407results about "Surface coverings" patented technology

The present invention provides an exhaust gas purification catalyst in which platinum group metal migration from a catalyst layer to a base material during high temperature duration is suppressed. The exhaust gas purification catalyst disclosed herein includes a base material, a catalyst layer, and an intermediate layer arranged between the base material and the catalyst layer. The base material contains SiC. The catalyst layer contains a platinum group metal as a catalyst component. The intermediate layer contains substantially no platinum group metal. A product of a thickness of the intermediate layer (μm) and a specific surface area (m2 / g) of the intermediate layer is 1100 or more.

An exhaust aftertreatment system (10) in the exhaust stream of an internal combustion engine (12) that is at least partially powered by an alcohol fuel is permeable to an exhaust stream containing nitrogen oxides as well as an alcohol and / or formaldehyde. The exhaust aftertreatment system (10) comprises a metering device (14) for metering ammonia into the exhaust stream, a first SCR catalyst (16), and a second SCR catalyst (18), wherein the first SCR catalyst (16) is arranged in the exhaust stream downstream of the metering device (14) and is configured to generate a treated exhaust stream from the exhaust stream of the internal combustion engine (12) that contains nitrogen oxides and at least one nitrogen-containing hydrocarbon compound.The second SCR catalyst (18) is arranged in the exhaust stream downstream of the first SCR catalyst (16) and is designed to reduce the nitrogen oxides contained in the generated treated exhaust stream by consuming the nitrogen-containing hydrocarbon compound contained in the generated treated exhaust stream. Furthermore, a method for exhaust aftertreatment and the use of an exhaust aftertreatment system (10) are specified.

An exhaust aftertreatment system (10) in the exhaust stream of an internal combustion engine (12) that is at least partially powered by an alcohol fuel is permeable to an exhaust stream from the internal combustion engine (12) containing nitrogen oxides as well as an alcohol and / or formaldehyde. The exhaust aftertreatment system (10) comprises an oxidation catalyst (14) for removing methanol and formaldehyde from the exhaust stream, an SCR catalyst (18), and a metering device (16) for metering ammonia into the exhaust stream, wherein the oxidation catalyst (14) is arranged in the exhaust stream upstream of the SCR catalyst (18). The metering device (16) is arranged in the exhaust stream upstream of the SCR catalyst (18) and upstream or downstream of the oxidation catalyst (14). Furthermore, a method for exhaust aftertreatment and the use of the exhaust aftertreatment system (10) are specified.

An exhaust gas purification catalyst disclosed herein comprises a catalyst layer 20 including a lower catalyst layer 22 and an upper catalyst layer 24. A lower-layer front portion A containing Pd is provided on the upstream side of the lower catalyst layer 22, and a lower-layer rear portion B containing at least one of Pd and Pt is provided on the downstream side of the lower catalyst layer 22. Further, an upper-layer front portion C containing Rh is provided on the upstream side of the upper catalyst layer 24, and an upper-layer rear portion D containing Rh is provided on the downstream side of the upper catalyst layer 24. The lower-layer front portion A, the lower-layer rear portion B, the upper-layer front portion C, and the upper-layer rear portion D each have an individually set CeO2 content. In addition, in this exhaust gas purification catalyst, the ratio APGM / BPGM of the amount of the catalytic metal present in the lower-layer front portion A to the amount of the catalytic metal present in the lower-layer rear portion B is set to 0.8 or more and 1.1 or less from the viewpoint of achieving both OSC performance and warm-up performance. As a result, it is possible to provide an exhaust gas purification catalyst that can exhibit adequate purification performance according to the operation state of an internal combustion engine.

The invention provides a catalyst composition, including a mixture of catalytically active particles and a magnetic material, such as superparamagnetic iron oxide nanoparticles, capable of inductive heating in response to an applied alternating electromagnetic field. The catalytically active particles will typically include a base metal, platinum group metal, oxide of base metal or platinum group metal, or combination thereof, and will be adapted for use in various catalytic systems, such as diesel oxidation catalysts, catalyzed soot filters, lean NOx traps, selective catalytic reduction catalysts, ammonia oxidation catalysts, or three-way catalysts. The invention also includes a system and method for heating a catalyst material, which includes a catalyst article that includes the catalyst composition and a conductor for receiving current and generating an alternating electromagnetic field in response thereto, the conductor positioned such that the generated alternating electromagnetic field is applied to at least a portion of the magnetic material.

