EXHAUST GAS PURIFYING CATALYST FOR ENGINE AND ITS MANUFACTURE

摘要

PROBLEM TO BE SOLVED: To retain the purifying performance of exhaust gas in a good state for a long period of time by effectively preventing the heat deterioration of catalyst active species composed of palladium oxide. SOLUTION: An exhaust purifying catalyst is provided on an exhaust system of an engine, and an HC adsorbent layer 3 with a number of pores is formed on a catalyst carrier 1 composed of a monolithic carrier. Co-catalysts 4 composed of serium oxide and catalyst active species 5 composed of palladium oxide 6 to which rhodium oxide 7 is added are carried on the HC adsorbent layer 3.