US2018065085A1PendingUtilityA1

Diesel oxidation catalyst and exhaust system

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Assignee: JOHNSON MATTHEY PLCPriority: Jan 23, 2014Filed: Nov 8, 2017Published: Mar 8, 2018
Est. expiryJan 23, 2034(~7.5 yrs left)· nominal 20-yr term from priority
Inventors:Andrew Francis ChiffeyJohn Benjamin GoodwinJames LeelandFrancois Moreau
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Claims

Abstract

An oxidation catalyst for treating an exhaust gas from a diesel engine and an exhaust system comprising the oxidation catalyst are described. The oxidation catalyst comprises: a first washcoat region for oxidising carbon monoxide (CO) and hydrocarbons (HCs), wherein the first washcoat region comprises a first platinum group metal (PGM) and a first support material; a second washcoat region for oxidising nitric oxide (NO), wherein the second washcoat region comprises platinum (Pt), manganese (Mn) 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.

Claims

exact text as granted — not AI-modified
1 . An oxidation catalyst for treating an exhaust gas from a diesel engine, which comprises:
 a first washcoat layer for oxidising carbon monoxide (CO) and hydrocarbons (HCs), wherein the first washcoat layer comprises a first platinum group metal (PGM) and a first support material;   a second washcoat layer for oxidising nitric oxide (NO), wherein the second washcoat layer comprises platinum (Pt) and manganese (Mn) disposed or supported on a second support material, wherein the second support material comprises a refractory metal oxide; and   a substrate having an inlet end and an outlet end, and   wherein the second washcoat layer is disposed on the first washcoat layer.   
     
     
         2 . An oxidation catalyst according to  claim 1 , wherein the second washcoat layer comprises platinum (Pt) as the only platinum group metal. 
     
     
         3 . An oxidation catalyst according to  claim 1 , wherein the second support material comprises a refractory metal oxide selected from the group consisting of alumina, silica, titania, zirconia, ceria and a mixed or composite oxide of two or more thereof. 
     
     
         4 . An oxidation catalyst according to  claim 3 , wherein the second support material comprises alumina doped with silica. 
     
     
         5 . An oxidation catalyst according to  claim 1 , wherein the first platinum group metal (PGM) is selected from the group consisting of platinum (Pt), palladium (Pd) and a combination thereof. 
     
     
         6 . An oxidation catalyst according to  claim 1 , wherein the first support material comprises a refractory metal oxide selected from the group consisting of alumina, silica, titania, zirconia, ceria and a mixed or composite oxide of two or more thereof. 
     
     
         7 . An oxidation catalyst according to  claim 6 , wherein the first support material comprises alumina doped with silica. 
     
     
         8 . An oxidation catalyst according to  claim 1 , wherein the first washcoat layer further comprises a hydrocarbon adsorbent material, which is a zeolite. 
     
     
         9 . An oxidation catalyst according to  claim 8 , wherein the first washcoat layer comprises a total amount of hydrocarbon adsorbent, which is a zeolite, of 0.2 to 3.00 g in −3 . 
     
     
         10 . An oxidation catalyst according to  claim 1 , wherein the first washcoat layer further comprises an alkaline earth metal. 
     
     
         11 . An oxidation catalyst according to  claim 1 , wherein the first washcoat layer is substantially free of manganese or an oxide thereof. 
     
     
         12 . An oxidation catalyst according to  claim 1 , wherein the second washcoat layer does not comprise at least one of rhodium, an alkali metal and an alkaline earth metal. 
     
     
         13 . An oxidation catalyst according to  claim 1 , wherein the substrate is a flow-through substrate. 
     
     
         14 . An exhaust system for a diesel engine comprising an oxidation catalyst according to  claim 1  and an emissions control device. 
     
     
         15 . A vehicle comprising a diesel engine and an exhaust system as defined in  claim 14 .

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