Continuous catalytic process for the selective dehydration of glycerol over Cu-based mixed oxide

[EN] The selective dehydration of glycerol to hydroxyacetone (acetol) was studied with Cu-based mixed oxides derived from hydrotalcite as catalysts in a continuous flow fix-bed reactor. Catalysts were prepared by co-precipitation and characterized by ICP, N-2 adsorption, XRD, NH3-TPD, CO2-TPD, TPR and TEM. Different parameters were investigated to develop the most appropriate material as well as to determine the function of every metallic species. The optimized Cu-Mg-AlOx offered approximate to 60% acetol selectivity at >90% glycerol conversion (approximate to 80% liquid yield, up to TOS = 9 h). The catalyst could be regenerated by calcination, achieving full activity recovery after five re-cycles. "In-situ" FTIR and XPS measurements evidenced that the presence of Cu, specially the most active Cu1+ species, was essential to carry out the dehydration to acetol with high reaction rates, and to form the preferred intermediate (with C=O group); although a minor contribution from Cu-0 and Cu2+ species could not be discarded.Financial support by Spanish Government (CTQ-2015-67592, PGC2018-097277-B-100 and SEV-2016-0683) and PhosAgro/UNESCO/IUPAC Partnership (Proj. 139) is gratefully acknowledged. J.M. also thanks Spanish Government (CTQ-2015-67592) for his FPI fellowship.Mazarío-Santa-Pau, J.; Concepción Heydorn, P.; Ventura, M.; Domine, ME. (2020). Continuous catalytic process for the selective dehydration of glycerol over Cu-based mixed oxide. Journal of Catalysis. 385:160-175. https://doi.org/10.1016/j.jcat.2020.03.010S160175385BP Statistical Review of World Energy, #BPstats. 40 (2015). bp.com/statisticalreview.Stöcker, M. (2008). 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