The characterisation of hydrogen on nickel and cobalt catalysts

Davidson, A. L., Lennon, D. , Webb, P. B., Albers, P. W., Berweiler, M., Poss, R., Roos, M., Reinsdorf, A., Wolf, D. and Parker, S. F. (2021) The characterisation of hydrogen on nickel and cobalt catalysts. Topics in Catalysis, 64(9-12), pp. 644-659. (doi: 10.1007/s11244-021-01425-0)

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We have investigated a series of supported and unsupported nickel and cobalt catalysts, principally using neutron vibrational spectroscopy (inelastic neutron scattering, INS). For an alumina supported Ni catalyst we are able to detect hydrogen on the metal for the first time, all previous work has used Raney Ni. For an unsupported Ni foam catalyst, which has similar behaviour to Raney Ni but with a much lower density, the spectra show that there are approximately equal numbers of (100) and (111) sites, in contrast to Raney Ni that shows largely (111) sites. The observation of hydrogen on cobalt catalysts proved to be extremely challenging. In order to generate a cobalt metal surface, reduction in hydrogen at 250–300 °C is required. Lower temperatures result in a largely hydroxylated surface. The spectra show that on Raney Co (and probably also on a Co foam catalyst), hydrogen occupies a threefold hollow site, similar to that found on Co(101¯0). The reduced surface is highly reactive: transfers between cells in a high quality glovebox were sufficient to re-hydroxylate the surface.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Parker, Dr Stewart and Davidson, Dr Alisha and Lennon, Professor David
Authors: Davidson, A. L., Lennon, D., Webb, P. B., Albers, P. W., Berweiler, M., Poss, R., Roos, M., Reinsdorf, A., Wolf, D., and Parker, S. F.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Topics in Catalysis
ISSN (Online):1572-9028
Published Online:19 May 2021
Copyright Holders:Copyright © 2021 The Authors
First Published:First published in Topics in Catalysis 64(9-12): 644-659
Publisher Policy:Reproduced under a Creative Commons Licence

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
190262EPSRC Doctoral Training Grant 2010-14Mary Beth KneafseyEngineering and Physical Sciences Research Council (EPSRC)EP/P505534/1Research and Innovation Services