Abstract
The effect of gold nanoparticles supported on V2O5/TiO2 nanomaterials prepared by different routes and its activity in the CO oxidation at low temperature were studied. The catalysts were characterized by N2 physisorption, X-ray diffraction, Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). This study showed that the sol-gel Au-V2O5/TiO2 material exhibited higher catalytic activity after a thermal treatment at 400 °C in hydrogen than Au-V2O5/NT nanotubes, Au-V2O5/P25 Evonik and V2O5/TiO2 nanomaterials. The sol-gel Au-V2O5/TiO2 catalyst was also more active than Au/TiO2. These results could be explained by the fact that the gold species (Au° and Au1+) improved the interaction between vanadium species and TiO2, allowing high vanadium oxidation states (from V3+ to V5+) through a charge transfer effect between the support surface and Au-VOx reactive species; the presence of monovanadate and Ti3+ species led to remarkable activity in the CO oxidation from 0 °C in comparison with Au/TiO2.
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