Effect of the Morphology of the Ceria Support on the Activity of Au/CeO2 Catalysts for CO Oxidation

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.