Abstract
A statistical study of the particle shape and size of pure V 2O 5 and TiO 2, and samples of coprecipitated V 2O 5TiO 2 catalysts with different V Ti ratios, has been performed. They were also characterized by XRD, EDAX, SEM and XPS. The results showed that pure vanadium pentoxide is compose by large square or needle-shaped particles, while pure titanium dioxide has small and rounded ones. VTiO samples presented an area and shape, depending on the V Ti ratio. These results and the spectroscopical characterization conducted to a particle model of the catalysts. Those VOTi samples with high V Ti ratio would have large V 2O 5 crystals acting as support of a V TiO 2 solid solution. In contrast, those samples with a low V Ti ratio, would have the solid solution supporting vanadium pentoxide crystals.
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