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Behaviour of the resonant absorption area of a57Fe-doped Ni/C catalyst during sulfidation

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Abstract

In-situ Mössbauer spectroscopy measurements down to 4.2 K were performed on a57Fe:Ni(0.5)/C catalyst after various successive sulfidation treatments. After exposure of the catalysts to the H2S/H2 gas mixture at room temperature, part of the57Fe becomes sulfidic. The rest is present as a sulfate-like intermediate species. The interaction between this intermediate species and the carbon support material is influenced by water. At temperatures below 180 K the water is rigid, at higher temperatures the water becomes mobile. This weakens the interaction with the support material, resulting in a decrease of the RAA. The interaction between the sulfidic species and the support material is not influenced by water. However, this species is not yet very well ordered; therefore, the57Fe is loosely bound. The ordering becomes better by sulfidation at higher temperatures, leading to an increase of the RAA.

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Authors and Affiliations

  1. Interfacultair Reactor Instituut, Delft University of Technology, Mekelweg 15, 2629, JB Delft, The Netherlands

    M. W. J. Crajé, W. F. Volmer & A. M. van der Kraan

  2. Schuit Institute of Catalysis, Eindhoven University of Technology, P.O. Box 513, 5600, MB Eindhoven, The Netherlands

    V. H. J. de Beer

Authors
  1. M. W. J. Crajé
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  2. W. F. Volmer
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  3. V. H. J. de Beer
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  4. A. M. van der Kraan
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Crajé, M.W.J., Volmer, W.F., de Beer, V.H.J. et al. Behaviour of the resonant absorption area of a57Fe-doped Ni/C catalyst during sulfidation. Hyperfine Interact 93, 1771–1775 (1994). https://doi.org/10.1007/BF02072944

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