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Catalytic combustion of volatile organic compounds (VOCs) was investigated on supported precious metal catalysts. The activities for the combustion of methane and acetaldehyde were closely related to the reducibility of the precious metal oxides of the catalysts. On the other hand, light-off temperatures for toluene combustion on PdO/Al2O3, PdO/SnO2, and PdO/CeO2 were around 200 °C, although PdO/ZrO2 showed a higher temperature of 240 °C. This result indicated that light-off temperatures depend on not only the catalytic activities but also the catalyst structure because of low concentration of toluene and weak interaction between catalysts and toluene. In this experiment, the PdO/SnO2 catalyst showed highest activity for the combustion of methane and VOCs. [ABSTRACT FROM AUTHOR]