Adsorption of cyclic hydrocarbons on Pt and the interaction of the adsorbed species with hydrogen |
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Authors: | Zoltán Hlavathy Pál Tétényi |
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Institution: | Department of Catalysis and Tracer Studies, Institute of Isotope, CRC, Hungarian Academy of Sciences, H-1525 Budapest, P.O. Box 77, Hungary |
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Abstract: | The adsorption of six-membered hydrocarbon cycles and cyclopentane and the interaction of hydrogen with the adsorbed layer on polycrystalline Pt-foil have been studied. The work function change (Δφ) was followed by a Kelvin probe and the C/Pt peak ratio was determined by Auger electron spectroscopy. Combining these two techniques made it possible to distinguish between chemisorption via σ-bonds and π-complex formation. Benzene and toluene adsorbed first as π-complex while cyclohexane showed initially a partial aromatization and a π-complex-like bonding to the surface. Excess hydrocarbon or addition of hydrogen transformed the π-complex into σ-bonded species. Cyclopentane adsorbed via σ-bonds and showed no significant hydrogen effect. |
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Keywords: | 82 65 &minus i 82 65 Y 82 80 P |
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