A catalyst article for treating exhaust gas, comprising a substrate having an axial length L and including an inlet end and an outlet end, a first catalyst region starting at the inlet end and extending over a length less than the axial length L, the first catalyst region comprising a first platinum group metal (PGM) component, a first inorganic oxide, and an optional first oxygen storage capacity (OSC) material, a second catalyst region starting at the outlet end and extending over a length less than the axial length L, the second catalyst region comprising a second PGM component, an optional second inorganic oxide, and a second OSC material, and a third catalyst region, wherein the weight ratio of the optional first OSC material to the first inorganic oxide is greater than 1:1.

The present disclosure relates to zeolite catalysts having an aging durability and improved catalytic activity. For example, the zeolite catalysts comprise a specific aluminum distribution, e.g., the positioning of two framework aluminum atoms in the zeolite structure at third-nearest-neighbor (3NN) relative positions in the framework. The zeolite catalysts have two tetrahedrally coordinated AI sites that are separated by two tetrahedrally coordinated Si sites. The disclosure is also directed to process and methods for their characterization and usage.

An oxidation catalyst article comprises a flow-through honeycomb substrate having an inlet end and an outlet end and a longitudinal length extending therebetween and comprising an array of channels each defined by a channel wall, a first washcoat extending from the inlet end up to 40% of the longitudinal length of the substrate and comprising a first platinum group metal composition on a first alumina support, the first washcoat having a total combined loading of Pt and Pd of X g / L (gft-3), a second washcoat extending from the inlet end up to 85% of the longitudinal length of the substrate and entirely overlapping the first washcoat, the second washcoat comprising a second platinum group metal composition on a second alumina support, the second washcoat having a total combined loading of Pt and Pd of Y g / L (gft-3); and a third washcoat extending from the outlet end comprising a third platinum group metal composition wherein the third platinum group metal composition is platinum only or both platinum and palladium on a third alumina support, the third washcoat having a total platinum group metal loading of Z g / L (gft-3); wherein 2Z<X>1.5Y, and wherein the third washcoat does not overlap the first washcoat.

Exhaust gas purification device (100), comprising: a substrate (10) comprising an upstream end (I) through which an exhaust gas is introduced into the device and a downstream end (J) through which the exhaust gas is discharged from the device, wherein the substrate (10) has a length Ls between the upstream end (I) and the downstream end (J); a first catalyst layer (20) containing palladium particles, which extends over a first region (X) and is in contact with the substrate (10), wherein the first region (X) extends between the upstream end (I) and a first position (P), wherein the first position (P) is located at a first distance La from the upstream end (I) in the direction of the downstream end (J); a second catalyst layer (30) containing rhodium particles, which extends over a second region (Y) and is in contact with the substrate (10), wherein the second region (Y) extends between the downstream end (J) and a second position (Q), the second position (Q) being located at a second distance Lb from the downstream end (J) in the direction of the upstream end (I); and a third catalyst layer (40) containing rhodium particles, which extends over a third region (Z) and is in contact with at least the first catalyst layer (20), wherein the third region (Z) extends between the upstream end (I) and a third position (R), wherein the third position (R) is located at a third distance Lc from the upstream end (I) in the direction of the downstream end (J), wherein a mean particle size distribution of the rhodium particles contained in the second catalyst layer (30) and the third catalyst layer (40) is from 1.0 nm to 2.0 nm, and a standard deviation of the particle size distribution of the rhodium particles contained in the second catalyst layer (30) and the third catalyst layer (40) is 0.8 nm or less.

Provided are particles for an exhaust gas purification catalyst, the particles comprising: inorganic oxide particles; and an inorganic coating layer covering the inorganic oxide particles. The particles for an exhaust gas purification catalyst have reduced cumulative pore volume in a pore diameter range of 0.1-20 µm compared to a cumulative pore volume in a pore diameter range of 0.1-20 µm of inorganic oxide particles before being coated with the inorganic coating layer. Accordingly, the particles for an exhaust gas purification catalyst have a higher thermal conductivity than the inorganic oxide particles before being coated with the inorganic coating layer.

