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Química Nova

Print version ISSN 0100-4042On-line version ISSN 1678-7064

Abstract

RODELLA, Cristiane B. et al. Textural and structural characterization of V2O5/TiO2 catalysts obtained by the sol-gel method: comparison between conventional and supercritical drying. Quím. Nova [online]. 2002, vol.25, n.2, pp.209-213. ISSN 0100-4042.  http://dx.doi.org/10.1590/S0100-40422002000200007.

This work describes a modified sol-gel method for the preparation of V2O5/TiO2 catalysts. The samples have been characterized by N2 adsorption at 77K, x-ray diffractometry (XRD) and Fourier Transform Infrared (FT-IR). The surface area increases with the vanadia loading from 24 m2 g-1, for pure TiO2, to 87 m2 g-1 for 9wt.% of V2O5. The rutile form is predominant for pure TiO2 but became enriched with anatase phase when vanadia loading is increased. No crystalline V2O5 phase was observed in the catalysts diffractograms. Two species of surface vanadium observed by FT-IR spectroscopy a monomeric vanadyl and polymeric vanadates, the vanadyl/vanadate ratio remains practically constant.

Keywords : catalyst; vanadium and titanium oxide; sol-gel.

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