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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
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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
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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.
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