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• W2328390727 startingPage "2129" @default.
• W2328390727 abstract "Pd–Au bimetallic catalysts have shown potential applications in numerous heterogeneous reactions in which hydrogen and CO act as reactants, intermediates, or products. A fundamental understanding of the interplay between coadsorbed H and CO on the Pd–Au surface is necessary for improving the understanding of catalytic performance. In this study, the interactions of hydrogen and CO with Pd/Au(111) model surfaces were investigated by temperature-programmed desorption (TPD) and molecular beam scattering (MBS) experiments, carried out under ultra-high-vacuum conditions. Our results reveal that CO adsorbs competitively on the hydrogen-precovered Pd–Au surface, causing surface H adatoms to diffuse away from stronger-binding sites (e.g., Pd(111)-like islands) to weaker-binding sites (e.g., Pd–Au alloy sites and subsurface), as evidenced by a shift of the H2 desorption feature to lower temperatures in TPD measurements. Additionally, evolution of H2 was observed when a CO molecular beam was impinged onto the H-precovered Pd–Au surface, providing direct evidence that CO induces recombinative desorption of H adatoms. The presence of H adatoms on the Pd–Au surface was found to decrease the initial sticking probability of CO during MBS experiments but had little influence on CO desorption during subsequent TPD measurements." @default.
• W2328390727 created "2016-06-24" @default.
• W2328390727 creator A5025773082 @default.
• W2328390727 creator A5072678129 @default.
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• W2328390727 date "2014-01-15" @default.
• W2328390727 modified "2023-09-25" @default.
• W2328390727 title "Interactions of Hydrogen and Carbon Monoxide on Pd–Au Bimetallic Surfaces" @default.
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• W2328390727 doi "https://doi.org/10.1021/jp411299e" @default.
• W2328390727 hasPublicationYear "2014" @default.
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