| 摘要 |
PURPOSE:To prepare a catalyst showing high durability in a high temp. oxidative atmosphere, by a method wherein a supported carrier formed by allowing a refractory ceramic catalyst carrier to adhere platinum or Pd and a supported carrier formed by allowing rare earth element oxide to adhere Rh are mixed and the resulting mixture is applied to a substrate as a slurry. CONSTITUTION:In a method for preparing an exhaust gas treating catalyst showing high durability in a high temp. oxidative atmosphere and simultaneously removing CO, hydrocarbon and nitrogen oxide in exhaust gas, a supported carrier A obtained by adhering at least one metal selected from a group consisting of platinum and Pd to a refractory ceramic catalyst carrier (e.g., activated alumina) and a supported carrier B obtained by adhering Rh to rare earth element oxide are mixed and the resulting mixture is ground along with an org. binder (e.g., a boemite alumina sol stabilized with hydrochloric acid) and water to form a slurry which is, in turn, applied to a refractory ceramic substrate to be dried and baked. The resulting catalyst shows good durability even in a high temp. oxidative atmosphere and excellent catalystic activity. |
