Following the changes in local geometry associated with a surface reaction: the dehydrogenation of adsorbed ethylene
- 7 February 1994
- journal article
- Published by IOP Publishing in Journal of Physics: Condensed Matter
- Vol. 6 (6) , L93-L98
- https://doi.org/10.1088/0953-8984/6/6/011
Abstract
Using scanned-energy-mode photoelectron diffraction we have determined the local adsorption geometry of the reactant and product molecules in a model heterogeneous reaction on a Ni(111) surface in which ethylene (C2H4) is dehydrogenated to acetylene (C2H2). Although the C-C axis remains essentially parallel to the surface, a change in adsorption site occurs, indicating that for the case of a concerted reaction mechanism only two distinct pathways are possible. Precise structural information on a model system of this kind has hitherto been unavailable.Keywords
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