Chemisorption of HCl and H 2S by Cu(111)-O surfaces

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An XPS study of the chemisorption of HCl and H 2S by Cu(111)-O surfaces at low temperature is shown to involve hydrogen abstraction with the formation of surface hydroxyl species. The subsequent dehydroxylation and desorption of water is followed in the temperature range 80–290 K. All the chemisorbed oxygen is removed and replaced by Cl(a) and S(a) with negligible activation energy. The possible role of strong hydrogen-bonding in the chemisorption-surface replacement reaction is considered.