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Effect of Water on Low-Temperature CO Oxidation Over a Au/Al2O3 Model Catalyst

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Abstract

The catalytic oxidation of CO at 300 K over a Au/Al2O3/NiAl(110) surface was studied. No CO2 formed in the absence of water in the CO/O2 reaction gas mixture, whereas CO was oxidized when water was present; the CO oxidation rate increased with increasing water partial pressure \((P_{{{\text{H}}_{2} {\text{O}}}} )\) and with decreasing particle size of Au. The water was shown to promote CO oxidation over the Au/Al2O3/NiAl(110) surface, as has been previously observed for a Au/TiO2(110) surface. We demonstrated that the active sites for and role of water in CO oxidation over Au/Al2O3/NiAl(110) were identical to those over Au/TiO2(110). However, more water was required to increase the CO oxidation rate over Au/Al2O3/NiAl(110), compared to that required over Au/TiO2(110). On the basis of temperature-programmed desorption measurements of adsorbed water on the support surfaces, we concluded that the difference in the dependence of CO oxidation on \(P_{{{\text{H}}_{2} {\text{O}}}}\) between Au/Al2O3/NiAl(110) and Au/TiO2(110) could be attributed to the difference in the affinity for water between the Al2O3/NiAl(110) and TiO2(110) supports.

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Authors and Affiliations

  1. Research Institute for Innovation in Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), 16-1 Onogawa, Tsukuba, Ibaraki, 305-8569, Japan

    I. Nakamura & T. Fujitani

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  1. I. Nakamura
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  2. T. Fujitani
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Correspondence to T. Fujitani.

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Nakamura, I., Fujitani, T. Effect of Water on Low-Temperature CO Oxidation Over a Au/Al2O3 Model Catalyst. Catal Lett 144, 1113–1117 (2014). https://doi.org/10.1007/s10562-014-1261-1

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  • DOI: https://doi.org/10.1007/s10562-014-1261-1

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