An inelastic neutron scattering investigation of the temporal behaviour of the hydrocarbonaceous overlayer of a prototype Fischer-Tropsch to olefins catalyst

Davidson, A. L., Webb, P. B., Parker, S. F. and Lennon, D. (2021) An inelastic neutron scattering investigation of the temporal behaviour of the hydrocarbonaceous overlayer of a prototype Fischer-Tropsch to olefins catalyst. Topics in Catalysis, 64(9-12), pp. 631-637. (doi: 10.1007/s11244-021-01419-y)

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Abstract

A dual sodium and sulfur promoted haematite, representative of a candidate Fischer-Tropsch to olefins (FTO) catalyst, is prepared and contrasted with the performance of an unpromoted hematite sample in the ambient pressure CO hydrogenation reaction at 623 K as a function of time-on-stream (0–24 h). In-situ post-reaction temperature-programmed oxidation measurements show the carbon evolutionary phase of the catalyst conditioning process to be retarded for the FTO catalyst. Ex-situ inelastic neutron scattering measurements show the promoters perturb the formation of a previously described hydrocarbonaceous overlayer. Specifically, whilst the sp3 hybridised C–H modes of the hydrocarbonaceous overlayer are almost unaffected by the additives, the formation of the overlayer’s sp2 hybridised C–H modes are noticeably impeded. The results are discussed in terms of the Na/S promoters disturbing the formation of an ordered hydrocarbonaceous overlayer that is thought to constrain the supply of adsorbed hydrogen atoms, which favours the formation of unsaturated hydrocarbons associated with the FTO process.

Item Type:Articles
Additional Information:Sasol Ltd., the University of Glasgow and the EPSRC [award reference EP/P505534/1.] are thanked for the provision of a postgraduate studentship (ALD). The Royal Society is thanked for the provision of an Industry Fellowship (PBW).
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Davidson, Dr Alisha and Lennon, Professor David
Authors: Davidson, A. L., Webb, P. B., Parker, S. F., and Lennon, D.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Topics in Catalysis
Publisher:Springer
ISSN:1022-5528
ISSN (Online):1572-9028
Published Online:17 March 2021
Copyright Holders:Copyright © 2021 The Authors
First Published:First published in Topics in Catalysis 64(9-12): 631-637
Publisher Policy:Reproduced under a Creative Commons License

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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