Abstract: TiO2-CeO2 catalysts for catalytic wet air oxidation of phenol were prepared by coprecipitation. Effects of proportion of active components, calcination temperature, calcination time, and pH value during the aging process on the catalyst activity were investigated. The results indicated that keeping a constant pH of 11 during the aging was crucial for the catalytic activity of TiO2-CeO2. The microstructure of the catalysts was characterized by thermogravimetry-differential thermal analysis, N2 adsorption-desorption, X-ray diffraction, and X-ray photoelectron spectroscopy. The physical and chemical properties, such as BET specific surface area, chemisorbed oxygen, and relative content of Ce(Ⅲ) or Ti(Ⅲ) on the surface of TiO2-CeO2, had significant influence on the catalytic activity of the TiO2-CeO2 catalysts.

Key words: titanium dioxide, cerium dioxide, complex oxide catalyst, catalytic wet air oxidation, phenol