Abstract
Tantalum exchanged tungstophosphoric acid (TaxTPA) catalysts were prepared and studied for the synthesis of glycerol carbonate from glycerol and urea. These catalysts were characterized by FT-IR, X-ray diffraction, Laser Raman, pyridine adsorbed FT-IR and temperature programmed desorption of ammonia. The characterization results indicate that the Keggin ion structure of tungstophosphoric acid (TPA) is intact. The activity towards the synthesis of GC over the TaxTPA catalysts depended on the number of Ta5+ ions exchanged in the secondary structure of heteropoly tungstate. Presence of Ta in TPA leads to the generation of Lewis acidic sites. Catalysts with partially exchanged Ta with the protons of TPA showed high activity due to the presence of both Brønsted and Lewis acidic sites. Different reaction parameters such as reaction temperature, glycerol to urea molar ratio and catalyst loading were studied and optimum conditions were established. These catalysts exhibited reusability.
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Acknowledgments
M. Sharath Babu thanks Department of Chemistry, Osmania University. The authors thank Council of Scientific and Industrial Research (CSIR), New Delhi for the financial support in the form of Indus Magic (CSC-0123) project under 12th Five Year Programme.
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Sharath Babu, M., Srivani, A., Parameswaram, G. et al. Understanding the Role of Tantalum in Heteropoly Tungstate Catalysts for the Synthesis of Glycerol Carbonate from Glycerol and Urea. Catal Lett 145, 1784–1791 (2015). https://doi.org/10.1007/s10562-015-1582-8
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DOI: https://doi.org/10.1007/s10562-015-1582-8