Mitsui Minings & Melting Co., Ltd.

Honda Motor Co., Ltd.

Ryoichi Oshima

Yunosuke Nakahara

Ohki Houshito

Hiroyuki Horimura

Makoto Ogawa

Yuki Nagao

Takeshi Endo

Toshiaki Kimura

Akihiro Iimuro

Takumi Yamaguchi

To reduce an OSC material, while maintaining necessary OSC capacity; and to improve heat resistance and reactivity of a precious metal. Proposed is an exhaust gas purifying catalyst which comprises a first catalyst layer that is formed on the surface of a substrate that is formed of a ceramic or a metal, and a second catalyst layer that is formed on the upper side of the first catalyst layer. The first catalyst layer comprises a precious metal, an OSC material and an alumina, and the OSC material and the alumina are comprised at a mass ratio of OSC material:alumina=1:7 to 1:3. The second catalyst layer comprises a precious metal, an OSC material and an alumina, and the OSC material and the alumina are comprised at a mass ratio of OSC material:alumina=1:1 to 10:0.

Exhaust gas purifying catalyst

Provided is a catalyst composition using other metals different from noble metals as a catalytic activity component and which has an excellent catalytic activity even after a thermal duration treatment. Provided are an exhaust gas purifying catalyst composition which includes ceria-zirconia particles with a feature in that a peak arising from (111) plane is divided into two peak tops in an XRD pattern and in which a transition metal including at least one of Cu, Cr, Fe, Mn, Co, Ni, and Ag is supported on the ceria-zirconia particles, and a catalyst using the exhaust gas purifying catalyst composition.

Exhaust gas purifying catalyst composition and exhaust gas purifying catalyst

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Saitama, Japan

Ryoichi Oshima