| 摘要 |
PURPOSE:To obtain a catalyst having high oxygen storage performance which can remove hydrocarbon, CO, and NOX at high conversion rate by preparing a multiple oxide carrier by simultaneous precipitation of mixed metal in a liquid phase and depositing noble metal on this carrier. CONSTITUTION:Aluminum salt is dissolved in water, to which cerium salt and zirconium salt are added and sufficiently stirred, and then aq. ammonia soln. is added to the mixture to obtain precipitate. This precipitate is baked to obtain a multiple oxide, which can be used as a carrier having Xwt.% (CeO2.ZrO2).Al2 O3 composition. (X is 5-40 and the weight ratio of CeO2 to Zr2 ranges from 70:30 to 20:80.) Then noble metal such as platinum, rhodium, etc., is made to deposit on this carrier. The obtd. catalyst is a ternary catalyst, having high oxygen storage property even after enduring high temp., and has high conversion rate. |
