Microwave-Assisted Facile Sol–Gel Synthesis of WO<sub>3</sub>-Based Silica Catalysts for Enhanced Activity in Glycerol Dehydration
Yaşar Zengin, Busra Kaya, Mehtap Şafak Boroğlu, İsmail Boz
Abstract
High Resolution Image Download MS PowerPoint Slide WO 3 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 (cSiO 2 ) catalysts were obtained using a novel microwave-assisted synthesis method. The enhancement in the sol–gel grafting of metal oxides onto the cSiO 2 support was achieved by microwave irradiation (MW) and compared to the conventional heating (CH). WO 3 -cSiO 2 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-cSiO 2 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.