The critical role of water at the gold-titania interface in catalytic CO oxidation

  title={The critical role of water at the gold-titania interface in catalytic CO oxidation},
  author={Johnny Saavedra and H. A. N. Doan and Christopher J Pursell and Lars C Grabow and Bert D Chandler},
We provide direct evidence of a water-mediated reaction mechanism for room-temperature CO oxidation over Au/TiO2 catalysts. A hydrogen/deuterium kinetic isotope effect of nearly 2 implicates O-H(D) bond breaking in the rate-determining step. Kinetics and in situ infrared spectroscopy experiments showed that the coverage of weakly adsorbed water on TiO2 largely determines catalyst activity by changing the number of active sites. Density functional theory calculations indicated that proton… CONTINUE READING
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