US2018065084A1PendingUtilityA1

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
F01N 3/28B01D 53/72B01D 53/94B01J 23/38B01J 23/58B01J 23/42B01J 23/44B01J 23/34B01D 53/92B01D 2255/2073F01N 3/035B01D 53/9468B01D 2255/20776B01D 2255/912B01J 29/743B01D 2255/9022F01N 2570/12F01N 2570/14B01D 2255/40B01D 2257/502B01D 2255/1023F01N 3/2882B01D 53/9445B01J 23/6562B01D 53/9459F01N 3/103F01N 2370/02B01J 29/40B01D 53/9427F01N 3/281F01N 3/106B01D 53/944B01D 2201/62B01D 53/945B01J 23/63F01N 2510/06B01D 2255/902B01D 2255/502B01D 2255/1021F01N 3/0835F01N 2570/10B01D 2257/404F01N 2510/0684B01D 53/9472B01J 29/7007F01N 2330/02B01J 23/66B01D 53/922B01D 2255/30F01N 3/0842B01J 37/0244B01D 2255/20707B01J 23/10B01J 23/656B01J 37/0036B01J 37/0234B01J 21/12B01D 2255/20715F01N 3/0857B01D 53/62B01J 23/40F01N 2510/0682B01D 2255/2042F01N 2330/06B01D 2255/9032B01D 2255/91B01J 37/0246B01J 37/10B01D 53/9418B01J 37/0219F01N 3/0814B01D 2255/504B01J 37/086B01D 2255/2065B01J 23/02B01D 53/9413F01N 3/0807B01D 2257/702B01D 53/9422B01D 2255/903B01J 29/7415B01J 29/7015B01D 53/9477B01D 2255/50B01J 21/10B01J 37/0228B01D 53/56F01N 3/2828F01N 3/10B01D 2255/2092B01J 37/0236B01D 53/9454B01J 35/04B01J 35/023B01J 35/0006B01J 35/56B01J 29/70B01J 37/02F01N 3/022Y02A50/20Y02C20/10Y02T10/12B01J 35/19
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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 exhaust system for a diesel engine, which comprises an oxidation catalyst for treating an exhaust gas from the diesel engine and an emissions control device, wherein the oxidation catalyst comprises:
 a first washcoat zone 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 zone for oxidising nitric oxide (NO), wherein the second washcoat zone 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, and   wherein the second washcoat zone is disposed at an outlet end of the substrate, and the first washcoat zone disposed at an inlet end of the substrate.   
     
     
         2 . An exhaust system according to  claim 1 , wherein the second washcoat zone comprises platinum (Pt) as the only platinum group metal. 
     
     
         3 . An exhaust system 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 exhaust system according to  claim 3 , wherein the second support material comprises alumina doped with silica. 
     
     
         5 . An exhaust system 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 exhaust system 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 exhaust system according to  claim 6 , wherein the first support material comprises alumina doped with silica. 
     
     
         8 . An exhaust system according to  claim 1 , wherein the first washcoat zone further comprises a hydrocarbon adsorbent material, which is a zeolite. 
     
     
         9 . An exhaust system according to  claim 8 , wherein the first washcoat zone comprises a total amount of hydrocarbon adsorbent, which is a zeolite, of 0.2 to 3.00 g in −3 . 
     
     
         10 . An exhaust system according to  claim 1 , wherein the first washcoat zone further comprises an alkaline earth metal. 
     
     
         11 . An exhaust system according to  claim 1 , wherein the first washcoat zone is substantially free of manganese or an oxide thereof. 
     
     
         12 . An exhaust system according to  claim 1 , wherein the second washcoat zone does not comprise at least one of rhodium, an alkali metal and an alkaline earth metal. 
     
     
         13 . An exhaust system according to  claim 1 , wherein the substrate is a flow-through substrate. 
     
     
         14 . An exhaust system according to  claim 1 , wherein the emissions control device is selected from the group consisting of a diesel particulate filter, a selective catalytic reduction catalyst, a catalysed soot filter, a selective catalytic reduction filter catalyst, and combinations of two or more thereof. 
     
     
         15 . A vehicle comprising a diesel engine and an exhaust system as defined in  claim 1 .

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