发明授权
- 专利标题: Arrangement for reducing nitrogen oxides in exhaust gases
- 专利标题(中): 用于还原废气中的氮氧化物的装置
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申请号: US12969434申请日: 2010-12-15
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公开(公告)号: US08398943B2公开(公告)日: 2013-03-19
- 发明人: Andreas Döring , Florian Wälde
- 申请人: Andreas Döring , Florian Wälde
- 申请人地址: DE
- 专利权人: MAN Truck & Bus AG
- 当前专利权人: MAN Truck & Bus AG
- 当前专利权人地址: DE
- 代理机构: Becker & Stachniak, P.C.
- 代理商 Robert W. Becker
- 优先权: DE102006031659 20060708
- 主分类号: B01D47/00
- IPC分类号: B01D47/00
摘要:
An arrangement and method for reducing the nitrogen oxide content in the exhaust gas of an internal combustion engine with the aid of ammonia and/or ammonia-releasing reduction agents, whereby ammonia and/or ammonia-containing reduction agent is added to the exhaust gas stream upstream of a catalyst combination composed of an SCR catalyst and a subsequent NH3-oxidation catalyst in such a way that a homogeneous mixture of exhaust gas and ammonia is present upstream of the SCR catalyst. To optimize the reaction or conversion of nitrogen oxides, disposed downstream of the combination of a first SCR catalyst and a first NH3-oxidation catalyst is at least one second catalyst having SCR activity in order in this way to reduce the nitrogen oxides formed at the first NH3-oxidation catalyst due to insufficient selectivity of the catalyst to nitrogen with not yet oxidized NH3.