- 专利标题: Process and catalyst for reducing nitrogen oxides
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申请号: US11037551申请日: 2005-01-18
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公开(公告)号: US20050196333A1公开(公告)日: 2005-09-08
- 发明人: Adolf Schafer-Sindlinger , Marcus Pfeifer , Paul Spurk , Yvonne Demel , Thomas Kreuzer , Egbert Lox
- 申请人: Adolf Schafer-Sindlinger , Marcus Pfeifer , Paul Spurk , Yvonne Demel , Thomas Kreuzer , Egbert Lox
- 申请人地址: DE Hanau-Wolfgang
- 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-Wolfgang
- 优先权: DE10020100.8 20000422
- 主分类号: F01N3/08
- IPC分类号: F01N3/08 ; B01D53/34 ; B01D53/56 ; B01D53/74 ; B01D53/86 ; B01D53/94 ; B01J8/02 ; B01J21/00 ; B01J23/80 ; B01J29/06 ; B01J29/064 ; B01J29/072 ; B01J29/076 ; B01J29/46 ; B01J35/04 ; B01J37/02 ; B01J37/30 ; C01B21/00 ; C01B21/04 ; F01N3/10 ; F01N3/20 ; F01N3/28
摘要:
A process for reducing the nitrogen oxides present in a lean exhaust gas from an internal combustion engine by selective catalytic reduction on a reduction catalyst using ammonia, wherein a fraction of the nitrogen monoxide present in the exhaust gas is oxidized to nitrogen dioxide before the exhaust gas, together with ammonia, is passed over the reduction catalyst. The reduction catalyst contains a zeolite exchanged with transition metals and oxidation of the nitrogen monoxide is performed in such a way that the exhaust gas contains 30 to 70 vol. % of nitrogen dioxide before contact with the reduction catalyst.
公开/授权文献
- US07005116B2 Process for reducing nitrogen oxides 公开/授权日:2006-02-28