Mazda Motor Corporation

Yasuhiro Ochi

Masahiko Shigetsu

Masaaki Akamine

Yuki Murakami

Akihide Takami

Hideharu Iwakuni

Hisaya Kawabata

Susumu Mineoi

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.

Exhaust gas purification catalyst

A catalyst layer includes: a first mixed oxide particle componentwhich contains Ce and Rhand in which Rh is partially exposed at particle surfaces; and a second mixed oxide particle componentcontaining Ce, Zr, and a rare earth metal except Ce. The particle size distribution of the first mixed oxide particle componenthas a peak in the particle size range from 100 nm to 300 nm, both inclusive. The particle size distribution of the second mixed oxide particle componenthas a peak in a particle size range larger than the particle size range in which the first mixed oxide particle componenthas the peak. At least part of particles of the first mixed oxide particle componentis attached to at least part of particles of the second mixed oxide particle component

Growing community of inventors

Hiroshima, Japan

Yasuhiro Ochi