| 摘要 |
PURPOSE:To prevent the formation of a malodor causing H2S by depositing at least one of Ni, Co and Fe on powdery Ce compound, vice versa, using the resulting product to form on a refractory support the oxide coating layer containing at least one of Al:Ce:Ni, Co and Fe and La in a predetermined molar ratio, depositing at least one of Pt, Pd and Rh thereon and using the catalyst thus formed to clean up the exhaust gases emitted from vehicles. CONSTITUTION:At least one of Ni, Co and Fe is deposited on powdery Ce compound having an average particle diameter of not less than 0.1mm. The resulting product is used to form on a refractory support the oxide coating layer containing at least one of Al:Ce:Ni, Co and Fe and La in the molar ratio of 2:01-0.6:0.01-1.2:0.01-0.1 and at least one of Pt, Pd and Rh is deposited thereon, whereby H2S is not formed upon enriching the air/fuel ration of exhaust gases and whereby the clean-up rates of HC, CO and NOX remain unchanged from the conventional ones. |
