A combined in situ XAS-XRPD-Raman study of Fischer-Tropsch synthesis over a carbon supported Co catalyst

Publication: Research - peer-reviewJournal article – Annual report year: 2012

  • Author: Tsakoumis, Nikolaos E.

    Norwegian University of Science and Technology, Norway

  • Author: Dehghan, Roya

    Norwegian University of Science and Technology, Norway

  • Author: Johnsen, Rune

    Atomic scale modelling and materials, Department of Energy Conversion and Storage, Technical University of Denmark, Frederiksborgvej 399, 4000, Roskilde, Denmark

  • Author: Voronov, Alexey

    Norwegian University of Science and Technology, Norway

  • Author: van Beek, Wouter

    European Synchrotron Radiation Facility, France

  • Author: Walmsley, John C.

    SINTEF Energy Research

  • Author: Borg, Øyvind

    Statoil R&D, Trondheim, Norway

  • Author: Rytter, Erling

    Norwegian University of Science and Technology, Norway

  • Author: Chen, De

    Norwegian University of Science and Technology, Norway

  • Author: Rønning, Magnus

    Norwegian University of Science and Technology, Norway

  • Author: Holmen, Anders

    Norwegian University of Science and Technology, Norway

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A cobalt based Fischer-Tropsch synthesis (FTS) catalyst, supported on a carbon nanofibers/carbon felt composite (Co/CNF/CF) was studied in situ at realistic conditions. The catalyst was monitored by Xray absorption spectroscopy (XAS), high-resolution X-ray powder diffraction (HR-XRPD) and Raman spectroscopy, while changes in the gas phase were observed by mass spectrometry (MS). Transmission electron microscopy (TEM) was also applied to characterise the catalyst. The catalyst has a bimodal particle size distribution and exhibits a high deactivation rate. During the in situ study the catalyst appears to reduce further at the induction period of FTS, while crystallite growth is been detected in the same period. At steady state FTS the amount of metallic Co is constant. A change in the volumetric flow towards higher conversions did not affect the degree of reduction or the crystallite size of the catalyst. Post-treatment at 400 degrees C under H-2 atmosphere leads to sintering of the cobalt particles, while a CO treatment followed by H-2 treatment creates a catalyst rich in hexagonal close packed cobalt through the formation of a Co2C intermediate. (C) 2012 Elsevier B.V. All rights reserved.
Original languageEnglish
JournalCatalysis Today
Publication date2013
Volume205
Pages86-93
ISSN0920-5861
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 9

Keywords

  • Fischer–Tropsch synthesis, Cobalt, In situ, XRPD, XAS, Raman, TEM, Operando, CNF
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