Matsushita Electric Industrial Co., Ltd.

Tatsuro Miyazaki

Masahiro Inoue

Nobuyuki Tokubuchi

Masaaki Arita

Kazuhiko Noda

Kensei Fukuda

Shoichi Shimizu

Mashaaki Arita

Shouji Kuroda

Yota Hashimoto

The present invention provides the exhaust gas purification catalysts containing a first catalyst component comprising an inorganic oxide having heat resistance and a transition metal oxide supported on the surface of the inorganic oxide and a second catalyst comprising at least one alkali metal sulfate, which have a high catalytic activity for the burning of particulates.

Exhaust gas purification catalyst and exhaust gas purification material

The particulates, etc. deposited on the trap are burnt in such a manner that the trap is heated so that the temperature of the trap does not exceed 500&deg; C. or the maximum temperature gradient in radial direction of the trap is 20&deg; C./mm or less, preferably 10&deg; C./mm or less.

Method for purification of exhaust gas

A catalyst for exhaust gas purification characterized by high catalytic activity, heat resistance, and toxin resistance includes a metal oxide and at least one alkali metal sulfate or at least one alkaline earth metal sulfate. The process for producing the catalyst includes mixing the metal oxide with an aqueous solution of the sulfate, evaporating the mixture to dryness, and heat-treating the resultant mixed powder. An exhaust gas purifying apparatus includes an exhaust gas purifying filter having a high exhaust gas purification rate and an excellent durability. The filter includes a ceramic filter with a heat-resistant coating layer thereon for support of the catalyst.

Catalyst for purifying exhaust gas, process for production thereof,

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Fukuoka, Japan

Tatsuro Miyazaki