| 摘要 |
PURPOSE:To obtain excellent initial activity and to improve heat resistance in purifying exhaust gas under high concn. oxygen atmosphere. CONSTITUTION:Rh is dried up and deposited on the metal-containing silicate and a catalyst intermediate is produced by washcoating on a catalyst carrier, drying and calcining, then Pt and Ir are impregnated and deposited simultaneously on the intermediate by using the soln. containing Pt and Ir, then dried and calcined. In this way, the purifying catalyst for exhaust gas in which Rh is dispersed and deposited on the under layer of the catalyst and Pt and Ir are deposited adjacently on the upper layer of the catalyst. |
