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公开(公告)号:EP1799332B1
公开(公告)日:2017-08-23
申请号:EP05798397.5
申请日:2005-10-10
申请人: Johnson Matthey PLC
CPC分类号: F01N3/2066 , B01D53/9413 , B01D2251/208 , B01D2255/102 , B01D2255/20707 , B01D2255/20715 , B01D2255/20776 , B01D2255/30 , B01D2255/40 , B01D2255/50 , B01D2255/91 , B01D2255/9155 , B01D2257/404 , F01N3/0814 , F01N3/0842 , F01N2610/03 , Y02A50/2325 , Y02T10/24
摘要: A method of decomposing NO2 to NO in an exhaust gas of a lean-bum internal combustion engine comprises the steps of contacting an acidic metal oxide selected from the group consisting of zeolites, tungsten-doped titania, silica-titania, zirconia-titania, and mixtures of any two or more thereof with a gas mixture comprising the exhaust gas, adjusting the composition of the gas mixture, by injecting hydrocarbon therein at a rate that changes over the course of a duty cycle so that, on average over the duty cycle, the C1 hydrocarbon:nitrogen oxides ratio of the gas mixture contacting the acidic metal oxide is from 0.1 to 2.0 and passing the effluent gas directly to atmosphere optionally via first contacting the gas mixture with a hydrocarbon oxidation catalyst.
摘要翻译: 在贫燃内燃机的废气中将NO 2分解为NO的方法包括以下步骤:使选自沸石,钨掺杂的二氧化钛,二氧化硅 - 二氧化钛,氧化锆 - 二氧化钛和 其任何两种或更多种的混合物与包含废气的气体混合物的混合物,通过以在工作循环的过程中变化的速率喷射碳氢化合物来调节气体混合物的组成,使得平均地在工作循环内, 接触酸性金属氧化物的气体混合物的C1碳氢化合物:氮氧化物比率为0.1-2.0,并且任选地通过首先使气体混合物与烃氧化催化剂接触,将排出气体直接通入大气。