Exhaust gas purification catalyst
AssigneeMazda Motor Corporation
InventorsMasaaki AKAMINE, Masahiko SHIGETSU, Yasuhiro OCHI, Yuki MURAKAMI
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Abstract
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.
Claims15
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.
Dependencies are inferred from the claim text.