用浸渍法制备了不同比例的CeO2-ZrO2复合氧化物,并用XRD,H2-TPR和BET等研究了复合氧化物的晶相、还原性能及热稳定性. 结果表明,所制备的CeO2-ZrO2复合氧化物形成了固溶体,Ce0.6Zr0.4O2比Ce0.90Zr0.10O2更容易被H2还原; 1100 ℃老化后,晶胞参数无明显变化,比表面积仍有11.8 m2/g. 模拟二冲程摩托车尾气组成,对用贵金属Pt,Pd,Rh与CeO2及CeO2-ZrO2固溶体所制备的催化剂进行了活性评价. 结果显示,1100 ℃老化后,催化剂仍具有很高的氧化活性. 在贫氧区,Pt-Pd-Rh/Ce0.6Zr0.4O2-Al2O3对碳氢化合物氧化的催化活性则有一定的优势,是一种具有较高热稳定性的催化剂.
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