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Revista de la Facultad de Ingeniería Universidad Central de Venezuela

versión impresa ISSN 0798-4065

Resumen

PINTO-CASTILLA, Susana; SILVA, Pedro  y  BETANCOURT, Paulino. USE OF ELECTRON PARAMAGNETIC RESONANCE TECHNIQUES IN THE STUDY OF CATALYSTS BASED ON VANADIUM: CATALYTIC HYDROTREATING. Rev. Fac. Ing. UCV [online]. 2012, vol.27, n.4, pp.95-104. ISSN 0798-4065.

Electron Paramagnetic Resonance (EPR) is a sensitive spectroscopic method for the determination of the geometric and electronic structure, the dynamics and the spatial distribution of paramagnetic species in catalytic systems, respecting to the oxidation state, support effects and changes in the surface catalytic after reaction. This technique had been employed in order to study a new synthesis route to prepared vanadium nanoparticles catalyst supported on activated carbon, γ-alumina, silica and titania. The bimetallic systems: NiV/C y VMo/C also we prepared. The catalysts were tested in Hydrotreating reactions (HDS, HYD, and HDN). EPR measurements shows the presence of V4+ species on the oxides supports, it can be found as isolated species or clusters, being depending of the support used. Moreover, the EPR study shows the chemical environment changes around the metallic particles after HDS, HYD and HDN reactions. Not signal related with V4+ species were found when the support was carbon, but an increase in the dangling bonds was find. It was proposed that this paramagnetic species could be related with the catalytic activities in the Hydrotreating reactions studies, decreasing its behavior catalytic

Palabras clave : EPR; Vanadium; Activated Carbon; Oxidic Soports; Hydrotreating Catalyst.

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