CATALYST AND METHOD FOR THE REDUCTION OF NITROGEN OXIDES,申请号US201414763241-传众专利搜索

CATALYST AND METHOD FOR THE REDUCTION OF NITROGEN OXIDES

申请公布号：US2015352495(A1)

申请号：US201414763241

申请日期：2014.02.21

申请公布日期：2015.12.10

申请人：

UMICORE AG & CO. KG

发明人：HOYER Ruediger;SCHULER Anke;UTSCHIG Thomas;MUELLER Elena

分类号：B01D53/94;B01J35/02;B01J23/46;B01J35/00;B01J23/10;B01J23/44

主分类号：B01D53/94

地址：Hanau-Wolfgang DE

摘要：The present invention relates to a nitrogen oxide storage catalyst composed of at least two catalytically active washcoat layers on a support body, wherein a lower washcoat layer A contains cerium oxide, an alkaline earth metal compound and/or an alkali metal compound, and also platinum, and an upper washcoat layer B disposed atop the washcoat layer A, containing cerium oxide, and also platinum and palladium, and no alkaline earth metal compound, and a method for converting NOx in the exhaust gases of motor vehicles which are operated with lean-burn engines.

主权项：1. A nitrogen oxide storage catalyst composed of at least two catalytically active washcoat layers on a support body,wherein a lower washcoat layer A contains cerium oxide, an alkaline earth metal compound and/or an alkali metal compound, and also platinum, and an upper washcoat layer B disposed atop the washcoat layer A contains cerium oxide, and also platinum and/or palladium, and no alkaline earth metal compound,and wherein the washcoat layer B is present in an amount of 50 to 200 g/L, based on the volume of the support body, and the minimum proportion by mass in % of cerium oxide in the washcoat layer B is calculated from the formula 0.1×amount of washcoat layer B in g/L+30.