The effect of moisture on CO oxidation on Au/TiO 2 (110) model catalysts is investigated using temperature-programmed desorption and molecular beam reactive scattering under ultrahigh vacuum (UHV) conditions. Oxygen exchange is observed between adsorbed atomic oxygen and isotopically labeled water. Coadsorbed water (H 2 18 O) takes part in CO oxidation on O a precovered Au/TiO 2 (110) model catalysts, leading to the formation of C 16 O 18 O and C 16 O 16 O. The amount of C 16 O 18 O produced increases with increasing water coverages; however, the total amount of CO 2 produced decreases. Although coadsorbed O a and H 2 O have a minimal influence on the initial adsorption probability of CO, the total uptake of CO decreases as H 2 O coverages increase. Interestingly, the adsorption of water induces desorption of predeposited molecularly chemisorbed O 2 . Thus, adsorbed water slightly inhibits CO oxidation on atomic oxygen precovered Au/TiO 2 (110) model catalysts under UHV conditions.
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Yan et al. (2010) studied this question.
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