Mazda Motor Corporation

Tokyo Roki Co., Ltd.

Toyo Kogyo Co., Ltd.

Kazunori Ihara

Hiroshi Murakami

Shigeru Yasaki

Yasutaka Yoshino

Kazuko Yamagata

Shoko Yatagai

Hiromi Ohishi

An exhaust gas purifying catalyst for use in an internal combustion engine includes a porous monolithic carrier, a catalyst coating layer formed on a surface of the monolithic carrier and containing a catalytic material capable of purifying exhaust gases, and a palladium-supporting layer formed in the catalyst coating layer at a location close to an exhaust gas inlet end of the monolithic carrier. Palladium is distributed at a high concentration in the palladium-supporting layer.

Exhaust gas purifying catalyst for use in an internal combustion engine

Exhaust purifying catalyst for use in an internal combustion engine and

A catalyst is comprised of a catalyst carrier and a coat layer containing cerium particles, active alumina particles and a catalyst component of a noble metal; and barium barium oxide is immobilized on the cerium oxide particles. The catalyst can suppress the growth of crystals of cerium oxide due to the immobilization of the barium oxide thereon, thereby improving heat resistance of the catalyst.

Catalyst for purification of exhaust gases

There is provided an improved catalyst for purifying exhaust gases comprising a carrier carrying alumina, zirconium oxide and a noble metal catalyst. The improvement resides in the fact that the carrier carries the alumina as a layer having dispersed therein the zirconium oxide particles, the zirconium oxide particles carrying said noble metal catalyst. The dispersibility of the noble metal catalytic component is thereby improved and the sintering prevention effect on the noble metal catalytic component by the zirconium oxide is effectively exhibited. Thus, the heat-proof property of the catalyst is improved and the cooperation between the noble metal catalytic component and alumina is effectively enhanced, improving longevity of the catalyst.

Catalyst for exhaust gas purification and method for producing the

A method of making a catalyst for cleaning exhaust gas from an engine including steps of preparing corrugated metallic panels and plane metallic panels, laminating the plane metallic panels with the corrugated metallic panels alternatively side by side to form a honeycomb structure of a metallic carrier, forming at least two layers of a base coat portion and an over coat portion of alumina based coating on the metallic carrier sequentially, and impregnating catalytic components into at least the outermost layer of the alumina based coating.

Catalyst and method of making the catalyst

A method of producing monolith catalysts for catalysts to be used in a measure to purify the exhaust gases of a vehicle, in which, in a process of producing alumina slurry liquid, the dispersibility of the alumina particles in the slurry liquid is improved by the use of water, aluminium-nitrate powder instead of acid, alkali to allow the slurry liquid to be uniformly adhered on the surface of the dipped carrier, thereby to prevent the alumina coat layer from coming off in the high temperature.

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Iwakuni, Japan

Kazunori Ihara