Preparation of 5-hydroxymethylfurfural from glucose catalyzed by dealuminized molecular sieve solid acids
HY molecular sieves were dealuminized with nitric acid of different concentrations.The dealuminized HY molecular sieves had different specific surface areas and pore sizes.The Sn-doped bifunctional catalyst for the conversion of glucose to 5-HMF was prepared by impregnation method using the dealuminized molecular sieve as the carrier.The catalysts were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),N2 adsorption/desorption,X-ray photoelectron spectroscopy(XPS)and acid-base titration.The results showed that the synthesized 0.5mol/L-10％Sn-HY had mesoporous structure,octahedral morphology and suitable B/L acid site ratio.In the reaction system of methyl isobutyl ketone(MIBK)and NaCl-H2O,the yield of 5-hydroxymethylfurfural was 67.3％under the optimized conditions of 0.2g catalyst,165℃ and 60min.After five cycles,the 5-HMF yield could still reach 49％,indicating that the catalyst had good stability.Meanwhile,the reaction mechanism for the conversion of glucose to 5-HMF was preliminarily investigated.Overall,this work established an efficient multiphase catalytic system that demonstrated the great potential of converting biomass into platform compounds.
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