| 摘要 |
PURPOSE:To provide a catalyst for controlling the evolution of H2S while maintaining a ternary catalytic characteristic by providing an activated alumina with precious metals deposited thereon and adding alkali metal and cerium oxide thereon. CONSTITUTION:In a catalyst for cleanup of exhaust gases emitted from a vehicle, there is provided an activated alumina of 1 - 20g on which platinum and/or palladium of 5 - 30wt.% and rhodium of 1 - 20wt.% are deposited. A honeycomb carrier is covered with a cerium oxide of 10 - 150g, an activated alumina of 50 - 200g and an alkali metal such as Na and K of 0.5 - 30g per liter of catalyst. The catalyst thus formed controls the reduction of SOx to H2S, being excellent in the cleanup performance of hydrocarbon, CO, NOx, etc. |
