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Electron paramagnetic resonance study of electronic changes of vanadium in poisoned hydrodesulfurization catalysts submitted to oxidation, carbiding and nitriding processes

  • Susana Pinto-Castilla
  • Delfín Moronta
  • Daniel Figueroa
  • Josmir Rodríguez
  • Raquel S. Del ToroEmail author
  • Paulino J. Betancourt-Figueroa
  • Joaquín L. Brito
Article

Abstract

Changes in the oxidation state and chemical environment of vanadium in poisoned and regenerated hydrotreatment (HDT) catalyst were followed by electron paramagnetic resonance (EPR). Oxovanadyltetraphenil porphyrin was used as model poison molecule on synthesized CoMo/Al2O3 HDT-UCV-1 catalyst. Unconventional methodologies of carbiding and nitriding were applied to the deactivated catalyst aiming at recovering its catalytic properties. The results showed that the vanadium incorporation method affected the metallic species on the catalyst surface, particularly the V-support interaction. This work represents an important contribution about the understanding of new phases formed in the spent catalysts after reactivation by means of nitriding and carbiding processes, which are expected to improve the catalytic HDT response.

Keywords

Catalyst regeneration Vanadium EPR Hydrotreating 

Notes

Acknowledgements

To the team of Electronic Paramagnetic Resonance Laboratory of the U.C.V., especially to MSc. Berekyakaleb Errico and Lic. Katiuska Arcia.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.Laboratorio de Fisicoquímica de Superficies, Centro de Química “Dr. Gabriel Chuchani”Instituto Venezolano de Investigaciones CientíficasCaracasVenezuela
  2. 2.Laboratorio de Paramagnetismo, Escuela de Física, Facultad de CienciasUniversidad Central de Venezuela (UCV)CaracasVenezuela
  3. 3.Laboratorio de Tratamiento Catalítico de Efluentes, Facultad de Ciencias, Centro de Catálisis Petróleo y PetroquímicaUniversidad Central de Venezuela (UCV)CaracasVenezuela
  4. 4.School of Chemical Sciences and EngineeringYachay Tech UniversityUrcuquiEcuador

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