从Pd纳米粒子溶胶出发,采用一步沉淀法和浸渍法分别制备了0.5％(质量分数)Pd/Ce0.6Zr0.4-xYxO2(x =0,0.03,0.05,0.1)负载型三效催化剂,考察了贵金属纳米粒子的负载方法以及Y的掺杂量对三效催化活性和水热稳定性的影响.结果表明,和浸渍法制备的催化剂相比,采用一步沉淀法制备的催化剂具有更高的三效催化活性.对于一步沉淀法制备的催化剂,Y的掺杂量对新鲜样品的三效催化活性影响不大,然而,900℃水热老化后,Y的掺杂量为0.05的Pd/Ce0.6Zr0.35Y0.05O2催化剂表现出最佳的催化活性,且其三效窗口也最为稳定.以上研究结果表明,一步沉淀法是一种从贵金属纳米溶胶出发制备纳米三效催化剂的有效方法,且在铈锫储氧材料中掺杂适量的Y元素可以进一步提高催化剂的三效催化活性和水热稳定性.
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