Patent ID: 9138731
Filing Date: 2015-09-22
Classification: B01D,B01J,F01N,Y02A,Y02T

Abstract:
1. Extruded honeycomb catalyst for nitrogen oxide reduction according to the selective catalytic reduction (SCR) method in exhaust gases from motor vehicles, comprising an extruded catalyst carrier in honeycomb form comprising a first SCR catalytically active component and with a plurality of channels through which the exhaust gas flows during operation, and a washcoat coating comprising a second SCR catalytically active component, the washcoat coating being in the form of a layer having a thickness of 30 to 100 μm applied to the extruded catalyst carrier, wherein the first SCR catalytically active component and the second SCR catalytically active component are each independently selected from the group consisting of: (i) vanadium catalyst with vanadium as catalytically active component; (ii) mixed-oxide catalyst with one or more of cerium oxide, zirconium oxide, and tungsten oxide as catalytically active component; and (iii) an Fe- or a Cu-zeolite catalyst wherein the proportion of active components in the extruded catalyst carrier is 10 to 60 vol. %.