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公开(公告)号:US06973775B2
公开(公告)日:2005-12-13
申请号:US10637884
申请日:2003-08-08
IPC分类号: F02D45/00 , B01D53/86 , B01D53/94 , F01N3/08 , F01N3/10 , F01N3/20 , F01N3/24 , F01N3/28 , F02D41/02 , F02D41/04 , F02D41/38 , F01N3/00
CPC分类号: B01D53/9481 , B01D53/949 , B01D53/9495 , F01N3/0814 , F01N3/0842 , F01N3/0864 , F01N3/0885 , F02D41/028
摘要: The invention relates to a method for desulfating a nitrogen oxide storage catalyst that contains stored nitrogen oxides and sulfur oxides and that forms part of an exhaust gas purification system of a lean-burn engine. The method provides that, to initiate desulfation, the temperature of the catalyst is increased to the point where thermal desorption of the nitrogen oxides stored in the catalyst sets in, and the onset of thermal desorption of the nitrogen oxides is used as the signal to enrich the air/fuel mixture to perform the desulfation.
摘要翻译: 本发明涉及一种含有存储的氮氧化物和硫氧化物并形成贫燃发动机的排气净化系统的一部分的氮氧化物储存催化剂脱硫方法。 该方法提供的是,为了引发脱硫,催化剂的温度升高到存储在催化剂组中的氮氧化物的热解吸附和氮氧化物的热解吸开始被用作富集信号 空气/燃料混合物进行脱硫。