Vibrational Analysis of an Industrial Fe-Based Fischer-Tropsch Catalyst Employing Inelastic Neutron Scattering

AbstractA 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.

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Vibrational Analysis of the Inelastic Neutron Scattering Spectrum of the Pyreviidine Molecule

Spectroscopy of Biological Molecules: Modern Trends ◽

10.1007/978-94-011-5622-6_253 ◽

1997 ◽

pp. 557-558

Author(s):

J. J. López González ◽

M. Fernández Gómez ◽

A. Navarro ◽

G. Kearley ◽

J. Tomkinson

Keyword(s):

Neutron Scattering ◽

Inelastic Neutron Scattering ◽

Vibrational Analysis ◽

Inelastic Neutron ◽

Scattering Spectrum

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The molecular force field of 4-fluorostyrene: an insight into its vibrational analysis using inelastic neutron scattering, optical spectroscopies (IR/Raman) and theoretical calculationsElectronic supplementary information (ESI) available: Structural parameters, frequences and force constants of 4-fluorostyrene (4 tables); observed and calculated IR spectra and INS spectra (6 figures). See http://www.rsc.org/suppdata/cp/b2/b212620f/

Physical Chemistry Chemical Physics ◽

10.1039/b212620f ◽

2003 ◽

Vol 5 (9) ◽

pp. 1760-1768 ◽

Cited By ~ 4

Author(s):

J. M. Granadino-Roldán ◽

M. Fernández-Gómez ◽

A. Navarro ◽

U. A. Jayasooriya

Keyword(s):

Ir Spectra ◽

Force Field ◽

Neutron Scattering ◽

Inelastic Neutron Scattering ◽

Structural Parameters ◽

Vibrational Analysis ◽

Inelastic Neutron ◽

Supplementary Information ◽

Molecular Force ◽

Insight Into

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Examining the temporal behavior of the hydrocarbonaceous overlayer on an iron based Fischer–Tropsch catalyst

RSC Advances ◽

10.1039/c8ra09731c ◽

2019 ◽

Vol 9 (5) ◽

pp. 2608-2617 ◽

Cited By ~ 8

Author(s):

Robbie Warringham ◽

Alisha L. Davidson ◽

Paul B. Webb ◽

Robert P. Tooze ◽

Russel A. Ewings ◽

...

Keyword(s):

Neutron Scattering ◽

Co Hydrogenation ◽

Inelastic Neutron Scattering ◽

Ambient Pressure ◽

Inelastic Neutron ◽

Tropsch Synthesis ◽

Temporal Behavior ◽

Fischer Tropsch ◽

Fischer Tropsch Synthesis ◽

Iron Based

Inelastic neutron scattering is used to examine an un-promoted iron based Fischer–Tropsch synthesis catalyst exposed to ambient pressure CO hydrogenation at 623 K for defined periods of time-on-stream (3, 6, 12 and 24 h).

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