Synthesis and characterization of vanadium nitrides and carbides
Two vanadium carbides catalysts (CV-a and CV-A) were prepared using two carburation gas mixture flows (660 and 8 mL/min, respectively) and a vanadium nitride (NV) catalyst was also prepared with a 660 mL/min of NH3 flow. The catalysts were characterized by X-ray diffraction, nitrogen adsorption, n-b...
| Autores: | , , , , , |
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| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2010 |
| País: | México |
| Recursos: | UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO |
| Repositorio: | Revista Internacional de Contaminación Ambiental |
| Idioma: | español |
| OAI Identifier: | oai:ojs.pkp.sfu.ca:article/21630 |
| Acesso em linha: | https://www.revistascca.unam.mx/rica/index.php/rica/article/view/21630 |
| Access Level: | acceso abierto |
| Palavra-chave: | carburo de vanadio nitruro de vanadio deshidratación de 2-propanol HDS de tiofeno HDS de gasóleo pesado de vacío |
| Resumo: | Two vanadium carbides catalysts (CV-a and CV-A) were prepared using two carburation gas mixture flows (660 and 8 mL/min, respectively) and a vanadium nitride (NV) catalyst was also prepared with a 660 mL/min of NH3 flow. The catalysts were characterized by X-ray diffraction, nitrogen adsorption, n-butylamine potentiometric titration techniques and their acid and catalytic properties were tested in 2-propanol dehydration, hydrodesulphurization of thiophene and a heavy gas oil. Heavy gas oil hydrodesulphurization was carried out with the vanadium carbide prepared at 660 mL/min of carburation gas mixture and with the vanadium nitride catalysts. Results obtained in 2-propanol dehydration indicate that both vanadium carbides have acid properties with the prevalence of weak acid sites, while the vanadium nitrides have acid-base properties. In the thiophene hydrodesulphurization, the vanadium carbide prepared with 8 mL/min of CH4/H2 gas mixture was the most active catalysts, this catalyst shows a crystalline phase mixture. In the gas oil hydrodesulphurization the vanadium carbide “CV-a” was more active than the vanadium nitride, with a 40 wt % of sulphur remotion and a 51 wt % of nitrogen remotion. |
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