Mössbauer Study of the Sulfidation of Hydrodesulfurization Catalysts: So-Called “Co-Mo-S” Phase Observed in Carbon-Supported Co and Co-Mo Sulfide Catalysts

https://doi.org/10.1016/S0167-2991(08)60497-8Get rights and content

Abstract

In-situ Mössbauer Emission Spectroscopy (MES) has been used to study the type of phases present in sulfided activated carbon-supported Co and Co-Mo hydrodesulfurization (HDS) catalysts. Most of the reported MES studies are performed on Co-Mo/Al2O3 catalysts. Co species in the so-called “Co-Mo-S” phase, so far only observed in sulfided catalysts containing Co and Mo, should govern the HDS activity. The present observations show that the same Co species in sulfided Co/C and Co-Mo/C catalysts, with the same quadrupole splitting (QS) as “Co-Mo-S” can be formed. Similar results are obtained for sulfided Fe/C and Fe-Mo/C catalysts. Furthermore, it turns out that the QS-value of the “active phase” in the sulfided Co/C and Co-Mo/C catalysts depends on the sulfiding temperature and Co content. Hence, it seems unlikely that there will be only one well defined active sulfide phase which governs the HDS activity.

References (39)

  • J.C. Duchet et al.

    J. Catal.

    (1983)
  • H. Topsøe et al.

    Appl. Catal.

    (1986)
  • B.M. Reddy et al.

    Appl. Catal.

    (1986)
  • J.P.R. Vissers et al.

    J. Catal.

    (1987)
  • R.J.H. Voorhoeve et al.

    J. Catal.

    (1971)
  • H. Topsøe et al.

    J. Catal.

    (1981)
  • C. Wivel et al.

    J. Catal.

    (1981)
  • V.H.J. de Beer et al.

    J. Catal.

    (1981)
  • W.L.T.M. Ramselaar et al.

    Appl. Catal.

    (1988)
  • H. Topsøe et al.
  • J.L. Schmitt et al.

    U.S. Patent

    (1977)
  • D.G. Gavin et al.

    E.P.

    (1981)
  • C.K. Groot et al.

    Ind. Eng. Chem. Prod. Res. Dev.

    (1986)
  • J.P.R. Vissers et al.

    Bull. Soc. Chim. Belg.

    (1984)
  • J.A.R. van Veen et al.

    J. Chem. Soc., Chem. Commun.

    (1987)
  • B. Scheffer, Thesis, University of Amsterdam, Amsterdam...
  • B.C. Gates et al.
  • B. Delmon
  • A.L. Farragher et al.
  • Cited by (0)

    View full text