Electron paramagnetic resonance study of electronic changes of vanadium in poisoned hydrodesulfurization catalysts submitted to oxidation, carbiding and nitriding processes
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.
Año de publicación:
2019
Keywords:
- hydrotreating
- Catalyst regeneration
- EPR
- Vanadium
Fuente:


Tipo de documento:
Article
Estado:
Acceso restringido
Áreas de conocimiento:
- Catálisis
- Catálisis
- Ciencia de materiales
Áreas temáticas:
- Química inorgánica
- Física aplicada