PURPOSE: To reduce the deactivation of the titled catalyst due to poisoning and to enhance the catalytic activity by coating and depositing a metallic catalyst over the whole surface of a highly porous carrier consisting essentially of calcium aluminate powder, and heat-treating the material to mold an exhaust gas purifying catalyst.
CONSTITUTION: A pasty mixture consisting essentially of calcium aluminate powder and added with aggregate, a molding assistant, and water is prepared. The mixture is then molded, cured, and dried to form a highly porous carrier. A metallic catalyst component is deposited on the highly porous carrier, and the whole surface of the carrier is coated with metal to obtain the porous catalyst for purifying exhaust gas. Nickel, copper, chromium, cobalt, etc., are used as the catalytic metal to be coated, and molten silica, titanium dioxide, etc., are used as the aggregate. In the heat treatment at about 1,000°C, the specific surface is not changed and remains at a high value of 15W20m2/g, and the catalytic activity is not deteriorated under high temp. conditions.
ITO KUNIO
MATSUMOTO ISAO
