Interactions between co-adsorbed CO and H on a Rh(100) single crystal surface

M.M.M. Jansen, J. Gracia, B.E. Nieuwenhuys, J.W. Niemantsverdriet

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    Abstract

    Co-adsorption of CO and H2 on a Rh(100) single crystal surface has been studied by a combination of temperature programmed desorption (TPD), reflection absorption infrared spectroscopy (RAIRS), low energy electron diffraction (LEED), and density functional theory (DFT) calculations. Exposure of CO to a hydrogen precovered surfaces at 150 K results in some displacement of adsorbed hydrogen and a layer with 0.67 ML H and 0.67 ML CO is obtained. A c(32 ×2)R45° structure is formed with CO occupying bridge sites and hydrogen occupying partly bridge sites on the surface and partly octahedral subsurface sites, causing hydrogen to desorb at temperatures around 230 K.
    Original languageEnglish
    Pages (from-to)10009-10016
    JournalPhysical Chemistry Chemical Physics
    Volume2009
    Issue number11
    DOIs
    Publication statusPublished - 2009

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