A photoelectron spectroscopic study of the adsorption of CO and CO2 on platinum |
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| Authors: | PR Norton PJ Richards |
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| Institution: | Physical Chemistry Branch, Chalk River Nuclear Laboratories, Atomic Energy of Canada Limited, Chalk River, Ontario, Canada |
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| Abstract: | The adsorption of CO and CO2 on platinum has been studied by UV photoelectron spectroscopy using both He I and He II radiation. The modulation of the intensity of the spectral features observed for adsorbed CO as the photon energy is changed is used to assign the observed levels. The results are in reasonable agreement with recent theoretical and experimental work. The levels are observed to shift by different amounts compared to gas phase CO because of chemical binding effects. The adsorption of CO2 produces spectral features that are shifted by the same amount compared to gas phase CO2. This, together with the absence of any localized attenuation of the platinum valence band and the low heat of adsorption, indicates that CO2 is physisorbed on platinum. |
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