reduction (SCR) catalyst, a selective ammonia oxidation catalyst (AMOX), and / or a NO oxidation catalyst. For example, the emissions control system can be configured as (i) HOC→SCR or SCR / AMOX, (ii) HOC→NOC→SCR or SCR / AMOX, or (iii) HOC / NOC→SCR or SCR / AMOX.

[0045] Catalyst Preparation Procedure Preparation Method 1 (Single Metal Catalyst): For the Pt catalyst, a Pt amine hydroxide solution was impregnated onto a commercially available catalyst support using the incipient wetness technique to achieve the desired metal loading. For the Pd, Ru, Rh, and Ir catalysts, the corresponding nitrate solutions were used for impregnation. The impregnated metal / support powder was then calcined in air at 500 °C for 2 hours. To form samples for reactor testing, the calcined powder was dispersed in deionized water at a solids content of approximately 30%, and an alumina binder (5% of the catalyst) was added to this slurry. The slurry was continuously stirred until dry. The dried powder was further calcined in air at 450 °C for 2 hours, then crushed and sieved to a 250 - 500 micrometer fraction. Prior to reactor testing, the sieved fraction was aged in air with 10% steam at 750 °C for 20 hours.

[0046] Preparation Method 2 (Pt / Pd Catalyst): For the Pt / Pd bimetallic catalyst, a Pd nitrate solution was first impregnated into the support powder to achieve 100% initial wetness. This Pd-impregnated powder was dried at 100 °C before Pt impregnation. Then, using the same method as in Method 1, this Pd / support powder was impregnated with Pt and dried at 100 °C. Next, the Pt / Pd powder was calcined in air at 450 °C for 2 hours. The sample forming method and aging conditions are the same as those described in Method 1.

[0047] Preparation Method 3 (TiO 2 -ZrO 2 above PGM): TiO 2 -ZrO 2 The support was synthesized by co-precipitating a mixture of Ti(OPr) 4 and ZrO(NO 4 ) 3 2 (Ti / Zr molar ratio = 1:1) using an NH

[0048] OH solution. Then, the precipitated solution was evaporated to dryness. The resulting solid product was calcined in air at 450 °C. Metal impregnation, sample forming, and catalyst aging were carried out in the same manner as described in Method 1. 2 above PGM): MgO-CeO 2 The support was prepared by the sol-gel method using Mg(EtO) 2 and Ce(NO 3 ) 3 (Mg / Ce molar ratio = 1:1) as precursors. The resulting solid was calcined in air at 600 °C for 4 hours. Pt or Pd impregnation was carried out using the same method as described in Method 1. The sample forming method and aging conditions are the same as those described in Method 1.

[0049] Preparation Method 5 (sulfated MgO-CeO 2 above PGM): Method 5 is the same as Method 4 except that a sulfation treatment was carried out before metal impregnation. MgO-CeO 2 ​The carrier was treated at 300 °C for 20 hours using a flowing stream of 20 ppm SO in air. The sample forming method and aging conditions were the same as those described in Method 1. 2

[0050] Preparation Method 6 (WO 3 / ZrO 2 PGM above): (NH 4 ) 6 H 2 W 12 O 41 solution was impregnated onto a commercially available ZrO 2 carrier using the incipient wetness technique to produce the carrier material WO 3 / ZrO 2 (10% WO 3 ). The resulting powder was dried overnight at 110 °C in air and calcined at 500 °C for 2 hours before impregnation with Pt or Pd. The sample forming method and aging conditions were the same as those described in Method 1.

[0051] Manufacturing Method 7 (Pd / (Al 2 O 3 +ZSM-5)+TiO 2 ): Pd / (Al 2 O 3 +ZSM-5)+TiO 2 catalyst was prepared by impregnating a mixture of Al 2 O 3 and ZSM-5 zeolite (3:1 by weight) with Pd nitrate using the procedure described in Method 1. TiO 2 O 3 was added to this Pd / (Al 2 O 2 +ZSM-5) material (20 wt% TiO

[0052] Catalyst Performance Evaluation Procedure The catalyst performance was evaluated using a high-throughput reactor under steady-state conditions. For each experiment, 0.2 g of the sample was used at a flow rate of 50 L / min, which, assuming a washcoat loading of 2 g / in 3 corresponds to a monolithic GHSV of 30,000 h -1 . Two types of measurements were performed: (1) performance as a function of the inlet hydrogen concentration, and (2) performance as a function of the reaction temperature. For type 1, variable H 2 (0.2, 0.4, 0.6, 0.8, and 1%), 200 ppm of NO, 5% of O 2 , 5% of H 2 O, and the balance N 2 were used to perform the measurements at 125 °C. For type 2, the feed gas consisted of 1% H 2 , 200 ppm of NO, 5% of O 2 , 5% of H 2 O, and the balance N 2 , and the performance was measured at 100, 125, 150, 175, and 200, 250, and 350 °C. The H 2 conversion was defined as (inlet H 2 concentration - outlet H 2 concentration) / inlet H 2 concentration × 100%.

