ChemistrySelect · 2018 · 28 citations · 24 references
Natural SciencesChemical EngineeringMaterials ScienceCatalysisReaction EngineeringSurface ScienceCatalyst CharacterizationCatalyst PreparationCatalytic MaterialsCatalytic MechanismsCatalytic Reaction EngineeringSupported CatalystsCatalytic ActivityCatalytic Activity EnhancementDehydration ReactionsMetal-organic Framework CatalystsPorous CatalystsSpecific Surface AreaSpecific Surface Area AnalysisSurface Area
Abstract In this paper, a series of AlNb/SBA‐15 catalysts with various Al/Nb atom ratios were prepared by impregnation method for efficient conversion of glucose to 5‐hydroxymethylfurfural (HMF). Characterization by SEM, TEM, BET and XRD showed that the microstructure after impregnation of the active components was preserved, similar to that of SBA‐15, although the pore size and specific surface area decreased to some extent with the increase of Al/Nb atom ratio due to the thickening of the pore wall, which was due to the deposition of the active component salts. Py‐IR and NH 3 ‐TPD analysis indicated that AlNb/SBA‐15 had both Bronsted acid sites and Lewis acid sites simultaneously after incorporation of the Al species and they were tunable by adjusting the Al/Nb atom ratio. The catalyst with Al/Nb atom ratio of 2:3 exhibited the suitable strength of Lewis and Bronsted acid and the highest total acid amount, as a result, showing the highest catalytic activity in glucose dehydration to HMF. As high as 55.7% of HMF yield with 93.4% glucose conversion was obtained when reacting at 170 °C for 6.0 h using methyl iso‐butyl ketone (MIBK)/water with a volume ratio of 2 as the reaction media.
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Triblock Copolymer Syntheses of Mesoporous Silica with Periodic 50 to 300 Angstrom Pores
Dongyuan Zhao, Jianglin Feng, Qisheng Huo et al. · Science · 1998 · 11.6K citations