Abstract: Three CeO2 samples were prepared by precipitation with urea, ammonia, and sodium carbonate. Vanadium oxide was supported on these CeO2 materials, and their catalytic activity in the total oxidation of chlorobenzene was investigated. Their turnover frequencies for chlorobenzene oxidation are 4.9, 1.6, and 0.8 h-1at 300 ℃, respectively, and depend on the redox properties of the CeO2 supports. These results demonstrate that the oxygen of theV-O-Cebond plays an important role in determining the catalytic activity of the VOx/CeO2 catalyst.

Key words: cerium oxide, vanadium oxide, supported catalyst, redox property, chlorobenzene, catalytic oxidation