Tandem Lewis acid/Brønsted acid-catalyzed conversion of carbohydrates to 5-hydroxymethylfurfural using zeolite beta

Abstract

We conduct a combined experimental and computational study to reveal the kinetics of tandem glucose isomerization and fructose dehydration to 5-hydroxymethylfurfural (HMF) over a

Comprehensive Understanding of the Role of Brønsted and Lewis Acid Sites in Glucose Conversion into 5‐Hydromethylfurfural

“…Previous studies [8][9][10] have indicated that B/L had an effect on HMF selectivity,t hus, B/L with variousL */L wasc alculated, and the correlation is presented in Figure 4b.A tasimilarL */L ratio, the HMF selectivity versusB /L exhibitedavolcano-type curve, which indicates that there is ab alance of Lewisa nd Brønsted acids for the glucose isomerization to fructosea nd fructose dehydration to HMF,a nd not that ah igher B/L corresponds to ab etter selectivity to HMF.M oreover,t his surprising result was not only consistent with the studies reportedb yO rdomsky et al, [8,13] in which al ow B/L (ca. 0.09-0.27) promoted the formationo fH MF from glucosea nd inhibited the formation of humins, but also in agreement with the study of Zhang et al, [10] in which ah igh B/L (ca.…”

“…Ar ecent study showed that the HMF formation rate exhibitedavolcano-type curve versusB /L, and the maximum HMF yield approached 60 %i nb iphasic conditions. [9] These reports indicated that the Lewis acid sites played important role in the isomerization of glucose, and the HMF selectivity was correlated to B/L. However,t ot he best of our knowledge,n o clear correlation between the strengtha nd type of acid sites and product selectivity has ever been reported.…”

“…To overcome this challenge, many groups have explored the mechanism for the isomerization of glucosea nd dehydration of fructosetoHMF. [4,[6][7][8][9][10] Vlachos et al [6] investigated the mechanisms of glucose isomerization in aqueous media over variousL ewis acids, metal(-III) chlorides, and found that the metal chlorides isomerized glucose to fructose through aC 2 -C 1 intramolecular hydride transfer.R ecently,t he elucidation of how the surface acidities of solid acid catalysts work on the Lewisacid catalyzed glucose isomerization reaction has received much attention. Ak ey development in glucoseisomerization by heterogeneous catalytic systemsw as made by Davis and co-workers,w ho established The conversiono fg lucose and selectivity into 5-hydromethylfurfural (HMF) were investigatedo ver various silica-alumina composite (AlSiO) catalysts.…”

The Chemical Conversion of Biomass-Derived Saccharides: an Overview

“…23,74,108 H-Beta is not an efficient catalyst for HMF production from glucose, even though it is bifunctional. 154 Similarly, HMF yield is higher using the bifunctional PVP-SO 3 H-SBA-15 than a combination of PVP in solution and SO 3 H-SBA-15. 117 Bifunctional catalysts containing redox and acid functionalities (usually metal nanoparticles supported in metal oxides) also have important application in the conversion of biomass-derived saccharides.…”

Heterogeneous Nb-containing catalyst/N,N-dimethylacetamide–salt mixtures: novel and efficient catalytic systems for the dehydration of fructose

“…[1][2][3][4][5] Among various processes explored for biomass transformation, dehydration of carbohydrates, an important type of biomass, to produce 5-hydroxymethylfurfural (HMF) is one of the most successful routes. [6][7][8][9] As one of the top building block compounds obtained from biomass, 10 HMF can be transformed into many kinds of value-added compounds and materials, [11][12][13][14] which are currently produced mainly from petroleum.…”