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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

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Author(s)

Robbie Warringham, Andrew R. McFarlane, Donald A. MacLaren, Paul B. Webb, Robert P. Tooze, Jon Taylor, Russell A. Ewings, Stewart F. Parker, David Lennon

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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, alpha-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. (C) 2015 AIP Publishing LLC.

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Original languageEnglish
Article number174703
Number of pages11
JournalJournal of Chemical Physics
Volume143
Issue number17
DOIs
Publication statusPublished - 7 Nov 2015

    Research areas

  • ALUMINA-SUPPORTED NICKEL, CARBONACEOUS MATERIALS, SPECTROSCOPY, METHANE, INVESTIGATE, PERFORMANCE, GRAPHITE, HEMATITE, SIZE

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