发明名称 |
Filter substrate comprising zone-coated catalyst washcoat |
摘要 |
A catalyzed filter for filtering particulate matter from exhaust gas emitted from a positive ignition internal combustion engine comprises a ceramic porous wall-flow filter substrate having a total substrate length and having inlet channels defined in part by ceramic inlet wall surfaces and outlet channels defined in part by ceramic outlet wall surfaces, wherein the inlet surfaces are separated from the outlet surfaces by a first porous structure containing pores of a first mean pore size, wherein the porous substrate is coated in part with a catalyst washcoat composition, wherein a second porous structure of a washcoated part of the porous substrate contains pores of a second mean pore size, wherein the second mean pore size is less than the first mean pore size, which catalyst washcoat composition being disposed in a first zone comprising the inlet surfaces of a first substrate length less than the total substrate length, wherein a second zone comprising the outlet surfaces of a second substrate length contains no washcoat and wherein the sum of the substrate length in the first zone and the substrate length in the second zone is >100%. |
申请公布号 |
US9366166(B2) |
申请公布日期 |
2016.06.14 |
申请号 |
US201414260405 |
申请日期 |
2014.04.24 |
申请人 |
Johnson Matthey Public Limited Company |
发明人 |
Blakeman Philip Gerald;Greenwell David Robert |
分类号 |
B01D53/54;B01D53/56;B01D53/94;B01D50/00;B01J8/02;C01B21/00;C01B23/00;C01B25/00;C01B31/00;C01B33/00;C01B35/00;C01G28/00;C01G30/00;F01N3/10;B01J23/00;B01J23/02;B01J23/06;B01J23/08;B01J23/10;B01J23/40;B01J23/42;B01J23/44;B01J23/56;B01J23/70;B01J23/74;B01J21/04;F01N3/035;B01D46/24;B01D53/34;B01J35/00;F01N3/021;F01N13/00;B01J29/06;B01J35/04;F01N3/08;F01N3/022;F01N3/20 |
主分类号 |
B01D53/54 |
代理机构 |
|
代理人 |
Mangels Gary D. |
主权项 |
1. A catalysed filter for filtering particulate matter from exhaust gas emitted from a positive ignition internal combustion engine, which filter comprising a ceramic porous wall-flow filter substrate having a total substrate length and having inlet channels defined in part by ceramic inlet wall surfaces and outlet channels defined in part by ceramic outlet wall surfaces, wherein the inlet surfaces are separated from the outlet surfaces by a first porous structure containing pores of a first mean pore size, wherein the porous substrate is coated in part with a catalyst washcoat composition, wherein a second porous structure of a washcoated part of the porous substrate contains pores of a second mean pore size, wherein the second mean pore size is less than the first mean pore size, which catalyst washcoat composition being disposed in a first zone comprising the inlet surfaces of a first substrate length less than the total substrate length, wherein a second zone comprising the outlet surfaces of a second substrate length contains no washcoat and wherein the sum of the substrate length in the first zone and the substrate length in the second zone is >100%. |
地址 |
London GB |