Mazda Motor Corporation

Other

Takahiro Kurokawa

Akihide Takami

Hideharu Iwakuni

Makoto Kyogoku

Hiroshi Murakami

Kenji Okamoto

Kenichi Yamamoto

Hiroshi Yamada

Hirosuke Sumida

Shinichi Tanioka

Tadashi Tokuyama

Yoko Kawakami

Hirosou Oda

An exhaust gas emission control catalyst includes an under catalyst layer containing at least one of barium and lanthanum and an over catalyst layer containing an agent for absorbing water in a gas, at least one of the under catalyst layer and over catalyst layer containing catalytic metal.

Burned gas purifying catalyst

A catalytic base material for an exhaust gas purifying catalyst is produced by impregnating ceria powders with a barium contained solution and heating the ceria particles at approximately 400 to 1100&deg; C. to create and accumulate barium oxides fixed to surfaces of the ceria particles.

Material for exhaust gas purifying catalyst, exhaust gas purifying catalyst made of the material and method for producing the exhaust gas purifying catalyst

A catalyst has a base catalyst layer containing platinum and barium as precious metal supported by alumina and an over catalyst layer containing platinum and rhodium as precious metal supported by zeolitr. The platinum and rhodium in the over catalyst layer activate NOx and HC so as to make them more reactive in terms of energy, and the barium in the base catalyst layer makes the platinum be more dispersive in the base catalyst layer. Under the existence of dispersive platinum, NOx in exhaust gas is decomposed and purified by reaction with reactive NO.sub.2 and partially oxidized HC generated in the over catalyst layer.

Catalyst for purifying exhaust gas

Growing community of inventors

Hiroshima, Japan

Takahiro Kurokawa