发明名称 |
Method of removing nitrogen oxides from the exhaust gas of a lean-burn internal combustion engine and exhaust-gas purification system therefor |
摘要 |
The present invention relates to a method of removing nitrogen oxides from the exhaust gas of a lean-burn internal combustion engine by selective catalytic reduction (SCR) using ammonia. The exhaust gas is routed first over a platinum-containing pre-catalyst and then over an SCR catalyst. The ammonia needed for the selective catalytic reduction is added to the exhaust gas upstream of the pre-catalyst at an exhaust-gas temperature below 250° C., while it is supplied to the exhaust gas between the pre-catalyst and the SCR catalyst at an exhaust gas temperature above 150° C. By adopting this procedure, a very large temperature range for the selective catalytic reduction with high nitrogen conversion rates is obtained. |
申请公布号 |
US2007051096(A1) |
申请公布日期 |
2007.03.08 |
申请号 |
US20040547249 |
申请日期 |
2004.02.26 |
申请人 |
UMICORE AG CO. KG |
发明人 |
PFEIFER MARKUS;VAN SETTEN BARRY;SPURK PAUL;DEMEL YVONNE;KUHL TOBIAS;GIESHOFF JURGEN;LOX EGBERT;KREUZER THOMAS |
分类号 |
F01N3/00;B01D53/94;F01N3/10;F01N3/20;F01N13/02 |
主分类号 |
F01N3/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|