发明名称 |
NO<sub>x </sub>trap composition |
摘要 |
A method to produce a NOx trap composition, and its use in a NOx trap and in an exhaust system for internal combustion engines, is disclosed. The NOx trap composition is produced by heating an iron-containing zeolite in the presence of an inert gas and an organic compound to produce a reductively calcined iron/zeolite. A palladium compound is then added to the reductively calcined iron/zeolite, and the resulting Pd—Fe/zeolite is then calcined at 400 to 600° C. in the presence of an oxygen-containing gas to produce the NOx trap composition. The NOx trap composition shows low temperature NO capacity below 200° C., as well as an additional NO storage temperature window in the 200 to 250° C. range. |
申请公布号 |
US9005560(B2) |
申请公布日期 |
2015.04.14 |
申请号 |
US201414182477 |
申请日期 |
2014.02.18 |
申请人 |
Johnson Matthey Public Limited Company |
发明人 |
McKenna Fiona-Mairead |
分类号 |
B01D53/94;B01J29/00;B01J29/064;F01N3/10;F01N3/28;B01J37/00;B01J29/74;B01J29/76;B01J37/16;B01J29/072;F01N3/20;B01J37/08 |
主分类号 |
B01D53/94 |
代理机构 |
|
代理人 |
Carroll Kevin M. |
主权项 |
1. A method to produce a NOx trap composition comprising:
(a) heating an iron-containing zeolite in the presence of an inert gas and an organic compound to produce a reductively calcined iron/zeolite; (b) adding a palladium compound into the reductively calcined iron/zeolite to form a Pd—Fe/zeolite; and (c) calcining the Pd—Fe/zeolite at 400 to 600° C. in the presence of an oxygen-containing gas to produce the NOx trap composition. |
地址 |
London GB |