Óxidos de vanadio y titanio soportados sobre CMK-3 como un nuevo catalizador para la desulfuración oxidativa de DBT.
Date
2016
Journal Title
Journal ISSN
Volume Title
Publisher
Univesidsad Tecnológica Nacional.
Abstract
En el presente trabajo se estudiaron catalizadores de vanadio soportados sobre el carbón mesoporosos CMK 3 con diferentes contenidos de Vanadio (1-7 % p/p) en la desulfurización oxidativa de dibenzotiofeno (DBT)
como modelo de compuestos sulfurados. La actividad catalítica se comparó con catalizadores de Titanio
soportados en CMK-3. Las propiedades estructurales y texturales de los catalizadores se analizaron mediante
estudios de adsorción de N2, XRD, UV-Vis-DRS y TEM. Tanto la dispersión como la actividad catalítica
dependen fuertemente del contenido de vanadio. La muestra que contiene el 7% p/p de Vanadio es el
catalizador con mejor actividad catalítica para la reacción de ODS de DBT utilizando peróxido de hidrógeno
((H2O2) como oxidante y acetonitrilo como solvente. El 100% de la eliminación de DBT se alcanzó a corto
plazo en condiciones suaves. El carbon mesoporoso CMK-3 con una alta área superficial y gran volumen de
poros promueve el anclaje del metal en la red de carbono, lo que permite alcanzar una alta distribución de
sitios activos y nanoclusters más estables. La reutilización del catalizador indica que V-CMK-3 es un
catalizador potencial para los ODS de dibenzotiofeno.
Vanadium supported-CMK-3 catalysts with vanadium loading of 1-7wt% were studied in the oxidative desulfurization (ODS) of dibenzothiophene as a model sulfur compound. The activity was compared with titanium supported-CMK-3. Structural and textural characterization of the catalysts was performed by means of N2 adsorption, XRD, UV–Vis–DRS and TEM. The dispersion and the nature of the vanadium species depend on the V loading, so does the catalyst activity. Vanadium supported-CMK-3 with 7wt.% of vanadium loading was the most active catalyst for ODS of DBT using hydrogen peroxide (H2O2) as oxidant and acetonitrile as solvent. 100% of DBT elimination was attained at short time in mild conditions. Carbon ordered mesoporous CMK-3 with high surface area and high pore volume promotes a very good anchorage of metal in the carbons framework reaching high active sites distribution and more stable nanoclusters. The reusability of the catalyst indicates that V-CMK-3 is a potential catalyst for the ODS of dibenzothiophene.
Vanadium supported-CMK-3 catalysts with vanadium loading of 1-7wt% were studied in the oxidative desulfurization (ODS) of dibenzothiophene as a model sulfur compound. The activity was compared with titanium supported-CMK-3. Structural and textural characterization of the catalysts was performed by means of N2 adsorption, XRD, UV–Vis–DRS and TEM. The dispersion and the nature of the vanadium species depend on the V loading, so does the catalyst activity. Vanadium supported-CMK-3 with 7wt.% of vanadium loading was the most active catalyst for ODS of DBT using hydrogen peroxide (H2O2) as oxidant and acetonitrile as solvent. 100% of DBT elimination was attained at short time in mild conditions. Carbon ordered mesoporous CMK-3 with high surface area and high pore volume promotes a very good anchorage of metal in the carbons framework reaching high active sites distribution and more stable nanoclusters. The reusability of the catalyst indicates that V-CMK-3 is a potential catalyst for the ODS of dibenzothiophene.
Description
Keywords
CMK-3, Catalizadores de vanadio, Anatase, Desactivación
Citation
XXV Congreso Iberoamericano de Catálisis 2016.
Endorsement
Review
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