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- W2091140014 abstract "The catalytic activity of gold-based catalysts for CO oxidation is influenced by gold particle size, dispersion, and redox properties of the support. The nature of the active site (gold oxidation state) and its modification along the course of the reaction are under discussion. In this work, we studied the modifications of a Au/CeO2 catalyst in the presence of gas-phase CO by simultaneous in situ diffuse reflectance infrared Fourier transform mass spectrometry (DRIFT-MS) in isothermal conditions. Redox processes involving surface hydroxyl groups, gold atoms, and gas-phase CO molecules play a determinant role in surface gold dynamics. The interaction of CO with the catalyst surface results in the evolution of CO2 and H2 through both the decomposition of the formate species and the formation of the [Au(CO)2]+ species, which accounts for the redispersion of gold atoms. The identification of the involved surface species by DRIFT lets us state that a deep reduction of the surface (oxygen vacancy creation) chan..." @default.
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- W2091140014 date "2007-09-01" @default.
- W2091140014 modified "2023-10-10" @default.
- W2091140014 title "Surface Dynamics of Au/CeO<sub>2</sub> Catalysts during CO Oxidation" @default.
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- W2091140014 doi "https://doi.org/10.1021/jp073541k" @default.
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