Keggin-type heteropolyacids supported on sol–gel oxides as catalysts for the dehydration of glycerol to acrolein
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Glycerol dehydration to acrolein was performed at temperatures of 220–300 °C over Keggin-type heteropolyacids (H4SiW12O40·xH2O and H4PVMo11O40·xH2O), supported on sol–gel prepared alumina, titania, zirconia and three-mixed oxide AlTiZr. The supports and catalysts were characterized by nitrogen adsorption, XRD, IR—pyridine adsorption and EPR spectroscopy. Tungsten based heteropolyacids showed outstanding performance and stability. Acrolein was always the predominant product with a maximum selectivity of 75% at complete conversion over silicotungstic acid supported over zirconia and titania. Textural properties of samples affected their catalytic performance during the test reaction.
KeywordsHeteropolyacids Effect of supports Catalysts Dehydration Glycerol Acrolein
This work was made with the financial support of the Bulgarian Ministry of Education, Fund “SCIENTIFIC RESEARCH” (Project № POSTDOC_09_0002/2010). E. K is indebted to the M.E. for a postdoctoral grant in Leibniz-Institut für Katalyse e.V (LIKAT Rostock), Germany.
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Conflict of interest
The authors declare that they have no conflict of interest.