The effect of adsorbed water in CO oxidation on Au/TiO2(110)

Ting Yan; Jinlong Gong; David W. Flaherty; C. Buddie Mullins

doi:10.1021/jp109295u

The effect of adsorbed water in CO oxidation on Au/TiO₂(110)

Ting Yan, Jinlong Gong, David W. Flaherty, C. Buddie Mullins

Research output: Contribution to journal › Article › peer-review

Abstract

The effect of moisture on CO oxidation on Au/TiO₂(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 (H₂¹⁸O) takes part in CO oxidation on O_a precovered Au/TiO₂(110) model catalysts, leading to the formation of C¹⁶O¹⁸O and C¹⁶O ¹⁶O. The amount of C¹⁶O¹⁸O produced increases with increasing water coverages; however, the total amount of CO₂ produced decreases. Although coadsorbed O_a and H₂O have a minimal influence on the initial adsorption probability of CO, the total uptake of CO decreases as H₂O coverages increase. Interestingly, the adsorption of water induces desorption of predeposited molecularly chemisorbed O₂. Thus, adsorbed water slightly inhibits CO oxidation on atomic oxygen precovered Au/TiO₂(110) model catalysts under UHV conditions.

Original language	English (US)
Pages (from-to)	2057-2065
Number of pages	9
Journal	Journal of Physical Chemistry C
Volume	115
Issue number	5
DOIs	https://doi.org/10.1021/jp109295u
State	Published - Feb 10 2011
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
General Energy
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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10.1021/jp109295u

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title = "The effect of adsorbed water in CO oxidation on Au/TiO2(110)",

abstract = "The effect of moisture on CO oxidation on Au/TiO2(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 (H218O) takes part in CO oxidation on Oa precovered Au/TiO2(110) model catalysts, leading to the formation of C16O18O and C16O 16O. The amount of C16O18O produced increases with increasing water coverages; however, the total amount of CO2 produced decreases. Although coadsorbed Oa and H2O have a minimal influence on the initial adsorption probability of CO, the total uptake of CO decreases as H2O coverages increase. Interestingly, the adsorption of water induces desorption of predeposited molecularly chemisorbed O2. Thus, adsorbed water slightly inhibits CO oxidation on atomic oxygen precovered Au/TiO2(110) model catalysts under UHV conditions.",

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AU - Yan, Ting

AU - Gong, Jinlong

AU - Flaherty, David W.

AU - Mullins, C. Buddie

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Y1 - 2011/2/10

N2 - The effect of moisture on CO oxidation on Au/TiO2(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 (H218O) takes part in CO oxidation on Oa precovered Au/TiO2(110) model catalysts, leading to the formation of C16O18O and C16O 16O. The amount of C16O18O produced increases with increasing water coverages; however, the total amount of CO2 produced decreases. Although coadsorbed Oa and H2O have a minimal influence on the initial adsorption probability of CO, the total uptake of CO decreases as H2O coverages increase. Interestingly, the adsorption of water induces desorption of predeposited molecularly chemisorbed O2. Thus, adsorbed water slightly inhibits CO oxidation on atomic oxygen precovered Au/TiO2(110) model catalysts under UHV conditions.

AB - The effect of moisture on CO oxidation on Au/TiO2(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 (H218O) takes part in CO oxidation on Oa precovered Au/TiO2(110) model catalysts, leading to the formation of C16O18O and C16O 16O. The amount of C16O18O produced increases with increasing water coverages; however, the total amount of CO2 produced decreases. Although coadsorbed Oa and H2O have a minimal influence on the initial adsorption probability of CO, the total uptake of CO decreases as H2O coverages increase. Interestingly, the adsorption of water induces desorption of predeposited molecularly chemisorbed O2. Thus, adsorbed water slightly inhibits CO oxidation on atomic oxygen precovered Au/TiO2(110) model catalysts under UHV conditions.

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