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Paper
Phys. Chem. Chem. Phys., 2009, 11, 10009 - 10016, DOI: 10.1039/b910497f
Interactions between co-adsorbed CO and H on a Rh(100) single crystal surface
Maarten M. M. Jansen, Jose Gracia, Ben E. Nieuwenhuys and (Hans) J. W. Niemantsverdriet
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(3
2 ×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.
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