Patent ID: 8318630
Filing Date: 2012-11-27
Classification: B01D,B01J,Y02A,Y02T

Abstract:
1. A catalyst for removing nitrogen oxides comprising a monolithic support coated with (a) a lower layer containing catalytic component A comprising cerium oxide and at least a refractory inorganic oxide wherein the content of the refractory inorganic oxide contained in said catalytic component A is 2 to 100 parts by mass relative to 100 parts by mass of cerium oxide, and (b) an upper layer containing catalytic component B comprising (b-1) at least one metal selected from a group consisting of copper, manganese, iron, cobalt and nickel or a metal compound thereof, (b-2) zeolite, wherein the content of the metal or the metal compound (the metal/metal compound) contained in the upper layer is 1.0 to 30.0 parts by mass relative to 100 parts by mass of zeolite, and (b-3) at least a refractory inorganic oxide, wherein the content of said refractory inorganic oxide in the upper layer is 10-100 parts by mass relative to 100 parts by mass of the total of the metal/metal compound and zeolite.