The role of adsorption heats and bond energies in the assignment of surface reaction products: ethyne and ethene on Ni{110}

Brown, W A, Kose, R and King, D A (1999) The role of adsorption heats and bond energies in the assignment of surface reaction products: ethyne and ethene on Ni{110}. Journal of Molecular Catalysis A: Chemical, 141 (1-3). 21 - 29. ISSN 1381-1169

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Abstract

In order to understand the complex dissociation processes that occur on adsorption of hydrocarbons on surfaces, it is necessary to understand the energetics involved. From investigations of the adsorption of various hydrocarbon species on surfaces, it has been possible to calculate M-C bond energies. These could then be used to calculate the expected adsorption heats for various possible adsorbed species on surfaces for the assignment of adsorbate states from measured heats in conjunction with spectroscopic data. Heats of adsorption and sticking probabilities for C2H2 and C2H4 on Ni{110} at 300 K have been measured. The initial sticking probability and heat of adsorption for C2H2 are 0.8 and 190 kJ mol(-1) respectively, while those for C2H4 are 0.78 and 120 kJ mol(-1). In both cases, CCH species are formed on the surface initially, and for the adsorption of C2H2, CH2 and CH are formed on the surface at higher exposures. Assuming the presence of these species on the surface, a value of the Ni-C bond strength of 191 kJ mol(-1) is found. This is in excellent agreement with the average value of 204 kJ mol(-1) calculated for hydrocarbon adsorption on the Ni{100} surface previously. (C) 1999 Elsevier Science B.V. All rights reserved.

Item Type: Article
Schools and Departments: School of Life Sciences > Chemistry
Subjects: Q Science
Depositing User: Deeptima Massey
Date Deposited: 23 Jul 2014 09:11
Last Modified: 23 Jul 2014 09:11
URI: http://sro.sussex.ac.uk/id/eprint/48662
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