Abstract:
Die vorliegende Erfindung betrifft einen Katalysator, der ein Trägersubstrat der Länge (L), die sich zwischen zwei Trägersubstratenden (a und b) erstreckt und zwei Beschichtungszonen (A und B) umfasst, wobei Beschichtungszone (A) einen Zeolithen und Palladium umfasst und sich ausgehend von Trägersubstratende (a) auf einem Teil der Länge (L) erstreckt, Beschichtungszone (B) die gleichen Komponenten wie Beschichtungszone (A) und Platin umfasst und sich ausgehend von Trägersubstratende (b) auf einem Teil der Länge (L) erstreckt, wobei L = L A + L B gilt, worin L A die Länge der Beschichtungszone (A) und L B die Länge der Beschichtungszone (B) bezeichnet, sowie ein diesen enthaltendes Abgassystem.
Abstract:
An oxidation catalyst is described for treating an exhaust gas produced by a diesel engine comprising a catalytic region and a substrate, wherein the catalytic region comprises a catalytic material comprising: bismuth (Bi) or an oxide thereof; a platinum group metal (PGM) selected from the group consisting of (i) platinum (Pt), (ii) palladium (Pd) and (iii) platinum (Pt) and palladium (Pd); and a support material comprising a mixed oxide of titanium dioxide and silica; or a composite oxide of titanium dioxide and silica; or titanium dioxide doped with silica; wherein the platinum group metal (PGM) is supported on the support material; and wherein the bismuth (Bi) or an oxide thereof is supported on the support material.
Abstract:
An oxidation catalyst is described for treating hydrocarbons in an exhaust gas produced by an internal combustion engine, wherein the oxidation catalyst comprises a region disposed on a substrate, wherein the region comprises ruthenium (Ru) supported on a support material comprising a refractory oxide.
Abstract:
A NO x absorber catalyst for treating an exhaust gas from a diesel engine. The NO x absorber catalyst comprises a first NO x absorber materialcomprising a molecularsieve catalyst, wherein the molecular sieve catalyst comprises a noble metal and a molecular sieve, and wherein the molecular sieve contains the noble metal; a second NO x absorber material comprising palladium (Pd) supported on an oxide of cerium; and a substrate having an inlet end and an outlet end.
Abstract:
A catalytic article for treating an exhaust gas stream containing one or more of NOx, hydrocarbons, CO, SOx and ammonia from a combustion turbine comprises (a) a substrate having an inlet end and an outlet end defining an axial length; (b) an oxidation layer comprising an oxidation catalyst comprising one or more noble metals, the oxidation layer being positioned on the substrate and covering the axial length of the substrate; and (c) an SCR layer comprising an SCR catalyst, the SCR layer being positioned on the oxidation layer and overlapping a portion of the oxidation layer, wherein the portion is less than 100%.
Abstract:
Described are catalysts effective to abate NO x , hydrocarbons, and carbon monoxide from a gasoline engine exhaust gas. Such catalysts include a substrate having a first and second material disposed thereon, the first material effective to catalyze selective catalytic reduction of nitrogen oxides in the presence of ammonia and the second material effective to abate hydrocarbons and carbon monoxide, the first material comprising a molecular sieve promoted with copper and/or iron in a low loading, the second material comprising at least one oxide of Ni, Fe, Mn, Co, and Cu on a support selected from oxides of Ce, Ce-Zr, Zr, Mn, Pr and combinations thereof. Also described are gasoline engine exhaust gas treatment systems and methods of treating exhaust gas from a gasoline engine.
Abstract:
Provided is a diesel particulate filter capable of removing soot from an exhaust gas while operating at low backpressure, the filter comprising (a) a wall-flow filter substrate (23) having a mean pore size, an inlet side (30), an outlet side (32), and a porous interior (23) between the inlet and outlet sides; and (b) a catalyst composition (44) coated from the inlet side of the substrate, wherein the catalyst composition has a d5Q particle size distribution, wherein the dso particle size distribution is less than the mean pore size divided by 4.9, and wherein the outlet side is substantially free of a catalyst coating.
Abstract:
An oxidation catalyst for treating an exhaust gas from a compression ignition engine, which oxidation catalyst comprises: a substrate;a first washcoat region comprising palladium (Pd) and a first support material comprising cerium oxide; and a second washcoat region comprising platinum (Pt) and a second support material.
Abstract:
A substrate monolith (6) having a length L and comprising a first zone (11) of substantially uniform length defined at one end by a first end of the substrate monolith, which first zone comprising a selective catalytic reduction (SCR) catalyst for reducing oxides of nitrogen with a nitrogenous reductant in exhaust gas emitted from an internal combustion engine and a second zone (8) of substantially uniform length less than L defined at one end by a second end of the substrate monolith, which second zone comprising (a) at least one particulate metal oxide or a mixture of any two or more thereof for trapping gas phase platinum group metal (PGM), which at least one particulate metal oxide does not act as a support for any other catalytic component; or (b) a component capable of trapping and/or alloying with gas phase PGM.
Abstract:
An exhaust gas treatment process, apparatus, and system for reducing the concentration of NOx, CO and hydrocarbons in a gas stream, such as an exhaust stream (29), via selective catalytic reduction with ammonia is provided. The process, apparatus and system include a catalytic bed (32) having a reducing only catalyst portion (34) and a downstream reducing-plus-oxidizing portion (36). Each portion (34, 36) includes an amount of tungsten. The reducing-plus-oxidizing catalyst portion (36) advantageously includes a greater amount of tungsten than the reducing catalyst portion (36) to markedly limit ammonia salt formation.