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KMID : 1059519930370121019
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Journal of the Korean Chemical Society
1993 Volume.37 No. 12 p.1019 ~ p.1024
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Coadsorptions of Carbon Monoxide and Oxygen on Polycrystalline Nickel Surface
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Lee Soon-Bo
Boo Jin-Hyo
Kim Woo-Sub
Ahn Woon-Sun
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Abstract
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The coadsorption of carbon monoxide and oxygen on polycrystalline nickel surface has been studied using XPS at the room temperaure. The adsorption of CO on the nickel surface precovered partially with oxygen is found to take place by the following steps: The CO molecules react with the preadsorbed oxygen atoms to liberate CO2 gas at the initial stage of low CO exposures, and they are coadsorbed gradually with the increasing CO exposures. The extent of coadsorption at the higher CO exposures is found to decrease with the increasing degree of oxygen preadsorption. This finding is explained in terms of the reduced adsorption site for CO as a consequence of oxygen preadsorption. The CO molecules preadsorbed on the nickel surface inhibited the adsorption of O2 molecules. The increase of oxygen exposure led to the dissociation of preadsorbed CO, and the NiO layers were formed concurrently. The dissociation was rendered to arise from an oxygen-to-CO energy transfer.
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