[0053] The catalyst compositions of the present disclosure are described in Tables 1 and 2 shown below. The performance of the catalyst compositions in Table 1 is shown in Tables 3, 4, and Figure 2. The performance of the catalyst compositions in Table 2 is shown in Tables 5, 6, and Figure 3.

[0054]

Table 1

[0055] The catalysts listed in Table 1 include various platinum group metals (PGMs) such as platinum (Pt), palladium (Pd), rhodium (Rh), ruthenium (Ru), and iridium (Ir) supported on an oxide or mixed oxide support. The table also includes selected Pt and Pd catalysts supported on zeolite. The SAR following the zeolite name is SiO2 and Al 2 O 3 is the molar ratio with. SAR30 means SiO 2 / Al 2 O 3 = 30.

[0056] [Table 2]

[0057] Table 2 lists the Pt, Pd, and PtPd catalyst supports on various zeolites. The table also lists the ranges of Pt / Pd ratios for some catalyst compositions, such as Pt / Pd ratios of 8:1, 4:1, and 2:1.

[0058] [Table 3]

[0059] Table 3 shows the H 2 conversion and N 2 formation amounts of the Matrix I samples (shown in Table 1) conducted at 125 °C as a function of the inlet H 2 concentration (0.2%, 0.4%, 0.6%, and 0.8%).

[0060] [Table 4]

[0061] Table 4 shows the H 2 conversion and N 2 formation amounts of the Matrix I samples (Table 1) with an inlet hydrogen concentration of 1% as a function of the catalyst inlet temperature (125 °C, 150 °C, 175 °C, and 200 °C).

[0062] [Table 5]

[0063] Table 5 shows the inlet H 2H of Matrix II samples (shown in Table 2) conducted at 125 °C as a function of concentration (0.2%, 0.4%, 0.6%, and 0.8%) 2 Conversion rate and N 2 O formation amount is shown.

[0064]

Table 6

[0065] Table 6 shows the H of Matrix II samples (Table 2) with an inlet hydrogen concentration of 1% as a function of catalyst inlet temperature (125 °C, 150 °C, 175 °C, and 200 °C) 2 Conversion rate and N 2 O oxide formation amount is shown.

[0066] The performance results of the samples shown in Table 1 summarized in Table 4 are the average N over four temperatures (125, 150, 175, and 200 °C) at an inlet H 2 Concentration and average H 2 Is summarized in Figure 2 as the correlation between the O formation amount and the average H 2 Conversion rate. Figure 2 shows that within a specific performance boundary (80 - 100% H 2 Conversion rate and N less than 30 ppm 2 O), for example, catalysts such as Pd / Al 2 O 3 , Pd / H - Y, Pd / H - ZSM - 5, Pd / H - Beta, Pd / MgO, Pd / SiO 2 / Al 2 O 3 , Pd / WO 3 / ZrO 2 , Pd / ZrO 2 , Pd / MgO - CeO 2 , Pd / (Al 2 O 3 +ZSM - 5)+TiO 2 , Pd / SiO 2 , Pt / H - ZSM - 5, and Pt / H - CHA show enhanced catalyst performance.

[0067] The performance results of the samples shown in Table 2 summarized in Table 6 are the inlet H of 1%2 The average N over four temperatures (125, 150, 175, and 200 °C) at the concentration 2 O formation amount and the average H 2 The correlation between the conversion rate is summarized in Figure 3. Figure 3 shows Pt, Pd, and Pt / Pd catalysts supported on zeolites such as Y, FER, MOR, CHA, * BEA, and MFI are very active for hydrogen oxidation with a conversion rate of 80 - 100% and an N 2 O formation amount of less than 30 ppm.

