Activated carbon supported cobalt-molybdenum carbides: effect of the synthesis method, heating rate, type of cobalt precursor and presulfiding agent on thiophene hydrodesulfurization


  • Esneyder Puello-Polo Atlantic University
  • Mónica V. Ayala Atlantic University
  • Joaquín L. Brito Venezuelan Institute of Scientific Research



Co-Mo carbides, activated carbon, presulfiding agent, synthesis methods, heating rate, Co precursor type, hydrodesulfurization


This  work  studied  the  Effect  of  the  presulfiding  agent,  type  of  precursor (sulfate   vs.   nitrate   of   promotor),   synthesis   method   (conventional   vs.   carbothermal  carbiding)  and  heating  rate  in  the  hydrodesulfurization  of thiophene  over  activated  carbon  supported  cobalt-molybdenum  carbides.  The synthesis was carried out using the methods conventional (CH4/H2 (1:4)) and carbothermal with H2 at 973 K and 1 or 5 K/min. The carbided phases were characterized by surface area (B.E.T), X-ray Diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The surface areas were within a rank of 266 and 493m2/g, whereas the XRD analysis verified the presence of Co6Mo6C2  for  carbides  obtained  by  carbothermal  method  independently  of  these variables. The XPS showed the presence on the surface of: Moδ+, Mo4+and Mo6+, and Co2+ whose abundance was influenced by the synthesis method and  type  of  precursor.  On  the  order  hand,  XPS  revealed  that  the  carbides  obtained by sulfate precursor retained sulfur on the surface as S2- and SO42-. Tests of thiophene HDS showed that carbides obtained by the carbothermal method had higher activity than those obtained by the conventional method when it was activated with CS2/H2 and inversely when used H2S/H2.

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Author Biographies

Esneyder Puello-Polo, Atlantic University

Catalysis and Materials Group, Faculty of Basic Sciences.

Mónica V. Ayala, Atlantic University

Catalysis and Materials Group, Faculty of Basic Sciences.

Joaquín L. Brito, Venezuelan Institute of Scientific Research

Surface Physicochemistry Laboratory, Chemistry Center.


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How to Cite

Puello-Polo, E., Ayala, M. V., & Brito, J. L. (2014). Activated carbon supported cobalt-molybdenum carbides: effect of the synthesis method, heating rate, type of cobalt precursor and presulfiding agent on thiophene hydrodesulfurization. Revista Facultad De Ingeniería Universidad De Antioquia, (70), 75–85.

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