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

Maarten M. M. Jansen; Jose Gracia; Ben E. Nieuwenhuys; (Hans) J. W. Niemantsverdriet

doi:10.1039/B910497F

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Physical Chemistry Chemical Physics

Issue 43, 2009

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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

Phys. Chem. Chem. Phys., 2009, 11, 10009-10016

DOI: 10.1039/B910497F
Received 28 May 2009, Accepted 20 Aug 2009
First published on the web 08 Sep 2009

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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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Physical Chemistry Chemical Physics

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

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