Electron paramagnetic resonance study of electronic changes of vanadium in poisoned hydrodesulfurization catalysts submitted to oxidation, carbiding and nitriding processes
| Autor: | Josmir Rodríguez, Joaquín L Brito, Raquel del Toro, Daniel Figueroa, Delfín Moronta, Susana Pinto-Castilla, Paulino J. Betancourt-Figueroa |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
010405 organic chemistry Inorganic chemistry Vanadium chemistry.chemical_element 010402 general chemistry 01 natural sciences Catalysis 0104 chemical sciences law.invention Metal chemistry law Oxidation state visual_art visual_art.visual_art_medium Molecule Physical and Theoretical Chemistry Electron paramagnetic resonance Hydrodesulfurization Nitriding |
| Zdroj: | Reaction Kinetics, Mechanisms and Catalysis. 128:935-947 |
| ISSN: | 1878-5204 1878-5190 |
| DOI: | 10.1007/s11144-019-01666-x |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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