WO3 is
a promising catalyst for the production
of acrolein
from glycerol due to its high activity and selectivity. In this study,
various metal oxides (W, Zr, and Nb) over colloidal silica (cSiO2) catalysts were obtained using a novel microwave-assisted
synthesis method. The enhancement in the sol–gel grafting of
metal oxides onto the cSiO2 support was achieved by microwave
irradiation (MW) and compared to the conventional heating (CH). WO3-cSiO2 catalysts synthesized by microwave-assisted
facile sol–gel synthesis were tested in the gas-phase glycerol
dehydration reaction. The best catalytic performance (52.4% acrolein
yield) was obtained over a 25%W-cSiO2 sample prepared by
the MW method. The best yield results were obtained with a B/(B + L) ratio over 0.50
and with an optimum medium-strength acidity. The activity loss was
correlated with the high-strength surface acidity.
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