US2017216770A1PendingUtilityA1

Diesel oxidation catalyst and exhaust system

68
Assignee: JOHNSON MATTHEY PLCPriority: Jan 23, 2014Filed: Apr 20, 2017Published: Aug 3, 2017
Est. expiryJan 23, 2034(~7.5 yrs left)· nominal 20-yr term from priority
Inventors:Andrew Francis ChiffeyJohn Benjamin GoodwinJames LeelandFrancois MoreauStuart David ReidDaniel Swallow
B01J 23/58B01J 23/38B01D 53/94B01J 23/42B01D 53/92B01J 23/34B01D 53/72B01J 23/44F01N 3/28B01D 2257/702B01D 53/9468B01D 2255/2092F01N 3/0814B01D 53/62B01J 37/086B01J 23/40F01N 3/0857B01D 53/9413B01D 2255/903B01D 53/922F01N 3/0842B01D 53/944B01D 2257/404B01D 2255/912F01N 3/0807F01N 3/035B01J 23/656F01N 3/2882B01D 53/945F01N 3/281B01D 2201/62B01J 23/66B01D 2255/20715F01N 3/106B01J 37/0234B01J 37/0244F01N 2510/0684B01J 23/10B01J 37/0246B01D 2255/9022B01D 2255/40B01D 2255/91B01D 2257/502B01D 53/9459B01D 2255/1021B01J 23/6562B01D 53/9445B01J 29/40B01J 23/63B01D 2255/20776B01D 2255/902F01N 2510/06B01D 2255/1023B01D 53/9427F01N 3/103B01D 2255/502B01J 29/7007B01D 2255/20707B01D 53/9472F01N 2570/14B01J 37/0036B01D 2255/504B01D 2255/2073F01N 2330/06B01D 2255/30B01J 37/0228B01D 53/9454F01N 2570/12B01J 23/02B01D 53/56B01J 37/0236B01D 2255/9032F01N 3/10F01N 2330/02B01D 2255/2065B01D 53/9422B01J 29/7415B01J 21/10F01N 2510/0682B01D 2255/50B01J 37/0219F01N 2570/10B01J 37/10F01N 3/2828B01J 29/7015B01D 2255/2042B01J 21/12B01J 29/743B01D 53/9477F01N 2370/02B01D 53/9418F01N 3/0835B01J 35/04B01J 35/0006B01J 35/56B01J 29/70B01J 37/02F01N 3/022Y02A50/20Y02C20/10Y02T10/12B01J 35/19
68
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Claims

Abstract

An oxidation catalyst for treating an exhaust gas from a diesel engine, which oxidation catalyst comprises: a first washcoat region comprising a first platinum group metal (PGM), a first support material and a NO x storage component; a second washcoat region comprising platinum (Pt), manganese (Mn) and a second support material; and a substrate having an inlet end and an outlet end.

Claims

exact text as granted — not AI-modified
1 - 20 . (canceled) 
     
     
         21 . An oxidation catalyst for treating an exhaust gas from a diesel engine, which oxidation catalyst comprises:
 a first washcoat region comprising a first platinum group metal (PGM), a first support material and a NOx storage component;   a second washcoat region comprising platinum (Pt), manganese (Mn) and a second support material; and   a third washcoat region disposed directly on to the substrate   a substrate having an inlet end and an outlet end.   
     
     
         22 . An oxidation catalyst according to  claim 21 , wherein the manganese (Mn) is disposed or supported on the second support material. 
     
     
         23 . An oxidation catalyst according to  claim 21 , wherein the second washcoat region has a ratio by total weight of manganese (Mn) to platinum of 5:1 to 0.2:1. 
     
     
         24 . An oxidation catalyst according to  claim 21 , wherein the second washcoat region comprises palladium. 
     
     
         25 . An oxidation catalyst according to  claim 21 , wherein the second washcoat region has a ratio of platinum to palladium by total weight of 1:0 to 2:1. 
     
     
         26 . An oxidation catalyst according to  claim 21 , 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 thereof, wherein the refractory metal oxide is optionally doped with a dopant. 
     
     
         27 . An oxidation catalyst according to  claim 26 , wherein the refractory metal oxide is alumina doped with silica. 
     
     
         28 . An oxidation catalyst according to  claim 21 , wherein the NOx storage component comprises an alkali metal, alkaline earth metal and/or a rare earth metal, wherein the rare earth metal is selected from the group consisting of lanthanum, yttrium and a combination thereof. 
     
     
         29 . An oxidation catalyst according to  claim 21 , wherein the first PGM is disposed or supported on the first support material. 
     
     
         30 . An oxidation catalyst according to  claim 21 , wherein the first PGM is selected from platinum, palladium, a combination of platinum and palladium, a combination of platinum and rhodium, a combination of palladium and rhodium, and a combination of platinum, palladium and rhodium. 
     
     
         31 . An oxidation catalyst according to  claim 21 , wherein the first support material comprises a refractory metal oxide comprising an alkaline earth metal aluminate. 
     
     
         32 . An oxidation catalyst according to  claim 21 , 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 thereof, optionally doped with a dopant. 
     
     
         33 . An oxidation catalyst according to  claim 32 , wherein the refractory metal oxide is alumina doped with magnesium oxide. 
     
     
         34 . An oxidation catalyst according to  claim 21 , wherein the first PGM is a combination of platinum and palladium, and the platinum is disposed or supported on the first support material and/or the palladium is disposed or supported on the first support material. 
     
     
         35 . An oxidation catalyst according to  claim 21 , wherein the first PGM is a combination of platinum and palladium, a combination of palladium and rhodium or a combination of platinum, palladium and rhodium, and wherein the first washcoat region further comprises a palladium support material. 
     
     
         36 . An oxidation catalyst according to  claim 35 , wherein the platinum and/or the rhodium is disposed or supported on the first support material and the palladium is disposed or supported on the palladium support material. 
     
     
         37 . An oxidation catalyst according to  claim 35 , wherein the NOx storage component is disposed or supported on the palladium support material. 
     
     
         38 . An oxidation catalyst according to  claim 35 , wherein the palladium support material comprises a refractory metal oxide comprising ceria or a mixed or composite oxide of ceria. 
     
     
         39 . An oxidation catalyst according to  claim 21 , wherein the substrate is a through-flow substrate. 
     
     
         40 . An exhaust system comprising an oxidation catalyst as defined in  claim 21  and an emissions control device.

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