The present disclosure relates to a coated filter for filtering particulate matter from exhaust gases. The filter has a porous catalytic composition coating, the catalytic composition including zeolite, copper, and manganese. The present disclosure also relates to a method of forming the coated filter described herein, and an exhaust system including the coated filter described herein.

Provided is a catalyst for exhaust gas purification that has improved NOx storage performance in a lean atmosphere. A catalyst 100 for exhaust gas purification disclosed herein includes a substrate 10 and a catalyst layer 20. The catalyst layer 20 includes a lower layer 22, a middle layer 24, and an upper layer 26. The upper layer 26 contains Rh. The middle layer 24 contains at least Pt and a NOx storage material. The lower layer 22 has a lower-layer front portion 22a containing Pd and a lower-layer rear portion 22b containing Pd. The Pd content (CF) in the lower-layer front portion 22a per L of the substrate is greater than the Pd content (CR) in the lower-layer rear portion 22b per L of the substrate.

A technology capable of achieving excellent NOx storage ability is provided. An exhaust gas-purifying catalyst 1 according to the present invention includes a substrate 10 and a catalyst layer 20 supported on the substrate 10, wherein the catalyst layer 20 contains a first supported catalyst 21 containing a first heat resistant carrier 210 and rhodium 211 supported on the first heat resistant carrier 210, a second supported catalyst 22 containing a second heat resistant carrier 220 and platinum 221 supported on the second heat resistant carrier 220, the second heat resistant carrier 220 containing an inorganic oxide which has a spinel structure and contains alumina and magnesia, a third supported catalyst 25 containing a third heat resistant carrier 250 and platinum 251a and a noble metal 251b other than platinum which are supported on the third heat resistant carrier, and a nitrogen oxide storage material 24 and 26, wherein a proportion of a mass of platinum contained in the second supported catalyst 22 in an entire mass of platinum contained in the catalyst layer is in a range of 15% by mass to 35% by mass.

A NOX storage catalyst includes CHA zeolite, a transition metal ion-exchanged in the CHA zeolite, and a rare earth metal that is different the transition metal and is supported on the CHA zeolite. A method for preparing a NOX storage catalyst includes preparing a synthetic mother liquid including a zeolite raw material as a source of silica and alumina, a structure-inducing material, a complexing material, and a solvent, reacting the synthetic mother liquid to prepare a CHA zeolite, and supporting a transition metal and a rare earth metal that is different from the transition metal on the prepared CHA zeolite.

An object of the present invention is to provide an exhaust gas purification catalyst including a catalyst layer containing Rh and a Ce-Zr-Al-based complex oxide, the exhaust gas purification catalyst being capable of achieving both improvement of the oxygen storage capacity of the Ce-Zr-Al-based complex oxide and prevention of the decrease in the exhaust gas purification performance of Rh, and the present invention provides an exhaust gas purification catalyst (1) including a substrate (10) and a first catalyst layer (20) provided on the substrate (10), wherein the first catalyst layer (20) contains Rh and a complex oxide containing Ce, Zr, and Al, wherein the content of the complex oxide is 70% by mass or more, based on a total mass of all components other than Rh in the first catalyst layer (20), and wherein a mass ratio of a content of Ce in terms of metal in the complex oxide to a content of Zr in terms of metal in the complex oxide is 0.03 or more and 0.50 or less.

A sensor element includes: an element body including an oxygen-ion-conductive solid electrolyte layer; and a protective layer that covers at least part of the element body and is a porous body having a plurality of pores thereinside. The standard deviation of the porosity of the protective layer is 2.3% or less.

The present invention relates to a particulate filter, which comprises a substrate comprising a plurality of porous walls extending longitudinally to form a plurality of parallel channels extending from an inlet end to an outlet end, wherein a quantity of the channels are inlet channels that are open at the inlet end and closed at the outlet end, and a quantity of channels are outlet channels that are closed at the inlet end and open at the outlet end; and a layer of inorganic particles loaded on surfaces of porous walls in the inlet channels and / or outlet channels, wherein the inorganic particles comprise or consist of boehmite particles. The present invention also relates to a method for producing a particulate filter which includes applying inorganic particles comprising or consisting of boehmite particles in inlet channels and / or outlet channels of a substrate.

