| 发明名称 |
Positive Ignition Engine and Exhaust System Comprising Three-Way Catalysed Filter |
| 摘要 |
A positive ignition engine is disclosed. The engine comprises an exhaust system comprising a filter for filtering particulate matter from the emitted exhaust gas. The filter comprises a porous substrate having inlet surfaces and outlet surfaces. The porous substrate is coated at least in part with a three-way catalyst washcoat comprising a platinum group metal and a plurality of solid particles. The plurality of solid particles comprises at least one base metal oxide and at least one oxygen storage component which is a mixed oxide or composite oxide comprising cerium. The mixed oxide or composite oxide comprising cerium and/or the at least one base metal oxide has a median particle size (D50) less than 1 μm. The platinum group metal platinum and rhodium; palladium and rhodium; platinum, palladium and rhodium; palladium only; or rhodium only. A process for treating exhaust gas using the filter is also disclosed. |
| 申请公布号 |
US2014234189(A1) |
申请公布日期 |
2014.08.21 |
| 申请号 |
US201414181852 |
申请日期 |
2014.02.17 |
| 申请人 |
JOHNSON MATTHEY PUBLIC LIMITED COMPANY |
发明人 |
CLOWES Lucy;DESTECROIX Oliver;GOODWIN John Benjamin;GREENWELL David;HOWARD Michael Anthony;SCOTNEY Christopher Charles John |
| 分类号 |
B01D53/94;F01N3/035 |
主分类号 |
B01D53/94 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. A positive ignition engine comprising an exhaust system for a vehicular positive ignition internal combustion engine, which exhaust system comprising a filter for filtering particulate matter from exhaust gas emitted from the vehicular positive ignition internal combustion engine, which filter comprising a porous substrate having inlet surfaces and outlet surfaces, wherein the porous substrate is coated at least in part with a three-way catalyst washcoat comprising a platinum group metal and a plurality of solid particles, wherein the plurality of solid particles comprises at least one base metal oxide and at least one oxygen storage component which is a mixed oxide or composite oxide comprising cerium, wherein the mixed oxide or composite oxide comprising cerium and/or the at least one base metal oxide has a median particle size (D50) less than 1 μm and wherein the platinum group metal is selected from the group consisting of:
(a) platinum and rhodium; (b) palladium and rhodium; (c) platinum, palladium and rhodium; (d) palladium only; and (e) rhodium only. |
| 地址 |
London GB |
