Patent ID: 8835349
Filing Date: 2014-09-16
Classification: B01D,B01J,F01N,Y02C,Y02T

Abstract:
1. An exhaust purifying catalyst comprising: a substrate; a first-stage catalyst that includes an oxygen storage capacity material and that is provided on the substrate at an upstream side of the substrate in an exhaust gas flow direction; and a second-stage catalyst that includes an oxygen storage capacity material and that is provided on the substrate at a downstream side of the substrate in an exhaust gas flow direction, wherein the oxygen storage capacity material included in the first-stage catalyst and the second-stage catalyst includes oxygen storage capacity material on which a noble metal is not supported, a proportion of an amount of the oxygen storage capacity material, on which a noble metal is not supported, and that is included in the second-stage catalyst with respect to a combined amount of the oxygen storage capacity material, on which a noble metal is not supported, and that is included in the first-stage catalyst and the second-stage catalyst being in a range of from 0 to 50 wt %, the first-stage catalyst and the second-stage catalyst are each composed of one or more coat, at least one of the first-stage catalyst and the second-stage catalyst includes oxygen storage capacity material on which a noble metal is supported, at least a portion of the oxygen storage capacity material, on which a noble metal is not supported, is present in the same coat as the oxygen storage capacity material on which a noble metal is supported, and wherein the oxygen storage capacity material, on which a noble metal is not supported, has a pyrochlore phase-type ordered array structure.