[0068] Embodiments The present invention is further illustrated by the following set of embodiments and combinations of embodiments resulting from the dependencies and cross-references as shown. In particular, in each case where the scope of an embodiment is referred to, for example, in the context of a term such as "any one of the catalysts of Embodiments 1 to 4", all embodiments within this scope are meant to be explicitly disclosed to those skilled in the art, that is, it should be noted that this expression of the term is understood by those skilled in the art to be synonymous with "any one of the catalysts of Embodiments 1, 2, 3, and 4". Further, it should be explicitly noted that the following series of embodiments represent a preferably structured part of the description directed to the general and preferred aspects of the present invention, rather than a series of claims defining the scope of protection. 1. A hydrogen oxidation catalyst for exhaust gas treatment of hydrogen from a combustion engine, comprising a platinum group metal supported on a zeolite. 2. The hydrogen oxidation catalyst according to Embodiment 1, wherein the platinum group metal is selected from Pt, Pd, rhodium (Rh), ruthenium (Ru), iridium (Ir), or a combination thereof. 3. The hydrogen oxidation catalyst according to Embodiment 1, wherein the platinum group metal is Pt. 4. The hydrogen oxidation catalyst according to Embodiment 1, wherein the platinum group metal is Pd. 5. The hydrogen oxidation catalyst according to Embodiment 1, wherein the platinum group metal is a combination of Pt and Pd. 6. The hydrogen oxidation catalyst according to Embodiment 1, wherein the platinum group metal is Rh. 7. The hydrogen oxidation catalyst according to Embodiment 1, wherein the platinum group metal is Ru. 8. The hydrogen oxidation catalyst according to Embodiment 1, wherein the platinum group metal is Ir. 9. The hydrogen oxidation catalyst according to any one of Embodiments 1 to 8, wherein the zeolite is an H-type zeolite selected from structures including FAU, MOR, CHA, FER, * BEA, MFI, (Al 2 O 3 +MFI)+TiO 2 , and combinations thereof. 10. The hydrogen oxidation catalyst according to Embodiment 9, wherein the zeolite structure is FAU. 11. The hydrogen oxidation catalyst according to Embodiment 9, wherein the zeolite structure is MOR. 12. The hydrogen oxidation catalyst according to Embodiment 9, wherein the zeolite structure is CHA. 13. The hydrogen oxidation catalyst according to Embodiment 9, wherein the zeolite structure is FER. 14. The zeolite structure is * BEA, the hydrogen oxidation catalyst according to Embodiment 9. 15. The hydrogen oxidation catalyst according to Embodiment 9, wherein the zeolite structure is MFI. 16. The zeolite structure is (Al 2 O 3 +MFI)+TiO 2 , the hydrogen oxidation catalyst according to Embodiment 9. 17. The hydrogen oxidation catalyst is Pd / H-Y, Pd / H-ZSM-5, Pd / H-mordenite, Pd / H-beta, Pd / H-chabazite, Pd / H-ferrierite, Pd / (Al 2 O 3 +ZSM-5)+TiO 2 , Pt / H-Y, Pt / H-ZSM-5, Pt / H-mordenite, Pt / H-beta, Pt / H-chabazite, Pt / H-ferrierite, Pt / (Al 2 O 3 +ZSM-5)+TiO 2 , PtPd / H-Y, PtPd / H-ZSM-5, PtPd / H-mordenite, PtPd / H-beta, PtPd / H-chabazite, PtPd / H-ferrierite, and PtPd / (Al2 O 3 + ZSM-5) + TiO 2 The hydrogen oxidation catalyst according to any one of Embodiments 1 to 16, selected from 18. The hydrogen oxidation catalyst according to any one of Embodiments 1 to 16, wherein the hydrogen oxidation catalyst is Pd / H-Y. 19. The hydrogen oxidation catalyst according to any one of Embodiments 1 to 16, wherein the hydrogen oxidation catalyst is Pd / H-ZSM-5. 20. The hydrogen oxidation catalyst according to any one of Embodiments 1 to 16, wherein the hydrogen oxidation catalyst is Pd / H-mordenite. 21. The hydrogen oxidation catalyst according to any one of Embodiments 1 to 16, wherein the hydrogen oxidation catalyst is Pd / H-beta. 22. The hydrogen oxidation catalyst according to any one of Embodiments 1 to 16, wherein the hydrogen oxidation catalyst is Pd / H-chabazite. 23. The hydrogen oxidation catalyst according to any one of Embodiments 1 to 16, wherein the hydrogen oxidation catalyst is Pd / H-ferrierite. 24. The hydrogen oxidation catalyst according to any one of Embodiments 1 to 16, wherein the hydrogen oxidation catalyst is Pd / (Al 2 O 3 + ZSM-5) + TiO 2 The hydrogen oxidation catalyst according to any one of Embodiments 1 to 16. 25. The hydrogen oxidation catalyst according to any one of Embodiments 1 to 16, wherein the hydrogen oxidation catalyst is Pt / H-Y. 26. The hydrogen oxidation catalyst according to any one of Embodiments 1 to 16, wherein the hydrogen oxidation catalyst is Pt / H-ZSM-5. 27. The hydrogen oxidation catalyst according to any one of Embodiments 1 to 16, wherein the hydrogen oxidation catalyst is Pt / H-mordenite. 28. The hydrogen oxidation catalyst according to any one of Embodiments 1 to 16, wherein the hydrogen oxidation catalyst is Pt / H-beta. 29. The hydrogen oxidation catalyst according to any one of Embodiments 1 to 16, wherein the hydrogen oxidation catalyst is Pt / H-chabazite. 