Catalyst for purifying exhaust gas

Abstract

Abstract PURPOSE:To obtain the title catalyst having high purification efficiency in the range from high temp. to low temp. by depositing palladium on a catalyst carrier on the gas inlet side and platinum on the catalyst carrier on the gas outlet side respectively in the specified length to form the catalyst bed. CONSTITUTION:A catalytic metal carrying layer such as an alumina coating layer is coated on the wall surface of the catalyst carrier through which through holes are bored. The carrier is dipped in a soln. of palladium chloride, etc., to the 1/10-2/5 length for the total length of the catalyst carrier from the gas inlet side of the catalyst carrier, dried, and baked to deposit palladium. The monolithic catalyst carrier is then inverted, dipped in a soln. of platinum nitrate, etc., to the 3/5-9/10 length for the total length of the catalyst carrier from the gas outlet side, dried, and baked to deposit platinum. The catalyst for purifying exhaust gas is thus obtained. Since palladium having high purification efficiency at low temp. and platinum having high purification efficiency at high temp. are appropriately deposited, high purification efficiency in the range from low temp. to high temp. is obtained.

Inventors

• 👤 Hiroaki Yamamoto
• 👤 裕朗 山本

Bibliographic Details