Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 11, Issue 43, Pages 10009-10016Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b910497f
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Co-adsorption of CO and H-2 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 root 2 x root 2)R45 degrees 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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