30. The hydrogen oxidation catalyst according to any one of Embodiments 1 to 16, wherein the hydrogen oxidation catalyst is Pt / H-ferrierite. 31. The hydrogen oxidation catalyst according to any one of Embodiments 1 to 16, wherein the hydrogen oxidation catalyst is Pt / (Al 2O 3 +(ZSM-5)+TiO 2 The hydrogen oxidation catalyst according to any one of Embodiments 1 to 16, which is as described above. 32. The hydrogen oxidation catalyst according to any one of Embodiments 1 to 16, wherein the hydrogen oxidation catalyst is PtPd / H-Y. 33. The hydrogen oxidation catalyst according to any one of Embodiments 1 to 16, wherein the hydrogen oxidation catalyst is PtPd / H-ZSM-5. 34. The hydrogen oxidation catalyst according to any one of Embodiments 1 to 16, wherein the hydrogen oxidation catalyst is PtPd / H-mordenite. 35. The hydrogen oxidation catalyst according to any one of Embodiments 1 to 16, wherein the hydrogen oxidation catalyst is PtPd / H-beta. 36. The hydrogen oxidation catalyst according to any one of Embodiments 1 to 16, wherein the hydrogen oxidation catalyst is PtPd / H-chabazite. 37. The hydrogen oxidation catalyst according to any one of Embodiments 1 to 16, wherein the hydrogen oxidation catalyst is PtPd / H-ferrierite. 38. The hydrogen oxidation catalyst, wherein the hydrogen oxidation catalyst is PtPd / (Al 2 O 3 +(ZSM-5)+TiO 2 The hydrogen oxidation catalyst according to any one of Embodiments 1 to 16, which is as described above. 39. The hydrogen oxidation catalyst according to any one of Embodiments 1 to 16 and 32 to 38, wherein the Pt:Pd weight ratio is selected from 8:1, 4:1, and 2:1. 40. The hydrogen oxidation catalyst according to any one of Embodiments 1 to 16 and 32 to 38, wherein the Pt:Pd weight ratio is 8:1. 41. The hydrogen oxidation catalyst according to any one of Embodiments 1 to 16 and 32 to 38, wherein the Pt:Pd weight ratio is 4:1. 42. The hydrogen oxidation catalyst according to any one of Embodiments 1 to 16 and 32 to 38, wherein the Pt:Pd weight ratio is 2:1. 43. A hydrogen oxidation catalyst for treating exhaust gas of hydrogen from a combustion engine, which comprises platinum (Pt), palladium (Pd), or a combination thereof supported on an oxide or a mixed oxide. 44. The oxide or mixed oxide is Al 2 O3 , SiO 2 , CeO 2 , TiO 2 , ZrO 2 , MgO, WO 3 , and a hydrogen oxidation catalyst according to embodiment 43 selected from these mixtures. 45. An oxide or mixed oxide is Al 2 O 3 , a hydrogen oxidation catalyst according to embodiment 43 or 44. 46. An oxide or mixed oxide is SiO 2 , a hydrogen oxidation catalyst according to embodiment 43 or 44. 47. An oxide or mixed oxide is CeO 2 , a hydrogen oxidation catalyst according to embodiment 43 or 44. 48. An oxide or mixed oxide is TiO 2 , a hydrogen oxidation catalyst according to embodiment 43 or 44. 49. An oxide or mixed oxide is ZrO 2 , a hydrogen oxidation catalyst according to embodiment 43 or 44. 50. An oxide or mixed oxide is MgO, a hydrogen oxidation catalyst according to embodiment 43 or 44. 51. An oxide or mixed oxide is WO 3 , a hydrogen oxidation catalyst according to embodiment 43 or 44. 52. An oxide or mixed oxide is Al 2 O 3 / SiO 2 , a hydrogen oxidation catalyst according to embodiment 43 or 44. 53. An oxide or mixed oxide is WO 3 / ZrO 2 , a hydrogen oxidation catalyst according to embodiment 43 or 44. 54. An oxide or mixed oxide is MgO / CeO 2 , a hydrogen oxidation catalyst according to embodiment 43 or 44. 55. An oxide or mixed oxide is WO 3 / ZrO 2 , a hydrogen oxidation catalyst according to embodiment 43 or 44. 56. The hydrogen oxidation catalyst is Pd / Al 2 O3 , Pd / MgO, Pd / SiO 2 / Al 2 O 3 , Pd / WO 3 / ZrO 2 , Pd / ZrO 2 , Pd / MgO-CeO 2 , Pd / SiO 2 , Pt / Al 2 O 3 , Pt / MgO, Pt / SiO 2 / Al 2 O 3 , Pt / WO 3 / ZrO 2 , Pt / ZrO 2 , Pt / MgO-CeO 2 , Pt / SiO 2 , PtPd / Al 2 O 3 , PtPd / MgO, PtPd / SiO 2 / Al 2 O 3 , PtPd / WO 3 / ZrO 2 , PtPd / ZrO 2 , PtPd / MgO-CeO 2 , and PtPd / SiO 2 The hydrogen oxidation catalyst according to any one of Embodiments 43 to 55, selected from 57. The hydrogen oxidation catalyst according to any one of Embodiments 43 to 55, wherein the hydrogen oxidation catalyst is Pd / Al 2 O 3 . 58. The hydrogen oxidation catalyst according to any one of Embodiments 43 to 55, wherein the hydrogen oxidation catalyst is Pd / MgO. 59. The hydrogen oxidation catalyst according to any one of Embodiments 43 to 55, wherein the hydrogen oxidation catalyst is Pd / SiO 2 / Al 2 O 3 . 60. The hydrogen oxidation catalyst according to any one of Embodiments 43 to 55, wherein the hydrogen oxidation catalyst is Pd / WO 3 / ZrO 2 . 61. The hydrogen oxidation catalyst according to any one of Embodiments 43 to 55, wherein the hydrogen oxidation catalyst is Pd / ZrO 2The hydrogen oxidation catalyst according to any one of Embodiments 43 to 55. 62. The hydrogen oxidation catalyst is Pd / MgO-CeO 2 The hydrogen oxidation catalyst according to any one of Embodiments 43 to 55. 63. The hydrogen oxidation catalyst is Pd / SiO 2 The hydrogen oxidation catalyst according to any one of Embodiments 43 to 55. 64. The hydrogen oxidation catalyst is Pt / Al 2 O 3 The hydrogen oxidation catalyst according to any one of Embodiments 43 to 55. 