公开(公告)号：DE3841990A1

公开(公告)日：1990-06-21

申请号：DE3841990

申请日：1988-12-14

Applicant: DEGUSSA

Inventor： BAACKE MICHAEL DR ,  BRAND REINHOLD DR ,  ENGLER BERND H DR ,  KISS AKOS DR ,  KLEINE-MOELLHOFF P DIPL ING ,  KLEINSCHMIT PETER DR ,  KOBERSTEIN EDGAR DR ,  SIRAY MUSTAFA DR

IPC: B01D53/86 ,  B01D53/56 ,  B01D53/94 ,  B01J29/18 ,  B01J29/20 ,  B01J29/24 ,  B01J29/26

Abstract: A zeolite catalyst and a method for reduction of nitrogen oxides present in waste gas streams is described. The method includes mixing the waste gas containing nitrogen oxides with ammonia. At an elevated temperature, this mixture is passed over a zeolite catalyst. Preferably, the zeolite catalyst is in a monolithic or honeycomb form. The zeolite catalyst includes one or more of the following subgroup metals: copper, iron, molybdeum and cerium. The zeolite catalysts made in accordance with this invention show better conversion of nitrogen oxides and longer life than known catalysts.