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The effect of hydration on the molecular structure of silica-supported vanadium oxide catalysts with loadings of 1–16wt.% V has been systematically investigated by infrared, Raman, UV–vis and EXAFS spectroscopy. IR and Raman spectra recorded during hydration revealed the formation of V–OH groups, characterized by a band at 3660cm −1 . Hydroxylation was found to start instantaneously upon exposure...
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