65. The hydrogen oxidation catalyst is Pt / MgO, the hydrogen oxidation catalyst according to any one of Embodiments 43 to 55. 66. The hydrogen oxidation catalyst is Pt / SiO 2 / Al 2 O 3 The hydrogen oxidation catalyst according to any one of Embodiments 43 to 55. 67. The hydrogen oxidation catalyst is Pt / WO 3 / ZrO 2 The hydrogen oxidation catalyst according to any one of Embodiments 43 to 55. 68. The hydrogen oxidation catalyst is Pt / ZrO 2 The hydrogen oxidation catalyst according to any one of Embodiments 43 to 55. 69. The hydrogen oxidation catalyst is Pt / MgO-CeO 2 The hydrogen oxidation catalyst according to any one of Embodiments 43 to 55. 70. The hydrogen oxidation catalyst is Pt / SiO 2 The hydrogen oxidation catalyst according to any one of Embodiments 43 to 55. 71. The hydrogen oxidation catalyst is PtPd / Al 2 O 3 The hydrogen oxidation catalyst according to any one of Embodiments 43 to 55. 72. The hydrogen oxidation catalyst is PtPd / MgO, the hydrogen oxidation catalyst according to any one of Embodiments 43 to 55. 73. The hydrogen oxidation catalyst is PtPd / SiO 2 / Al 2 O 3The hydrogen oxidation catalyst according to any one of Embodiments 43 to 55. 74. The hydrogen oxidation catalyst is PtPd / WO 3 / ZrO 2 The hydrogen oxidation catalyst according to any one of Embodiments 43 to 55. 75. The hydrogen oxidation catalyst is PtPd / ZrO 2 The hydrogen oxidation catalyst according to any one of Embodiments 43 to 55. 76. The hydrogen oxidation catalyst is PtPd / MgO-CeO 2 The hydrogen oxidation catalyst according to any one of Embodiments 43 to 55. 77. The hydrogen oxidation catalyst is PtPd / SiO 2 The hydrogen oxidation catalyst according to any one of Embodiments 43 to 55. 78. The hydrogen oxidation catalyst according to any one of Claims 43 to 77, wherein the Pt:Pd weight ratio is selected from 8:1, 4:1, and 2:1. 79. The hydrogen oxidation catalyst according to any one of Embodiments 43 to 77, wherein the Pt:Pd weight ratio is selected from 8:1, 4:1, and 2:1. 80. The hydrogen oxidation catalyst according to any one of Embodiments 43 to 77, wherein the Pt:Pd weight ratio is 8:1. 81. The hydrogen oxidation catalyst according to any one of Embodiments 43 to 77, wherein the Pt:Pd weight ratio is 4:1. 82. The hydrogen oxidation catalyst according to any one of Embodiments 43 to 77, wherein the Pt:Pd weight ratio is 2:1. 83. An exhaust gas treatment system for a combustion engine, comprising a hydrogen injector positioned upstream of the hydrogen oxidation catalyst according to any one of Embodiments 1 to 82, wherein the hydrogen oxidation catalyst is positioned upstream of a NO oxidation catalyst, a selective catalytic reduction (SCR) catalyst, an ammonia oxidation (AMOX) catalyst, or any combination thereof. 84. An exhaust gas treatment system for a combustion engine, comprising a hydrogen injector positioned upstream of the hydrogen oxidation catalyst according to any one of Embodiments 1 to 82, wherein the hydrogen oxidation catalyst is positioned upstream of a NO oxidation catalyst. 85. An exhaust gas treatment system for a combustion engine, comprising a hydrogen injector positioned upstream of the hydrogen oxidation catalyst according to any one of Embodiments 1 to 82, wherein the hydrogen oxidation catalyst is positioned upstream of a selective catalytic reduction (SCR) catalyst. An exhaust gas treatment system for a combustion engine. 86. An exhaust gas treatment system for a combustion engine, comprising a hydrogen injector positioned upstream of the hydrogen oxidation catalyst according to any one of Embodiments 1 to 82, wherein the hydrogen oxidation catalyst is positioned upstream of an ammonia oxidation (AMOX) catalyst. An exhaust gas treatment system for a combustion engine. 87. An exhaust gas treatment system for a combustion engine, comprising a hydrogen injector positioned upstream of the hydrogen oxidation catalyst according to any one of Embodiments 1 to 82, wherein the hydrogen oxidation catalyst is positioned upstream of a combination of a selective catalytic reduction (SCR) catalyst and an ammonia oxidation (AMOX) catalyst. An exhaust gas treatment system for a combustion engine. 88. A method for heat generation in an engine exhaust system, comprising injecting hydrogen gas into the exhaust gas treatment system according to any one of Embodiments 83 to 87 at a temperature in the range of about 100°C to about 250°C to enable the hydrogen oxidation catalyst to oxidize the hydrogen gas, and increasing the temperature of the engine exhaust system downstream of the hydrogen oxidation system. A method for heat generation. 89. A method for heat generation in an engine exhaust system, comprising injecting hydrogen gas into the exhaust gas treatment system according to any one of Embodiments 83 to 87 at a temperature of about 100°C to enable the hydrogen oxidation catalyst to oxidize the hydrogen gas, and increasing the temperature of the engine exhaust system downstream of the hydrogen oxidation system. A method for heat generation. 