A honeycomb filter includes: a honeycomb substrate having porous partition walls disposed so as to surround cells extending from an inflow end face to an outflow end face, an outer peripheral coating layer disposed so as to surround an outer periphery of the honeycomb substrate, and plugging portions that are disposed at any one of ends on the inflow end face and ends on the outflow end face, of the cells, wherein, the outer peripheral coating layer has an inflection point at which thermal expansion in thermal expansion behavior of the outer peripheral coating layer turns to contraction and a temperature T1 of which is 1000 to 1500° C., and the outer peripheral coating layer has a porosity P1 of 36 to 48%, and a thermal expansion coefficient C1 between 40 to 800° C. of 2.5 to 3.5×10−6 / ° C.

The present disclosure relates to catalyst compositions, catalytic articles for purifying exhaust gas emissions, and methods of making and using the catalyst compositions and catalytic articles. In particular, the disclosure relates to catalysts having a catalytic material on a substrate, the catalytic material having a first layer and a second layer, where the first layer provides an effective lean NOx trap function and the second layer provides effective three-way conversion of carbon monoxide, hydrocarbons, and nitrogen oxides (NOx).

An object of the present invention is to provide a new technique to impart NOx adsorption performance to a catalyst layer containing Pt, thereby improving the exhaust gas purification performance, while suppressing decrease in the dispersibility of Pt, and the present invention provides an exhaust gas purification catalyst composition containing Pt and Mg, wherein a content of Mg in terms of metal is 2.0% by mass or more and 9.0% by mass or less based on a mass of the exhaust gas purification catalyst composition.

A washcoat slurry comprising a platinum group metal (PGM), an oxygen storage capacity (OSC) material, an inorganic oxide support, a polyacrylate, and a solventis disclosed. A method for the manufacture of a catalytic gasoline particulate filter for the treatment of an exhaust gas comprising coating a wall-flow filter substrate with the washcoat slurry is disclosed.

A catalyst for the treatment of an exhaust gas stream containing one or more of formaldehyde, nitrogen oxide (NO), and hydrocarbons, the catalyst comprising a first washcoat layer comprising Mn supported on a CuO—Al2O3 mixed oxide, and a substrate, wherein the substrate has an inlet end, and an outlet end, wherein the catalyst further 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. Further, the present invention relates to an exhaust gas treatment system comprising said catalyst, a method for the treatment of an exhaust gas stream containing one or more of formaldehyde, nitrogen oxide (NO), and hydrocarbons using said catalyst.

The present invention relates to a catalyst article for treating exhaust gas, the catalyst article comprising a substrate and at least a first catalytic region disposed on the substrate, wherein the first catalytic region comprises a ceria-zirconia support material and a non-ceria-zirconia support material; wherein from 0.1 to 3 wt. % Pt is supported on the ceria-zirconia support material, based on the total weight of the Pt supported on the ceria-zirconia support material and the ceria-zirconia support material; wherein less than 0.1 wt. % Pt is supported on the non-ceria-zirconia support material, based on the total weight of the Pt supported on the non-ceria-zirconia support material and the non-ceria-zirconia support material; and wherein the first catalytic region comprises from 0.1 to 50 g / ft3 Pt, based on the total volume of the substrate.

Embodiments of the disclosure provide an apparatus having a source gas conduit with a sorbent coating to adsorb compounds from a gas stream, and related methods. An apparatus of the disclosure includes a heat exchanger having an interior configured to transmit a heat exchange medium. A plurality of source gas conduits is in thermal communication with the heat exchanger and configured to transmit a gas stream therethrough. Each of the plurality of source gas conduits is in thermal communication with the heat exchanger. A sorbent coating is on an interior sidewall of each of the plurality of source gas conduits.

