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

Adam F. Lee, Karen Wilson

Research output: Contribution to journalArticle

Abstract

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.
Original languageEnglish
Pages (from-to)563-568
Number of pages6
JournalJournal of Vacuum Science and Technology Part A
Volume21
Issue number3
Early online date18 Mar 2003
DOIs
Publication statusPublished - May 2003

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x ray spectroscopy
Spectroscopy
saturation
Adsorption
X rays
adsorption
Dehydrogenation
dehydrogenation
Binding energy
thermal decomposition
Ethylene
Pyrolysis
ethylene
binding energy
Chemical activation
Display devices
activation
Decomposition
decomposition
Kinetics

Bibliographical note

© 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 https://doi.org/10.1116/1.1559923

Cite this

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title = "Fast x-ray spectroscopy study of ethene on clean and SO4 precovered Pt{111}",
abstract = "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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Fast x-ray spectroscopy study of ethene on clean and SO4 precovered Pt{111}. / Lee, Adam F.; Wilson, Karen.

In: Journal of Vacuum Science and Technology Part A, Vol. 21, No. 3, 05.2003, p. 563-568.

Research output: Contribution to journalArticle

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T1 - Fast x-ray spectroscopy study of ethene on clean and SO4 precovered Pt{111}

AU - Lee, Adam F.

AU - Wilson, Karen

N1 - © 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 https://doi.org/10.1116/1.1559923

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AB - 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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