Phosphorus effect on Co//Mo and Ni//Mo synergism in hydrodesulphurization catalysts

M. Villarroel, P. Baeza, F. Gracia, N. Escalona, P. Avila, F. J. Gil-Llambías

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35 Scopus citations


The influence of P concentration on the synergism between Co/γ-Al2O3 or Ni/γ-Al2O3 and Mo/γ-Al2O3 stacked beds separated by a 3-mm stack of Px/γ-Al2O3 is studied in the hydrodesulphurization of gasoil under operating conditions similar to those of industry. The results shown increased Co//Mo and Ni//Mo synergism related to changes in zero point of charge (ZPC), acid strength, and band intensities of diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy due to the incorporation of P into the γ-Al2O3 used as separator.

Original languageEnglish
Pages (from-to)75-79
Number of pages5
JournalApplied Catalysis A: General
Issue number1-2
StatePublished - 31 Jul 2009


  • Hydrodesulphurization
  • Hydrogen spillover
  • Phosphorus
  • Synergism CoMo and NiMo


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