采用共沉淀法制备了不同碱土金属掺杂的Ce0.35Zr0.55M0.1 0O1.90(CZM;M=Mg,Ca,Sr或Ba)同溶体,并采用N2吸附-脱附、储氧量测定、程序升温还原和x射线衍射对其进行了表征.以CZM和La-A1203为载体,制备了负载型低贵金属Pt-Rh三效催化剂,并考察了其催化活性.结果表明,经600℃焙烧5h后,CZCa样品的比表面积为109m2/g,经1 000℃老化5h后仍有47m2/g.所有新鲜样品均具有较低的还原温度和良好的还原性能.老化后的CZCa仍具有较好的还原性能和较高的储氧量.在600℃下焙烧的样品均为立方晶相;经1 000℃老化5 h后,只有CZMg发生相分离,其余样品仍为稳定的立方晶相.活性测试结果表明,所有新鲜催化剂均具有良好的低温起燃性能;经1 000.C水热老化5h后,含有CZCa的催化剂仍具有较低的起燃温度,表现出优异的抗老化性能.
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