Low-Temperature Complete Combustion of Volatile Organic Compounds over Novel Pt/CeO2-ZrO2-SnO2/γ-Al2O3 Catalysts

Catalytic combustion of volatile organic compounds (VOCs) such as ethylene, toluene, and acetaldehyde over novel Pt/CeO2-ZrO2-SnO2/gamma-Al2O3 catalysts prepared by a coprecipitation method was investigated. The introduction of a small amount of SnO2, within the CeO2-ZrO2 lattice as a promoter was considerably effective to enhance the oxygen release and storage abilities of the catalysts, so that complete oxidation of VOCs was markedly activated. This improvement of the reducibility of the catalyst can be ascribed to the simultaneous reduction of Ce4+ and Sn4+ in the CeO2-ZrO2-SnO2 solid solutions. By the optimization of the composition and the Pt amount, complete oxidation of ethylene, toluene, and acetaldehyde was realized at temperatures as low as 55, 110, and 140 degrees C over a Pt(10 wt %)/Ce0.68Zr0.17Sn0.15-O-2.0(16 wt %)/gamma-Al2O3 catalyst, respectively.