| 摘要 |
PURPOSE:To enhance purification efficiency, by using a catalyst formed by adhering a slurry, which is prepared by compounding a cerium-containing activated alumina powder and a cerium oxide powder in an alumina sol, to the surface of a monolithic carrier base material before supporting a noble metal component. CONSTITUTION:Activated alumina supporting cerium oxide in an amount of 1- 5% by wt. of alumina as a cerium metal is obtained. A cerium oxide powder with a specific surface area of 50m<2>/g or more is compounded in said activated alumina powder along with water to obtain an aqueous slurry which is, in turn, compounded and slurried in an alumina sol. The resulting slurry is adhered to the surface of a monolithic carrier base material and a noble metal component such as platinum, rhodium or palladium is subsequently supported by said carrier base material. |
