Influencia del proceso de síntesis de materiales mesoporosos ácidos en la obtención de hmf a partir de fructosa
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2020
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Motivados por el agotamiento irreversible de los recursos fósiles, en la actualidad se realizan esfuer-zos en obtener moléculas orgánicas de valor agregado a partir de biomasa. El 5-hidroximetilfurfural (HMF) es, junto al furfural, uno de los productos químicos de fuentes renovables de mayor interés por su potencial empleo en la obtención de bioplásticos, biocombustibles, lubricantes y adhesivos basados en furanos. Aquí presentamos dos catalizadores sintetizados por dos vías de síntesis diferentes, ambos con la incorporación de especies oxidadas de Zr, los cuales fueron caracterizados por XRD de bajo y alto ángulo, XPS y TPD-NH3. Los análisis demuestran la obtención de mesoporosos con arreglo de poros homogéneo, la incorporación de especies de Zr en red y extra-red y la generación de una acidez superficial moderada. Se discuten las propiedades obtenidas en relación a la reacción de deshidratación de fructosa a HMF, su conversión y rendimiento. El material Zr-SBA-15, que incorpora Zr in situ, de-muestra tener la mayor actividad catalítica, convirtiendo un 61,7 % de la fructosa y generando HMF con un rendimiento del 51,9 % en 2 h de reacción a 150 °C en un arreglo catalizador – solución acuosa de fructosa al 30 % – metil-isobutil-cetona (MIKB):2-butanol 7:3 P/P.
Motivated by the irreversible depletion of fossil resources, efforts are currently being made to obtain organic value-added molecules from biomass. 5-hydroxymethylfurfural (HMF) is, together with furfu-ral, one of the chemical products from renewable sources of greatest interest for its potential use in obtaining bioplastics, biofuels, lubricants and adhesives based on furans. Here we present two catalysts synthesized by two different synthesis pathways, both with the incorporation of oxidized Zr species, which were characterized by low and high angle XRD, XPS and TPD-NH3. The analyzes show the obtaining of mesoporosos with homogeneous pores arrangement, the incorporation of Zr species in net and extra-net and the generation of a moderate superficial acidity. The attained properties in relation to the reaction of dehydration of fructose to HMF, its conversion and yield are discussed. The Zr-SBA-15 material, which incorporates Zr in situ, shows to have the highest catalytic activity, converting 61.7% of the fructose and generating HMF with a yield of 51.9% in 2 h of reaction to 150 °C in an arrangement catalyst – 30% fructose aqueous solution – methyl isobutyl ketone (MIKB):2-butanol 7: 3 w/w.
Motivated by the irreversible depletion of fossil resources, efforts are currently being made to obtain organic value-added molecules from biomass. 5-hydroxymethylfurfural (HMF) is, together with furfu-ral, one of the chemical products from renewable sources of greatest interest for its potential use in obtaining bioplastics, biofuels, lubricants and adhesives based on furans. Here we present two catalysts synthesized by two different synthesis pathways, both with the incorporation of oxidized Zr species, which were characterized by low and high angle XRD, XPS and TPD-NH3. The analyzes show the obtaining of mesoporosos with homogeneous pores arrangement, the incorporation of Zr species in net and extra-net and the generation of a moderate superficial acidity. The attained properties in relation to the reaction of dehydration of fructose to HMF, its conversion and yield are discussed. The Zr-SBA-15 material, which incorporates Zr in situ, shows to have the highest catalytic activity, converting 61.7% of the fructose and generating HMF with a yield of 51.9% in 2 h of reaction to 150 °C in an arrangement catalyst – 30% fructose aqueous solution – methyl isobutyl ketone (MIKB):2-butanol 7: 3 w/w.
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Biomasa, Biocombustibles, Fructosa, 5-Hidroximetil-furfural (HMF), mesoporosos ácidos
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