Abstract
Abstract WO 3 /ZrO 2 catalysts doped with SiO 2 were shown to be more selective and stable catalysts than without SiO 2 for dehydration of glycerol to acrolein at 300 °C. The catalysts prepared combining incorporation of siliceous species into ZrO x (OH) 4-2x precursor and anionic exchange with peroxotungstate exhibited a selectivity to acrolein reaching 78% at nearly total glycerol conversion and a conversion of 82% was maintained after 177 h on stream. Characterization by several techniques (adsorption isotherms, XRD, Raman spectroscopy, XPS, NH 3 -TPD measurements) allowed to understand the origin of the improvement: the deposition of SiO 2 on ZrO 2 favored the formation of larger mesoporous pores and reduces the support basicity limiting the formation of by-products that can be coke precursors.
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