Combined XRD and XANES studies of a Re-promoted Co/γ-Al2O3 catalyst at Fischer–Tropsch synthesis conditions

Magnus Rønning, Nikolaos E. Tsakoumis, Alexey Voronov, Rune Johnsen, Poul Norby, Wouter van Beek, Øyvind Borg, Erling Rytter, Anders Holmen

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    A cobalt based Fischer–Tropsch catalyst was studied during the initial stages of the reaction at industrially relevant conditions. The catalyst consists of 20wt% cobalt supported on γ-Al2O3 and promoted by 1wt% of rhenium. X-ray diffraction (XRD) in combination with X-ray absorption near edge structure (XANES) were used to reveal information on the particle and crystallite size and the oxidation states of the active component. Conditions giving high selectivity towards light hydrocarbons (methanation, 673K, 10bar and high GHSV) were compared to conditions were higher hydrocarbons are the main products (FT synthesis at 483K, 18bar and low GHSV). The data analysis shows no significant changes in the cobalt crystallites during the first hours of Fischer–Tropsch synthesis. Running the reaction at higher temperatures and predominantly methanation conditions led to significant sintering of the cobalt particles and a further reduction of a partially reduced catalyst could be observed.
    Original languageEnglish
    JournalCatalysis Today
    Volume155
    Issue number3-4
    Pages (from-to)289-295
    ISSN0920-5861
    DOIs
    Publication statusPublished - 2010

    Keywords

    • Batteries and carbon-free energy storage
    • Materials and energy storage

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