发明授权
- 专利标题: Method for removing nitrogen oxides and particulates from the lean exhaust gas of an internal combustion engine and exhaust gas emission system
- 专利标题(中): 从内燃机和废气排放系统的稀薄排气中除去氮氧化物和微粒的方法
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申请号: US09850410申请日: 2001-05-08
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公开(公告)号: US06938411B2公开(公告)日: 2005-09-06
- 发明人: Michael Hoffmann , Harald Klein , Thomas Kreuzer , Adolf Schäfer-Sindlinger
- 申请人: Michael Hoffmann , Harald Klein , Thomas Kreuzer , Adolf Schäfer-Sindlinger
- 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
- 代理机构: Kalow & Springut LLP
- 优先权: DE10023439 20000512
- 主分类号: F01N3/02
- IPC分类号: F01N3/02 ; B01D46/42 ; B01D53/86 ; B01D53/94 ; B01D53/96 ; F01N3/023 ; F01N3/025 ; F01N3/035 ; F01N3/08 ; F01N3/20 ; F01N3/24 ; F01N3/28 ; F01N9/00 ; F01N13/02 ; F02D41/02 ; F02D41/04 ; F02D41/40 ; F01N3/00
摘要:
A method for removing nitrogen oxides and particulate matter from the lean exhaust gas of a combustion engine that also contains low concentrations of sulfur oxides. The exhaust gas stream is passed over a nitrogen oxide storage catalyst and a particulate filter, where nitrogen oxides and sulfur oxides are adsorbed by the storage catalyst under lean exhaust gas conditions and the particulate matter is deposited on the particulate filter. The storage catalyst is in a first cycle is periodically denitrated by enriching the exhaust gas regeneration of the particulate filter. Desulfurization of the nitrogen oxide storage catalyst is carried out in a second cycle by raising the temperature of the lean exhaust gas to a value at which the particulate matter combustion on the particulate filter is initiated and then the storage catalyst can be desulfurized by enriching the exhaust gas.