Characterisation of hydrocarbonaceous overlayers important in metal-catalysed selective hydrogenation reactions

Lennon, D. , Warringham, R., Guidi, T. and Parker, S. F. (2013) Characterisation of hydrocarbonaceous overlayers important in metal-catalysed selective hydrogenation reactions. Chemical Physics, 427, pp. 49-53. (doi: 10.1016/j.chemphys.2013.04.005)

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The hydrogenation of alkynes to alkenes over supported metal catalysts is an important industrial process and it has been shown that hydrocarbonaceous overlayers are important in controlling selectivity profiles of metal-catalysed hydrogenation reactions. As a model system, we have selected propyne hydrogenation over a commercial Pd(5%)/Al2O3 catalyst. Inelastic neutron scattering studies show that the C–H stretching mode ranges from 2850 to 3063 cm−1, indicating the mostly aliphatic nature of the overlayer and this is supported by the quantification of the carbon and hydrogen on the surface. There is also a population of strongly hydrogen-bonded hydroxyls, their presence would indicate that the overlayer probably contains some oxygen functionality. There is little evidence for any olefinic or aromatic species. This is distinctly different from the hydrogen-poor overlayers that are deposited on Ni/Al2O3 catalysts during methane reforming.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Warringham, Mr Robbie and Lennon, Professor David
Authors: Lennon, D., Warringham, R., Guidi, T., and Parker, S. F.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Chemical Physics
Copyright Holders:Copyright © 2013 Elsevier
First Published:First published in Chemical Physics 427:49-53
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher.

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
442801Towards a molecular understanding of deactivation issues in methane reforming catalystsDavid LennonEngineering & Physical Sciences Research Council (EPSRC)EP/E028861/1CHEM - CHEMISTRY