Abstract
The coadsorption of CO and H 2 on the (111) and (110) faces of indium has been investigated at temperatures of 170–400 K. It is established by HREELS that the CO molecule is terminally bonded to both surfaces within the whole range of coverages. The non-reactive character of coadsorption of the two gases is confirmed. The adsorption of CO on a surface with pre-adsorbed hydrogen leads to displacement of the hydrogen, the surface being completely poisoned with respect to hydrogen adsorption when the CO coverage reaches saturation. The mechanisms of hydrogen displacement by CO are discussed with a view to the adsorption sites occupied by the adsorbates on the two surfaces under consideration.
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