90. A method for heat generation in an engine exhaust system, comprising injecting hydrogen gas into the exhaust gas treatment system according to any one of Embodiments 83 to 87 at a temperature of about 150°C to enable the hydrogen oxidation catalyst to oxidize the hydrogen gas, and increasing the temperature of the engine exhaust system downstream of the hydrogen oxidation system. A method for heat generation. 91. A method for heat generation in an engine exhaust system, comprising injecting hydrogen gas into the exhaust gas treatment system according to any one of Embodiments 83 to 87 at a temperature of about 200 °C to enable a hydrogen oxidation catalyst to oxidize the hydrogen gas, and raising the temperature of the engine exhaust system downstream of the hydrogen oxidation system. 92. A method for heat generation in an engine exhaust system, comprising injecting hydrogen gas into the exhaust gas treatment system according to any one of Embodiments 83 to 87 at a temperature of about 250 °C to enable a hydrogen oxidation catalyst to oxidize the hydrogen gas, and raising the temperature of the engine exhaust system downstream of the hydrogen oxidation system. 93. An exhaust gas treatment system for a combustion engine, comprising a hydrogen injector positioned upstream of a hydrogen oxidation catalyst and a NO oxidation catalyst, wherein the hydrogen oxidation catalyst and the NO oxidation catalyst are combined, and the hydrogen oxidation catalyst comprises a platinum group metal supported on zeolite. 94. The exhaust gas treatment system for a combustion engine according to Embodiment 93, wherein the hydrogen oxidation catalyst is selected from the group consisting of Pd / Al 2 O 3 , Pd / H-Y, Pd / H-ZSM-5, Pd / H-beta, Pd / MgO, Pd / SiO 2 / Al 2 O 3 , Pd / WO 3 / ZrO 2 , Pd / ZrO 2 , Pd / MgO-CeO 2 , Pd / (Al 2 O 3 +ZSM-5)+TiO 2 , Pd / SiO 2 , Pt / H-ZSM-5, and Pt / H-CHA. 95. The exhaust gas treatment system for a combustion engine according to Embodiment 93 or 94, wherein the NO formation amount of the exhaust gas treatment system is less than 30 ppm. 2 96. A method for heat generation in an engine exhaust system, wherein the engine exhaust system includes an emissions treatment system, and the method includes injecting hydrogen gas into the emissions treatment system, which includes a hydrogen injector positioned upstream of a hydrogen oxidation catalyst, at a temperature in the range of about 100°C to about 250°C, enabling the hydrogen oxidation catalyst to oxidize the hydrogen gas, and raising the temperature of the engine exhaust system downstream of the hydrogen oxidation system. The hydrogen oxidation catalyst includes a platinum group metal supported on zeolite. The hydrogen oxidation catalyst is positioned upstream of one or more of a NO oxidation catalyst, a selective catalytic reduction (SCR) catalyst, an ammonia oxidation (AMOX) catalyst, or any combination thereof. The N 2 O formation amount of the emissions treatment system is less than 30 ppm. A method for heat generation. 97. The method for heat generation according to embodiment 96, wherein the hydrogen oxidation catalyst is selected from the group consisting of Pd / Al 2 O 3 , Pd / H-Y, Pd / H-ZSM-5, Pd / H-beta, Pd / MgO, Pd / SiO 2 / Al 2 O 3 , Pd / WO 3 / ZrO 2 , Pd / ZrO 2 , Pd / MgO-CeO 2 , Pd / (Al 2 O 3 +ZSM-5)+TiO 2 , Pd / SiO 2 , Pt / H-ZSM-5, and Pt / H-CHA. 98. The method for heat generation according to embodiment 96 or 97, wherein the emissions treatment system includes a hydrogen oxidation catalyst and a NO oxidation catalyst, and the hydrogen oxidation catalyst and the NO oxidation catalyst are combined. 99. The method for heat generation according to any one of embodiments 96 to 98, wherein the H 2 conversion rate of the hydrogen oxidation catalyst is in the range of 80 to 100%. 100. The method for heat generation according to any one of embodiments 96 to 99, wherein the inlet H 2 concentration to the emissions treatment system is in the range of 0.1 to 2%. 101. Use of a hydrogen oxidation catalyst for oxidizing hydrogen gas in an exhaust gas treatment system including a hydrogen injector positioned upstream of the hydrogen oxidation catalyst, wherein the NO formation amount of the exhaust gas treatment system is less than 30 ppm, and the hydrogen oxidation catalyst contains a platinum group metal supported on zeolite. 2 O formation amount is less than 30 ppm, and the hydrogen oxidation catalyst contains a platinum group metal supported on zeolite. 102. The hydrogen oxidation catalyst is selected from the group consisting of Pd / Al 2 O 3 , Pd / H-Y, Pd / H-ZSM-5, Pd / H-beta, Pd / MgO, Pd / SiO 2 / Al 2 O 3 , Pd / WO 3 / ZrO 2 , Pd / ZrO 2 , Pd / MgO-CeO 2 , Pd / (Al 2 O 3 +ZSM-5)+TiO 2 , Pd / SiO 2 , Pt / H-ZSM-5, and Pt / H-CHA. 103. The H conversion rate of the hydrogen oxidation catalyst is in the range of 80% to 100%. 2 Use of the hydrogen oxidation catalyst for oxidizing hydrogen gas according to Embodiment 101 or 102. 104. The exhaust gas treatment system includes a hydrogen oxidation catalyst and a NO oxidation catalyst, and the hydrogen oxidation catalyst and the NO oxidation catalyst are combined.

