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Hyperfine Interactions

, Volume 139, Issue 1–4, pp 3–18 | Cite as

The Application of Mössbauer Emission Spectroscopy to Industrial Cobalt Based Fischer–Tropsch Catalysts

  • J. van de Loosdrecht
  • P. J. van Berge
  • M. W. J. Crajé
  • A. M. van der Kraan
Article

Abstract

The application of Mössbauer emission spectroscopy to study cobalt based Fischer–Tropsch catalysts for the gas-to-liquids process was investigated. It was shown that Mössbauer emission spectroscopy could be used to study the oxidation of cobalt as a deactivation mechanism of high loading cobalt based Fischer–Tropsch catalysts. Oxidation was observed under conditions that are in contradiction with the bulk cobalt phase thermodynamics. This can be explained by oxidation of small cobalt crystallites or by surface oxidation. The formation of re-reducible Co3+ species was observed as well as the formation of irreducible Co3+ and Co2+ species that interact strongly with the alumina support. The formation of the different cobalt species depends on the oxidation conditions. Iron was used as a probe nuclide to investigate the cobalt catalyst preparation procedure. A high-pressure Mössbauer emission spectroscopy cell was designed and constructed, which creates the opportunity to study cobalt based Fischer–Tropsch catalysts under realistic synthesis conditions.

Keywords

Cobalt Emission Spectroscopy Synthesis Condition Catalyst Preparation Cobalt Catalyst 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • J. van de Loosdrecht
    • 1
  • P. J. van Berge
    • 1
  • M. W. J. Crajé
    • 2
  • A. M. van der Kraan
    • 2
  1. 1.Sasol Technology (Pty) LtdSasolburgSouth Africa
  2. 2.Interfacultair Reactor InstituutDelft University of TechnologyDelftThe Netherlands

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