The application of inelastic neutron scattering to explore the significance of a magnetic transition in an iron based Fischer-Tropsch catalyst that is active for the hydrogenation of CO

Warringham, R., McFarlane, A. R., MacLaren, D. A. , Webb, P. B., Tooze, R., Taylor, J., Ewings, R., Parker, S. and Lennon, D. (2015) The application of inelastic neutron scattering to explore the significance of a magnetic transition in an iron based Fischer-Tropsch catalyst that is active for the hydrogenation of CO. Journal of Chemical Physics, 143(17), 174703. (doi:10.1063/1.4935054) (PMID:26547178)

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Abstract

An iron based Fischer-Tropsch synthesis catalyst is evaluated using CO hydrogenation at ambient pressure as a test reaction and is characterised by a combination of inelastic neutron scattering (INS), powder X-ray diffraction, temperature-programmed oxidation, Raman scattering and transmission electron microscopy. The INS spectrum of the as-prepared bulk iron oxide pre-catalyst (hematite, α-Fe2O3) is distinguished by a relatively intense band at 810 cm-1, which has previously been tentatively assigned as a magnon (spinon) feature. An analysis of the neutron scattering intensity of this band as a function of momentum transfer unambiguously confirms this assignment. Post-reaction, the spinon feature disappears and the INS spectrum is characterised by the presence of a hydrocarbonaceous overlayer. A role for the application of INS in magnetic characterisation of iron based FTS catalysts is briefly considered.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Lennon, Professor David and McFarlane, Dr Andrew and Warringham, Mr Robbie and MacLaren, Dr Donald
Authors: Warringham, R., McFarlane, A. R., MacLaren, D. A., Webb, P. B., Tooze, R., Taylor, J., Ewings, R., Parker, S., and Lennon, D.
College/School:College of Science and Engineering > School of Chemistry
College of Science and Engineering > School of Physics and Astronomy
Journal Name:Journal of Chemical Physics
Publisher:American Institute of Physics
ISSN:0021-9606
ISSN (Online):1089-769

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