To provide a hydrocarbon trap capable of improving adsorption rate in a predetermined temperature region of hydrocarbon contained in exhaust air.SOLUTION: A hydrocarbon trap 12 is used for adsorbing hydrocarbons contained in the exhaust of a direct-injection gasoline engine 1. The hydrocarbon trap 12 has a hydrocarbon adsorbent supported on the surface of the pores of a porous substrate. The hydrocarbon adsorbent includes a first zeolite, capable of adsorbing olefins contained in the exhaust, and a second zeolite, capable of adsorbing paraffins and aromatic compounds contained in the exhaust. The first zeolite adsorbs olefins in a first temperature range and desorbs olefins in a second temperature range, which is higher than the first temperature range. The second zeolite desorbs paraffins and aromatic compounds in the first temperature range and adsorbs paraffins and aromatic compounds in the second temperature range.SELECTED DRAWING: Figure 1

Disclosed is a catalyst composition for selective catalytic reduction of nitrogen oxides, consisting of at least one vanadium oxide in an amount of 2.0 to 4.0 wt.-%, calculated as V2O5 and based on the total weight of the catalyst composition; at least one tungsten oxide in an amount of 2.5 to 7.2 wt.-%, calculated as WO3 and based on the total weight of the catalyst composition; at least one antimony oxide in an amount of 0.6 to 3.4 wt.-%, calculated as Sb2O5 and based on the total weight of the catalyst composition; at least one zirconium oxide in an amount of 0 to 1.0 wt.-%, calculated as ZrO2 and based on the total weight of the catalyst; and at least one titanium oxide in an amount of 84.6 to 94.9 wt.-%, calculated as TiO2 and based on the total weight of the catalyst, wherein the weight ratio of the oxides of vanadium, tungsten, antimony, titanium and optionally zirconium, calculated as V2O5, WO3, Sb2O5, TiO2 and optionally ZrO2, respectively, add up to 100 wt.-%. Furthermore, disclosed is an SCR catalytic article, wherein the SCR catalyst composition according to the invention is attached in the form of a coating. Suitable catalyst carriers are corrugated substrates and cordierite monoliths. The SCR catalytic articles can be used in a method for reducing nitrogen oxides in the exhaust gas of lean-burn internal combustion engines, and they can also be included in exhaust gas purification systems for treating diesel engine exhaust gas.

A method for the manufacture of a gasoline particulate filter (GPF) for the treatment of an exhaust gas is disclosed. The method comprises (i) forming a washcoat slurry; (ii) coating a wall-flow filter substrate with the washcoat slurry to form a washcoated substrate; and (iii) calcining the washcoated substrate to form a gasoline particulate filter. The washcoat slurry comprises (a) a platinum group metal selected from the group consisting of Pt, Pd, Rh and mixtures thereof; (b) an oxygen storage capacity (OSC) material; and (c) a C2-C6 aliphatic amino acid.

A washcoat slurry comprising a platinum group metal (PGM), an oxygen storage capacity (OSC) material, an inorganic oxide support, a polyacrylate, and a solvent is disclosed. A method for the manufacture of a catalytic gasoline particulate filter for the treatment of an exhaust gas comprising coating a wall-flow filter substrate with the washcoat slurry is disclosed.

The present invention provides a catalytic article comprising a substrate, a bottom washcoat deposited on the substrate, and a top washcoat deposited on the bottom washcoat, the bottom washcoat comprising a zoned configuration, the zoned configuration comprising a first zone and a second zone, the first zone comprising palladium supported on a ceria-zirconia mixed oxide or alumina or both, the second zone comprising platinum supported on a ceria-alumina composite, and the top washcoat comprising rhodium supported on alumina or a ceria-alumina composite. The present invention also provides a process for preparing the catalytic article, and its use for purifying a gaseous exhaust stream.

An exhaust gas purification catalyst particle is an exhaust gas purification catalyst particle comprising inorganic oxide particles and an inorganic coating layer coating the inorganic oxide particles, wherein the cumulative fine pore volume in the range of 0.1 to 20 μm in pore diameter is reduced as compared to the cumulative fine pore volume in the range of 0.1 to 20 μm in pore diameter of the inorganic oxide particles before being coated with the inorganic coating layer, and the thermal conductivity is higher than that of the inorganic oxide particles before being coated with the inorganic coating layer.