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• W2154366929 startingPage "43" @default.
• W2154366929 abstract "Vanadium oxide catalysts supported on activated carbon (V/AC) with V loadings ranging from 1 to 20 wt.% were prepared by a wet-impregnation method. Various physicochemical characterization techniques, including nitrogen physisorption, X-ray diffraction (XRD), Raman spectroscopy, X-ray absorption (XANES and EXAFS), X-ray photoelectron spectroscopy (XPS), and electron spin resonance (ESR), were employed to understand the nature of vanadium species on activated carbon. The results revealed that vanadium oxide mainly existed in a highly dispersed state for 10 wt.% or less vanadium loadings; a large amount of vanadium resulted in aggregated microcrystalline phase. Vanadium species on activated carbon surface showed a similar local coordination structure to that of NH4VO3 with a distorted tetrahedral symmetry at low vanadium loadings, whereas octahedral coordination was dominant at high vanadium loadings (>10 wt.%). All V/AC samples showed V5+ as the major oxidation state. Nevertheless, V4+ centered in a distorted tetrahedral symmetry could be detected at a vanadium loading greater than 4 wt.%. The catalytic activity for the benzyl alcohol oxidation largely depended on the dispersion, oxidation state, and local coordination of vanadium oxides on activated carbon. Highly dispersed vanadium (5+) species with a distorted tetrahedral coordination were postulated to account for the excellent catalytic performances of V/AC catalysts (TOF = 39.1 h−1)." @default.
• W2154366929 created "2016-06-24" @default.
• W2154366929 creator A5006837177 @default.
• W2154366929 creator A5015797870 @default.
• W2154366929 creator A5057979028 @default.
• W2154366929 date "2010-01-02" @default.
• W2154366929 modified "2023-09-23" @default.
• W2154366929 title "Understanding the nature of vanadium species supported on activated carbon and its catalytic properties in the aerobic oxidation of aromatic alcohols" @default.
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• W2154366929 doi "https://doi.org/10.1016/j.molcata.2009.08.028" @default.
• W2154366929 hasPublicationYear "2010" @default.
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