发明申请
- 专利标题： Method of removing nitrogen oxides from the exhaust gas of a lean-burn internal combustion engine and exhaust-gas purification system therefor
- 专利标题（中）： 从稀燃内燃机的废气中除去氮氧化物的方法及其废气净化系统
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申请号： US10547249申请日： 2004-02-26
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公开(公告)号： US20070051096A1公开(公告)日： 2007-03-08
- 发明人: Markus Pfeifer , Barry Van Setten , Paul Spurk , Yvonne Demel , Tobias Kuhl , Jurgen Gieshoff , Egbert Lox , Thomas Kreuzer
- 申请人： Markus Pfeifer , Barry Van Setten , Paul Spurk , Yvonne Demel , Tobias Kuhl , Jurgen Gieshoff , Egbert Lox , Thomas Kreuzer
- 申请人地址： DE HANAU 63457
- 专利权人： UMICORE AG CO. KG
- 当前专利权人： UMICORE AG CO. KG
- 当前专利权人地址： DE HANAU 63457
- 优先权： DE10308288.3 20030226
- 国际申请： PCT/EP04/01944 WO 20040226
- 主分类号： F01N3/00
- IPC分类号： F01N3/00 ; F01N3/10
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.