| 摘要 |
PURPOSE:To develop a catalyst showing excellent purifying capacity to the exhaust gas discharged from the internal combustion engine of a car even at low temp. and even after high temp. endurance. CONSTITUTION:An exhaust gas purifying catalyst is constituted by supporting at least one kind of a platinum group element, activated alumina, cerium oxide, zirconium oxide stabilized with cerium oxide and oxide of one or more kinds of a metal selected from lanthanum, yttrium, neodymium and an element selected from the Groups IIA, IIIB and an arbitrary zirconium compound on a support having a monolithic structure. In the case of the evaluation on a purifying rate at low temp. after high temp. endurance, this catalyst can enhance a prifying rate against all of prescribing substances (CO, HC, NOx) as compared with a conventional catalyst. |
