| 摘要 |
PURPOSE:To enhance the capacity of an exhaust gas purification catalyst, by supporting a compound of a catalytic metal selected from platinum group elements by an integral structure coated with a porous film containing activated alumina and baking the supported structure in an oxygen-containing atmosphere. CONSTITUTION:At least one or more of a catalytic metal selected from platinum group elements is supported by an integral base structure coated with a porous film containing activated alumina. Subsequently, the aforementioned carrier is baked at 400-700 deg.C in a state contacted with an atmosphere containing oxygen in an amount 0.9-1.4 times that of oxygen necessary for perfect combustion, that is, an atmosphere wherein the concn. of oxygen (O2) in combustion gas was regulated to a range of lambda=0.9-1.4 calculated according to formula to obtain an exhaust gas purification catalyst. By this method, the content of the harmful component such as chlorine remaining in the catalyst can be reduced and th enhancement of catalytic capacity is enabled. |
