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


The adsorption and decomposition of ethylene over a Pt{111} single crystalsurface 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.

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Divisions: College of Engineering & Physical Sciences > School of Infrastructure and Sustainable Engineering > Chemical Engineering & Applied Chemistry
College of Engineering & Physical Sciences > Energy and Bioproducts Research Institute (EBRI)
Additional Information: © 2003 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Journal of Vacuum Science & Technology A 21, 563 (2003) and may be found at
Publication ISSN: 0734-2101
Last Modified: 04 Jan 2024 08:44
Date Deposited: 27 Nov 2014 15:35
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Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
http://scitatio ... .1116/1.1559923 (Publisher URL)
PURE Output Type: Article
Published Date: 2003-05
Published Online Date: 2003-03-18
Authors: Lee, Adam F. (ORCID Profile 0000-0002-2153-1391)
Wilson, Karen (ORCID Profile 0000-0003-4873-708X)



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