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Fast x-ray spectroscopy study of ethene on clean and SO4 precovered Pt{111}

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2 Author(s)
Lee, Adam F. ; Department of Chemistry, University of Hull, Hull HU6 7RX, United Kingdom ; Wilson, K.

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The adsorption and decomposition of ethylene over a Pt{111} single crystal surface has been investigated by fast x-ray spectroscopy. At 100 K ethene displays precursor-mediated adsorption kinetics, adopting a single environment with a saturation C2H4 coverage of 0.25 ML and binding energy of 283.2 eV. Thermal decomposition proceeds above 240 K via dehydrogenation to ethylidyne with an activation barrier of 57±3 kJ mol-1 and preexponential factor ν=1×1010±0.5 s-1. Site-blocking by preadsorbed SO4 reduces the saturation ethene coverage but induces a new, less reactive π-bonded ethene species centered around 283.9 eV, which in turn decomposes to ethylidyne at 350 K. © 2003 American Vacuum Society.

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Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films  (Volume:21 ,  Issue: 3 )