Abstract
A series of tetrametallic hydrotalcite with different Ni loading, were synthesized by coprecipitation method. Then, these hydrotalcites were calcined in their respective metal oxides and were used as catalysts in the etherification reaction for the synthesis of polyglycerols. The effect of Ni loading on the structural and textural features was investigated by various techniques such as X-ray diffraction (XRD), thermogravimetric analysis TG–DSC–MS, temperature-programmed reduction (H2-TPR), temperature-programmed desorption (NH3-TPD) and 1-butene isomerization as a model reaction to probe acid–base character of catalysts. Mixed oxides derived from hydrotalcites are found to be active and suitable, via solvent free, in the glycerol etherification reaction. A gradual enhance of glycerol conversion is revealed when increasing the Ni/Mg molar ratio and the most active catalyst found is HTc-Ni75% with full selectivity to diglycerol.
Highlights
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The presence of Ni2+ species modifies the amount of acid and basic sites.
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The partial incorporation of Ni2+ enhances the catalytic activity.
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The glycerol etherification leads to diglycerol and triglycerols as products.
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Temperatures higher than 220 °C lead to uncontrolled polymerizations.
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Acknowledgements
This work was supported by the projects RTI2018-099668-B-C22 (Spanish Ministry of Science, Innovation and Universities, Spain and FEDER Funds) and UMA18-FEDERJA, P12-RNM-1565 projects (Junta de Andalucía, Spain). A special acknowledge to the Tunisian Ministry of Higher Education, Scientific Research, Information and Communication Technologies for the financial support.
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Aloui, M., Cecilia, J.A., Moreno-Tost, R. et al. Glycerol etherification towards selective diglycerol over mixed oxides derived from hydrotalcites: effect of Ni loading. J Sol-Gel Sci Technol 97, 351–364 (2021). https://doi.org/10.1007/s10971-020-05344-6
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DOI: https://doi.org/10.1007/s10971-020-05344-6