Matsushita Electric Industrial Co., Ltd.

Ikuo Matsumoto

Kenji Tabata

Hiroshi Fukuda

Shinjirou Miyahara

For the preparation of a catalytic composite for purifying exhaust gases, first, at least one perov-skite-type compound oxide of the formula RMO.sub.3, where R is La or a combination of La and Ce, and M is Co, Mn or a combination thereof, is supported together with cerium dioxide and alumina sol on a heat resistant carrier made of an inorganic oxide selected from the group consisting of cordierite and mullite, and then iron and palladium are further supported together thereon. As a result, a catalytic composite having a high degree of oxidation activity at low temperatures and also having excellent heat resistance can be obtained.

Catalytic composite for purifying exhaust gases and a method for

Exhaust smoke purifier apparatus

A catalytic composite for purifying exhaust gases is disclosed which comprises ceramic fibers, oxidation catalysts supported on the surface of the ceramic fibers and in the interstices between the ceramic fibers, and inorganic binders for binding the oxidation catalysts to the ceramic fibers, the catalytic composite being provided with vent holes for the passage of exhaust gases. Also disclosed is a method for preparing the catalytic composite.

An oxidation catalyst of the perovskite-type compound oxide which comprises, as A site, a mixture of rare earth elements from ores, part of which is replaced by at least one element selected from alkali metals, alkaline earth metals and rare earth elements other than the ore-originating elements, and a transition metal as B site. The surface atomic ratio of the mixed rare earth elements and the transition metal is in the range of 1.0:1.0 to 1.1.:1.0. A method for preparing the compound oxide is also described.

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Ikoma, Japan

Ikuo Matsumoto