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oai:gredos.usal.es:10366/1631212025-04-30T19:50:48Zcom_10366_4164com_10366_4055com_10366_3946com_10366_3823col_10366_4165

Jiménez Morales, Ignacio Moreno-Recio, M. Santamaría-González, J. Maireles-Torres, P. Jiménez-López, A. 2014 [EN]Mesoporous tantalum oxide was prepared by acid hydrolysis of tantalum penta-ethoxide in the presence of a triblock co-polymer Pluronic L-121, a non-ionic surfactant, at room temperature and subsequent calcination at 550 °C for 6 h. This solid exhibits a suitable specific surface area (79 m2 g−1) and a high acidity (353 μmol NH3 g−1) with the presence of both Brönsted and Lewis acid sites, demonstrating to be active as solid acid catalyst in the dehydration of glucose to 5-hydroxymethylfurfural (HMF), in a biphasic water/methyl-iso-butyl ketone (MIBK) system. Thus, by using a glucose:catalyst weight ratio of 3:1, a glucose conversion of 69% and a HMF yield of 23% were achieved at 175 °C, and after only 90 min of reaction time. The catalytic process is selective toward HMF, which is preserved from ulterior hydration to levulinic acid. Fructose was also detected as by-product of glucose isomerisation with 14% of selectivity. The catalyst is very stable, since no leaching of tantalum species to the liquid phase was found; moreover, the catalytic performance of this acid solid is well recovered after calcination at 550 °C for 2 h. http://hdl.handle.net/10366/163121 eng Elsevier 2210.28 Química del Estado Sólido 2303 Química Inorgánica 2391 Química Ambiental Mesoporous tantalum oxide as catalyst for dehydration of glucose to 5-hydroxymethylfurfural info:eu-repo/semantics/article TEXT Gredos. Repositorio Documental de la Universidad de Salamanca Hispana