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• W2102299070 abstract "The influence of V2O5 loading (2–50 wt.%) on surface structures and the reduction pattern of V2O5/SiO2 (VPS) catalysts has been systematically investigated by diffuse reflectance UV–VIS spectroscopy and temperature-programmed reduction (TPR) measurements in the temperature range 200–1100°C. Both TPR and UV–VIS spectra of VPS catalysts indicate that at loadings lower than 10% vanadia forms isolated surface VO43- species, while two-dimensional structures and V2O5 crystallites become the prevailing species in highly loaded (>10% V2O5) systems. A mathematical modelling approach to the TPR spectra has allowed the influence of the loading on the concentration of the above surface V5+ species to be highlighted. The easier reduction of isolated VO43- species has been ascribed to the tetrahedral coordination geometry (Td) of the V ions therein. By contrast, less reducible V2O5 crystallites, with V ions in an octahedral coordination (Oh), give rise to several reduction peaks in the range 600–1000°C which monitor a step-wise reduction pattern. The chemisorption properties of VPS catalysts and bulk V2O5 have been comparatively probed by high- (HTOC) and low-temperature oxygen chemisorption (LTOC) measurements. The effect of loading on the dispersion of V2O5/SiO2 catalysts has been thoroughly addressed." @default.
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• W2102299070 date "1997-01-01" @default.
• W2102299070 modified "2023-09-27" @default.
• W2102299070 title "Surface structures, reduction pattern and oxygen chemisorption of V2O5/SiO2catalysts" @default.
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• W2102299070 doi "https://doi.org/10.1039/a702537h" @default.
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