Patent ID: 6143691
Filing Date: 2000-11-07
Classification: B01D,B01J,Y02A,Y02T

Abstract:
A catalyst for purifying the exhaust gas from an internal combustion engine, said catalyst containing rhodium, palladium, a cerium compound having a BET surface area of not less than 20 m.sup.2 /g and a crystal diameter of not more than 200 A as determined by XRD, and a refractory inorganic oxide as catalyst components, carried on a refractory carrier, in at least a first catalyst superposed on a second inner catalyst layer, said first catalyst layer containing said rhodium, said cerium compound and substantially free of palladium, and said second catalyst layer containing said palladium containing said cerium compound in an amount of not more than 3% by weight as CeO.sub.2 based on the weight of the second catalyst layer, and substantially free of rhodium.