发明名称 |
Exhaust gas treatment unit for internal combustion engines and processes for operatin therm |
摘要 |
The present invention provides an exhaust gas treatment unit for an internal combustion engine. A first catalyst unit produces ammonia from corresponding constituents in a rich exhaust gas composition. A second catalyst unit that is located downstream of the first catalyst unit temporarily stores the ammonia produced by the first catalyst unit in the presence of a rich exhaust gas composition. In the presence of a lean exhaust gas composition, the nitrogen oxides present in the exhaust gas are subjected to a reduction reaction using the temporarily stored ammonia as reducing agent. The exhaust gas treatment unit also contains a third catalyst unit that is located between the other two catalyst units, and oxidizes the nitrogen oxides present in the exhaust gas at lean exhaust gas conditions to a such an extent that 25 to 75 vol. % of the nitrogen oxides entering the second catalyst unit consist of nitrogen dioxide. |
申请公布号 |
US2002116920(A1) |
申请公布日期 |
2002.08.29 |
申请号 |
US20020058685 |
申请日期 |
2002.01.28 |
申请人 |
OMG AG & CO. KG |
发明人 |
PFEIFER MARCUS;SETTEN BARRY VAN;GIESHOFF JURGEN;SPURK PAUL;LOX EGBERT;KREUZER THOMAS |
分类号 |
F01N3/28;B01D53/94;F01N3/08;F01N3/20;F01N3/24;F01N13/02;(IPC1-7):F01N3/00;F01N3/10 |
主分类号 |
F01N3/28 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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