首页> 外国专利> METHOD FOR DECREASING NITROGEN OXIDES IN HYDROCARBON-CONTAINING EXHAUST GASES USING AN SCR CATALYST BASED ON A MOLECULAR SIEVE

METHOD FOR DECREASING NITROGEN OXIDES IN HYDROCARBON-CONTAINING EXHAUST GASES USING AN SCR CATALYST BASED ON A MOLECULAR SIEVE

机译:基于分子筛的SCR催化剂降低含气废气中氮氧化物的方法

摘要

The invention relates to an arrangement for treating diesel engine exhaust gases containing nitrogen oxides (NO x) and hydrocarbons (HC), wherein an SCR system comprising an SCR catalyst and a reducing agent injector is disposed in front of an oxidation catalyst, the SCR catalyst comprising one with copper And / or iron (Fe) exchanged zeolites and the zeolite is such that the hydrocarbons contained in the exhaust gas by the molecular sieve effect of the zeolite from the active centers in the catalyst, where the reactions take place, are kept away, said Zeolite has a largest lower channel width of 2.6 Å - 4.2 Å.
机译:本发明涉及一种用于处理包含氮氧化物(NO x)和碳氢化合物(HC)的柴油发动机废气的装置,其中在氧化催化剂(SCR催化剂)的前面设置包括SCR催化剂和还原剂喷射器的SCR系统。包含一种与铜和/或铁(Fe)交换的沸石的沸石,该沸石使得通过催化剂的活性中心通过沸石的分子筛效应保持废气中所含的碳氢化合物发生反应。据说沸石的最大下通道宽度为2.6Å-4.2Å。

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