A series of V2O5/MgO catalysts containing 1 to 20 wt % V2O5 were prepared and characterized by means of X-ray diffraction, FT-infrared, electron spin resonance, scanning electron microscopy, NH3 and CO2 uptake measurements. Activity and selectivity of the catalysts were evaluated for selective oxidation of 4-methylanisole to p-anisaldehyde. Characterization results suggest that the vanadia when impregnated on magnesia interacts strongly with the support and results in the formation of a magnesium orthovanadate compound instead of two-dimensional over layers on the support surface. The V−Mg−O compound formed exhibits good conversion and product selectivity for the title reaction. Attempts are made to correlate the acid-base characteristics of the catalysts, obtained from NH3 and CO2 uptakes, with their catalytic properties.
Research on Chemical Intermediates – Springer Journals
Published: Apr 15, 2009
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