| 发明名称 |
Zoned catalyst for treating exhaust gas |
| 摘要 |
Provided is a system for treating an exhaust gas comprising a first SCR catalyst zone comprising an iron loaded medium- or large-pore molecular sieve having a first ammonia storage capacity; and a second SCR catalyst zone comprising a copper loaded small-pore molecular sieve having a second ammonia storage capacity, wherein the first SCR catalyst zone is disposed upstream of the second SCR catalyst zone with respect to normal exhaust gas flow through the system and wherein the second ammonia storage capacity is greater than the first ammonia storage capacity. Also provided is a method for using the system to treat exhaust gas. |
| 申请公布号 |
US9597636(B2) |
申请公布日期 |
2017.03.21 |
| 申请号 |
US201514813646 |
申请日期 |
2015.07.30 |
| 申请人 |
Johnson Matthey Public Limited Company |
发明人 |
Sonntag Olivier;Genschow Tim;Newman Andrew;Tingay Isabel Zoe;Smedler Gudmund |
| 分类号 |
B01D53/94;F01N3/24;B01J35/00;B01J29/072;B01J29/76;B01J35/04;F01N3/20;B01J29/80;F01N3/08;F02B37/00;F01N3/10;F01N3/035;F01N13/00 |
主分类号 |
B01D53/94 |
| 代理机构 |
|
代理人 |
Mangels Gary D. |
| 主权项 |
1. A system for treating an exhaust gas comprising:
a. a first SCR catalyst zone comprising are iron loaded medium- or large-pore molecular sieve having a first ammonia storage capacity in mmol NH3/g catalyst; and b. a second SCR catalyst zone comprising a copper loaded small-pore molecular sieve having a second ammonia storage capacity in mmol NH3/g catalyst, wherein the first SCR catalyst zone is disposed upstream of the second SCR catalyst zone with respect to normal exhaust gas flow through the system and wherein the second ammonia storage capacity is greater than the first ammonia storage capacity and the first ammonia storage capacity is not more than about 1.5 mmol/g catalyst, and the second ammonia storage capacity is at least about 1.2 mmol/g catalyst. |
| 地址 |
London GB |
