Toyota Jidosha Kabushiki Kaisha

Cataler Corporation

Motoya Abe

Akiya Chiba

Isao Naito

Takaaki Kanazawa

Shunsuke Haga

An exhaust gas purifying catalyst with an excellent effect of suppressing deterioration due to aggregation of a noble metal catalyst during endurance at high temperature, and a production method therefor. The method for producing the exhaust gas purifying catalyst that has a porous carrier and a noble metal catalyst supported thereon includes: preparing the porous carrier that contains alumina-ceria-zirconia composite oxide particles and has physical property values, after subjected to baking at 900&#xb0; C. for 5 hours, of a pore diameter of the particles in the range of 2 to 20 nm, a specific surface area of the particles in the range of 75 to 115 m/g, a crystallite size of a ceria-zirconia composite oxide contained in the particles in the range of 4 to 6 nm, and a bulk density of the particles in the range of 0.5 to 0.9 cm/g, and bringing a noble metal chemical solution having an aggregate of platinum or the like with a grain size adjusted to less than or equal to 1 nm with the use of a platinum nitric acid solution or the like, into contact with the porous carrier, so that the noble metal catalyst is supported on the porous carrier.

Exhaust gas purifying catalyst and method for producing the same

A rhodium-loading solution characterized by comprising rhodium atoms and an organic base in a molar ratio of 1:0.5-35.

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Kakegawa, Japan

Motoya Abe