2018
DOI: 10.1002/slct.201800081
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AlNb/SBA‐15 Catalysts with Tunable Lewis and Bronsted Acidic Sites for Glucose Conversion to HMF

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… Show more

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Cited by 23 publications
(4 citation statements)
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“…It is known that, the dehydration of glucose moiety into HMF is more difficult than fructose because the reactivity of aldohexoses is lower than ketohexoses in dehydration reaction . In addition, the conversion of glucose into HMF proceeds via two steps: (I) the isomerization of glucose into fructose, and followed by the (II) dehydration of fructose into HMF; and the isomerization of glucose into fructose is more efficient with an enzyme, a base or a Lewis acid catalyst .…”
Section: Resultsmentioning
confidence: 99%
“…It is known that, the dehydration of glucose moiety into HMF is more difficult than fructose because the reactivity of aldohexoses is lower than ketohexoses in dehydration reaction . In addition, the conversion of glucose into HMF proceeds via two steps: (I) the isomerization of glucose into fructose, and followed by the (II) dehydration of fructose into HMF; and the isomerization of glucose into fructose is more efficient with an enzyme, a base or a Lewis acid catalyst .…”
Section: Resultsmentioning
confidence: 99%
“…Catalytic dehydration of glucose has so far been carried out in biphasic solvent systems containing organic solvent, commonly DMSO, MIBK, and THF in combination with water to achieve high HMF yield. ,, However, it has been proven that THF/H 2 O is the most efficient biphasic reaction medium . The strong miscibility of THF with water can take the generated water away from the reaction system, thus preventing the side reactions due to the presence of water molecules.…”
Section: Resultsmentioning
confidence: 99%
“…Although the high catalytic activity of bifunctional solid acid catalysts has been widely reported in ionic liquids ,,,, as well as organic solvents, there is a growing interest in conversion of glucose to HMF in a biphasic reaction medium. The use of biphasic solvent system can substantially suppress the rehydration of produced HMF into undesirable levulinic and formic acid in water through continuous extraction of HMF into the organic phase, resulting in a high HMF yield and improved catalyst stabilization. The addition of sodium chloride (NaCl) to the biphasic reaction medium can improve the HMF yield through the mechanism known as the salting-out effect. , In fact, the presence of NaCl can increase the partition coefficient of HMF in biphasic systems, which increases the HMF selectivity by removing it more efficiently from the reactive aqueous solution. NaCl is also beneficial for creating biphasic systems with solvents that are otherwise completely miscible with water .…”
Section: Introductionmentioning
confidence: 99%
“…Metal oxides, as materials par excellence in heterogeneous catalysis, have been extensively studied. AlNb/SBA-15 catalysts have been tested in the conversion of glucose to HMF using MIBK/H 2 O as solvent mixture [103]. By varying the Al/Nb atomic ratios, the strength and quantity of Brønsted and Lewis acid sites were successfully tuned.…”
Section: Glucose Conversion To Hmfmentioning
confidence: 99%