Nissan Motor Company Limited

Akio Iizuka

Junichi Mine

Tetsuhiko Yoneshige

Muneyuki Kubo

Michiichi Taguchi

Hidefumi Ito

A catalyst, which consists essentially of a catalytic metal, or metals, of the platinum group distributed on a carrier of active alumina and exhibits high conversion ability for CO and HC and good durability but exhibits a relatively low activity on the oxidation of SO.sub.2, is produced by impregnating the carrier with an aqueous solution containing, dissolved therein, a complex of a salt of EDTA and the catalytic metal and baking the impregnated carrier in a stream of steam at temperatures between 300 and 700.degree. C.

Method of producing catalyst for conversion of carbon monoxide and

A catalyst, which has high and long-lasting activity on both the oxidation of hydrocarbons and carbon monoxide and the reduction of nitrogen oxides particularly when an internal combustion engine is operated at an air-fuel ratio around a stoichiometric ratio, consists of a carrier of active alumina, 0.05-0.2 Wt% platinum, 0.0015-0.045 Wt% rhodium and 0.002-5 Wt% boron.

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Yokohama, Japan

Akio Iizuka