| 摘要 |
PURPOSE:To prepare the title catalyst having high purifying capacity at low temp. by coating a monolithic carrier with a catalyst composition containing cerium oxide stabilized by specific oxides, activated alumina and a platinum group metal. CONSTITUTION:A honeycomb carrier having a monolithic structure is impregnated with a solution containing cerium oxide (I) stabilized by zirconium oxide and/or zirconium hydroxide, at least one kind of a salt selected from an yttrium salt and a calcium salt, at least one kind of a salt of a rare earth element (excepting yttrium and cerium) and a cerium salt. Subsequently, the impregnated carrier is baked to prepare a catalyst for purifying exhaust gas. The rare earth element is pref. contained in stabilized cerium oxide (I) in an amount of 0.1-15wt.%. Rhodium can be supported in an amount of 0.02-2wt.% on a catalyst composition, and platinum and palladium can be respectively supported in an amount of 0-10wt.% on a catalyst composition (it is excepted that the sum of platinum and palladium is 0wt.%). |
