采用水热合成法制备了形貌规则的纳米氧化铈颗粒,分别为棒状、立方体和多面体,通过溶胶沉积法将金颗粒沉积到不同形貌氧化铈表面制得了Au/CeO2催化剂. 考察了催化剂载体的不同形貌对CO催化氧化反应活性的影响. 实验结果表明,棒状(110+100)和多面体(111+100)氧化铈作为载体时的催化剂活性比立方体(100)作为载体时的活性高. 在低温段,多面体氧化铈作为载体的催化剂表现出较高活性,而在高温范围,棒状氧化铈作为载体的催化剂的催化活性最好.
Uniformly distributed crystalline nanorods, nanocubes, and nanopolyhedra of ceria were prepared by a hydrothermal method. Au colloid nanoparticles were deposited on the surface of these ceria to obtain Au/CeO2 catalysts. Their catalytic activity for CO oxidation was evaluated, and the effect of the ceria morphology on the activity was investigated. As a support, nanorod (110+100) and nanopolyhedra (111+100) ceria exhibit higher activity than nanocube (100) ceria. At the lower temperature, Au/nanopolyhedra ceria exhibited better activity, while Au/nanorod ceria was the best catalyst at higher temperature.
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