
handle: 10261/187472
[ES] El 5‐hidroximetil‐2‐furfural (HMF) es considerado una importante plataforma química entre los diversos intermediarios derivados de la biomasa. En este estudio, se utilizó el catalizador (H3O)SbTeO6, con estructura de pirocloro, obtenido por intercambio iónico de KSbTeO6, para la deshidratación de fructosa en HMF. La estructura del compuesto final, incluida la localización de las unidades de H3O+ en el interior de la red tridimensional, se determinó mediante XRD y difracción neutrones de muestras en polvo. La muestra exhibió una excelente cristalinidad, como lo evidencia la anchura de picos de las reflexiones de XRD. El patrón de XRD se indexó con una celda cúbica con a = 10.1510 Å, característico de una estructura de pirocloro. Las medidas catalíticas se realizaron en un reactor de vidrio de 15 mL, provisto de un tapón de rosca de Teflon. En un experimento típico, 0.050 g de catalizador y una solución de fructosa en dimetilsulfóxido (DMSO) como disolvente se introdujeron en el reactor. Se estudió el efecto de factores tales como tiempo de reacción y temperatura sobre la formación de HMF. Se alcanzó un rendimiento a HMF del 72 % y una selectividad de 73 % a 20 min de tiempo de reacción y temperatura de 120 °C.
[EN] 5‐Hydroxymethyl‐2‐furfural (HMF) is considered an important chemical platform among other intermediates derived from biomass. In this study, we have used (H3O)SbTeO6 pyrochlore, obtained by ionic ex‐change from KSbTeO6 as a catalyst for the dehydration of fructose into HMF in dimethyl sulfoxide. The full characterization of the structure of the (H3O)SbTeO6 pyrochlore, including the location of the H3O+ units within the three‐dimensional framework, was carried out by XRD and neutron powder diffraction. The sample exhibited excellent crystallinity, as evidenced by the width of peaks of the XRD reflections. The XRD pattern was indexed with a cubic cell with a = 10.1510 Å, characteristic of a pyrochlore. The reaction was carried out in a glass reactor of 15 mL, provided with a screw top of Teflon, by using 50 mg of (H3O)SbTeO6 catalyst and a solution of fructose in DMSO as solvent. The effect of various factors such as reaction time and temperature on the formation of HMF was investigated. A HMF yield of 72 % and a selectivity of 73 % were obtained at 20 min reaction time and reaction temperature of 120 °C.
Se agradece a CONICET Argentina, PIP CONICET 11220120100218CO (2013‐2015), MINCyT. Cba. 1210/07 (2007‐2015), UTN, y a la XXV Congreso Iberoamericano de Catálisis 7 Comunidad de Madrid (España) proyecto S2013/MAE‐2882, por el apoyo económico.
Poster presented at the XXV Congreso Iberoamericano de Catálisis, held in Montevideo (Uruguay) on September 18-23th, 2016.
Pyroclore, Biocombustibles, Pirocloro, Biofuels, Biomasa, Biomass, (H3O)SbTeO6, 5‐Hydroxymethyl‐2‐furfural (HMF)
Pyroclore, Biocombustibles, Pirocloro, Biofuels, Biomasa, Biomass, (H3O)SbTeO6, 5‐Hydroxymethyl‐2‐furfural (HMF)
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