Vol. 36 No. 2 (2023): Revista ION
Articles

CoMo supported on calcined (MeFeAl) tertiary hydrotalcites (Me2+: Co2+, Ni2+, Mg2+ or Zn2+) for dibenzothiophene hydrodesulfurization reaction

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  • Edwin Oviedo,
  • Carlos Linares,
  • Sylvette Brunet
Edwin Oviedo
Docente Universitario
DOI: https://doi.org/10.18273/revion.v36n2-2023004

Published 2023-06-30

Keywords

  • hydrotalcite, hydrodesulfurization, dibenzothiophene, cetane number, gas-oil, Diesel.,
  • hydrotalcite,
  • hydrodesulfurization,
  • dibenzothiophene,
  • cetane number,
  • gas-oil,
  • diesel
    • ...More
    Less

How to Cite

Oviedo, E., Linares, C., & Brunet, S. (2023). CoMo supported on calcined (MeFeAl) tertiary hydrotalcites (Me2+: Co2+, Ni2+, Mg2+ or Zn2+) for dibenzothiophene hydrodesulfurization reaction. Revista ION, 36(2), 47–62. https://doi.org/10.18273/revion.v36n2-2023004

Copyright (c) 2023 Edwin Oviedo, Carlos Linares, Sylvette Brunet

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

Abstract

Five tertiary hydrotalcites containing Fe3+ and Al3+ (M3+) as trivalent cations, and Mg2+, Co2+, Ni2+ or Zn2+ (M2+) as divalent cations were synthesized. A [M+3/(M3++M2+)] ratio of 0.22 and a [Fe3+/Al3+] ratio of 0.66 were kept for all synthesis with exception of a MgFeAl hydrotalcite whose [Fe3+/Al3+] ratio was duplicated to 1.32. The mixed oxides from these hydrotalcytes were used as supports of the active phase (Mo) promoting with Co. As-synthesized hydrotalcites, supports and their catalytic precursors were characterized by techniques such as chemical analysis by X-ray fluorescence, surface measurements, X-ray diffraction (XRD), CO2 temperature programmed desorption (CO2-TPD), elemental analysis (S and C) and high-resolution transmission electron microscopy (HRTEM). All catalytic precursors were tested in the reactions of dibenzothiophene hydrodesulfurization, showing the following order of activity: CoMo/γ-Al2O3>CoMo/MgFeAl(0.66)> CoMo/MgFeAl(1.32)> CoMo/CoFeAl> CoMo/NiFeAl> CoMo/ZnFeAl, The catalytic activity and selectivity towards the formation of hydrogenation products over direct desulfurization (HID/DSD) increased as the basicity of the catalyst increased. These results were associated to (fMo) Mo fraction and the nature of supports. It is important to mention that the catalysts: CoMo/MgFeAl(0.66) and CoMo/MgFeAl(1.32) showed the highest selectivity towards the hydrogenation route compared to the reference catalyst (CoMo/γ-Al2O3). Additionally, the activity of the CoMo/MgFeAL(0.66) catalyst towards the HID pathway was the highest, even exceeding the activity of CoMo/γ-Al2O3.

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