Ceria-Modified Clay Supported Palladium Catalysts for Complete Oxidation of Volatile Organic Compounds

摘要

Ceria- and alumina-pillared interlayered clays were synthesized in the presence of PEO surfactant by using la-ponite clay as raw material. And the synthesized pillared clays were used as supports to load palladium catalysts for complete oxidation of benzene. Nitrogen adsorption/ desorption experiments reveal that the pillared clays have higher specific surface area of more than 400 m~2 • g~(-1) and larger total pore volume of more than 0.75 m~2 • g~(-1). The activity tests show that ceria pillar exhibited promoting effect on the activity of the palladium catalysts, and ceria-pillared clay supported palladium catalyst catalyzed the complete oxidation of benzene at less than 250°C. The calcination temperature affects the activity of the catalysts significantly, and it is found that the optimal calcination temperature are 600 and 400°C for ceria- and alumina-pillared clay supported palladium catalysts, respectively.