用共沉淀法制备了Zr0.5Ti0.5O2复合氧化物,考察了沉淀时的pH值、温度及焙烧温度对样品织构性能的影响.分别用BET、XRD、NH3-TPD对样品的织构、结构性能和表面酸性进行了表征.将经过不同温度焙烧后的样品作为载体制备成Pt/Zr0.5Ti0.5O2催化剂,考察了催化剂对C3H8、CO、NO的催化性能,并与传统的以La-Al2O3为载体的Pt/La-Al2O3汽车尾气三效催化剂进行了比较.结果表明:当沉淀时的pH=11、温度为25℃、焙烧温度为550℃时,所制得的样品具有较好的织构性能(比表面积为195m2·g-1、孔容为0.28mL·g-1)、较强的表面酸性和较宽的酸度分布;用该样品制备的汽车尾气三效催化剂与传统的以La-Al2O3作载体的Pt/La-Al2O3催化剂相比,具有更好的HC和CO催化性能和优异的NO转化性能.
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