[0069] Unless otherwise indicated or unless apparent from the context, if one, more than one, or all of the members of a group are present in, used in, or otherwise related to a given product, process, or system, the conditions of a claim or specification that include "or" or "and / or" among at least one of the members of the group are considered satisfied. This disclosure includes embodiments where exactly one member of a group is present in, used in, or otherwise related to a given product, process, or system. This disclosure includes embodiments where more than one or all of the members of a group are present in, used in, or otherwise related to a given product, process, or system.

[0070] Furthermore, this disclosure encompasses all variations, combinations, and substitutions in which at least one limitation, element, clause, and descriptive term from at least one of the recited claims is introduced into another claim. For example, any claim that depends on another claim can be modified to include at least one limitation found in any other claim that depends on the same independent claim. When elements are presented as a list, such as in a Markush group format, each subgroup of the elements is also disclosed and any element can be removed from the group. Generally, when the disclosure or an aspect of the disclosure is referred to as including a particular element and / or feature, it should be understood that embodiments or aspects of the disclosure consist of or consist essentially of such element and / or feature. For the sake of brevity, these embodiments are not specifically described in these words herein. When ranges are given, the endpoints are included. Furthermore, unless otherwise indicated or unless not apparent from the context and the understanding of one of ordinary skill in the art, values expressed as ranges can assume any specific value or subrange within the recited range in different embodiments of the disclosure, unless the context clearly dictates otherwise.

