Abstract
The catalytic oxidation of CO over Au/TiO 2 in an H 2-rich stream was performed under UV irradiation. It is found that UV irradiation over Au/TiO 2 promotes the preferential oxidation of CO in the H 2-rich stream. The respective chemisorption of CO, H 2 and O 2 at Au/TiO 2 can be described as a process of forming –OH or H 2O species. UV irradiation over Au/TiO 2 enhances the chemisorption of CO but suppresses the chemisorption of H 2 both at TiO 2 and Au surface. It is proposed that the photogenerated electrons from TiO 2 will cause the change of the chemisorption of CO, H 2 and O 2 at Au/TiO 2, which promotes the preferential oxidation of CO in an H 2-rich stream.
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