Exhaust gas purification catalyst

摘要

An exhaust gas purification catalyst includes a catalytic layer containing a particle component A-1 and a particle component A-2 with different catalytic metal contents, each of which is composed of catalytic-metal-doped CeZr-based mixed oxide powder. The particle component A-1 having the lower catalytic metal content is supported on a particle component B composed of Zr-based-oxide-supported alumina powder, and the particle component A-2 having the higher catalytic metal content is supported on a particle component C composed of CeZr-based mixed oxide powder in which catalytic metal is not solid-dissolved.

主权项

1. An exhaust gas purification catalyst, comprising:
a catalytic layer containing a particle component A composed of catalytic-metal-doped CeZr-based mixed oxide powder in which catalytic metal is solid-dissolved in CeZr-based mixed oxide, a particle component B composed of Zr-based-oxide-supported alumina powder in which Zr-based oxide is supported on activated alumina particles, and a particle component C composed of CeZr-based mixed oxide powder in which catalytic metal is not solid-dissolved, wherein the particle component A includes a particle component A-1 and a particle component A-2 which have different contents of catalytic metal in the catalytic-metal-doped CeZr-based mixed oxide, at least a part of the particle component A-1 is supported on the particle component B, and at least a part of the particle component A-2 is supported on the particle component C, and the content of catalytic metal is lower in the particle component A-1 than the particle component A-2.