[0071] One of ordinary skill in the art will recognize, or be able to ascertain using no more than routine experimentation, many equivalents to the specific embodiments of the disclosure described herein. Such equivalents are intended to be encompassed by the claims.

Claims

1. An exhaust gas treatment system for a combustion engine, comprising a hydrogen injector positioned upstream of a hydrogen oxidation catalyst and a NO oxidation catalyst, wherein the hydrogen oxidation catalyst and the NO oxidation catalyst are combined, and the hydrogen oxidation catalyst comprises a platinum group metal supported on zeolite. An exhaust gas treatment system for a combustion engine.

2. wherein the hydrogen oxidation catalyst is Pd / Al ２ O ３ , Pd / H-Y, Pd / H-ZSM-5, Pd / H-beta, Pd / MgO, Pd / SiO ２ / Al ２ O ３ , Pd / WO ３ / ZrO ２ , Pd / ZrO ２ , Pd / MgO-CeO ２ , Pd / (Al ２ O ３ +ZSM-5)+TiO ２ , Pd / SiO ２ , Pt / H-ZSM-5, and Pt / H-CH A, and the exhaust gas treatment system for a combustion engine according to claim 1, which is selected from the group consisting of.

3. The NOx formation amount of the exhaust gas treatment system is less than 30 ppm, and the exhaust gas treatment system for a combustion engine according to claim 1 or 2. ２ ​

4. A method for heat generation in an engine exhaust system, wherein the engine exhaust system comprises an exhaust gas treatment system, and the method comprises injecting hydrogen gas at a temperature in the range of about 100°C to about 250°C into an exhaust gas treatment system comprising a hydrogen injector positioned upstream of a hydrogen oxidation catalyst, enabling the hydrogen oxidation catalyst to oxidize the hydrogen gas, and raising the temperature of the engine exhaust system downstream of the hydrogen oxidation system. The hydrogen oxidation catalyst comprises a platinum group metal supported on zeolite. The hydrogen oxidation catalyst is positioned upstream of one or more of a NO oxidation catalyst, a selective catalytic reduction (SCR) catalyst, an ammonia oxidation (AMOX) catalyst, or any combination thereof. The N ２ O formation amount of the exhaust gas treatment system is less than 30 ppm, a method for heat generation.

5. The hydrogenation catalyst is Pd / Al ２ O ３ , Pd / H-Y, Pd / H-ZSM-5, Pd / H-beta, Pd / MgO, Pd / SiO ２ / Al ２ O ３ , Pd / WO ３ / ZrO ２ , Pd / ZrO ２ , Pd / MgO-CeO ２ , Pd / (Al ２ O ３ +ZSM-5)+TiO ２ , Pd / SiO ２ , Pt / H-ZSM-5, and Pt / H-CH A, and the method for exothermic reaction according to claim 4, which is selected from the group consisting of.

6. The method for heat generation according to claim 4 or 5, wherein the exhaust gas treatment system comprises the hydrogen oxidation catalyst and the NO oxidation catalyst, and the hydrogen oxidation catalyst and the NO oxidation catalyst are combined.

7. The H of the hydrogenation catalyst ２ The method for heat generation according to any one of claims 4 to 6, wherein the conversion rate is in the range of 80 to 100%.

8. Inlet H to the discharge treatment system ２ A method for heat generation according to any one of claims 4 to 7, wherein the concentration is 0.1 to 2%.

9. Use of the hydrogen oxidation catalyst for oxidizing hydrogen gas in an exhaust gas treatment system including a hydrogen injector positioned upstream of the hydrogen oxidation catalyst, wherein the N ２ O formation amount of the exhaust gas treatment system is less than 30 ppm, and the hydrogen oxidation catalyst includes a platinum group metal supported on zeolite, for use in oxidizing hydrogen gas.

10. The hydrogen oxidation catalyst is Pd / Al ２ O ３ , Pd / H-Y, Pd / H-ZSM-5, Pd / H-beta, Pd / MgO, Pd / SiO ２ / Al ２ O ３ , Pd / WO ３ / ZrO ２ , Pd / ZrO ２ , Pd / MgO-CeO ２ , Pd / (Al ２ O ３ +ZSM-5)+TiO ２ , Pd / SiO ２ , Pt / H-ZSM-5, and Pt / H-CH A, and the use of the hydrogen oxidation catalyst for oxidizing hydrogen gas according to claim 9.

11. The H of the hydrogen oxidation catalyst ２ Use of a hydrogen oxidation catalyst for oxidizing hydrogen gas according to claim 9 or 10, wherein the conversion rate of the hydrogen oxidation catalyst is in the range of 80 to 100%.

12. Use of a hydrogen oxidation catalyst for oxidizing hydrogen gas according to any one of claims 9 to 11, wherein the exhaust gas treatment system comprises the hydrogen oxidation catalyst and the NO oxidation catalyst, and the hydrogen oxidation catalyst and the NO oxidation catalyst are combined.

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