Systematic Modification of UiO‐66 Metal‐Organic Frameworks for Glucose Conversion into 5‐Hydroxymethyl Furfural in Water

Abstract

Metal organic framework UiO-66 is studied as an adaptable heterogeneous catalyst for glucose conversion. UiO-66 was modified by; i) partial linker substitution, ii) particle size modulation and iii) linker defects. We studied the effect of crystallinity and functional groups on the glucose conversion and product yields. The main products are: i) fructose from the isomerisation of glucose, ii) mannose from the epimerisation of glucose and iii) 5-hydroxymethyl furfural from the dehydration of fructose. We found that defective and nano crystalline UiO-66 catalyst performs best for isomerisation. When 50 % of the linkers of UiO-66 are replaced by a sulfonate-containing linker, the catalyst shows higher isomerisation activity than other UiO-66 catalysts. Naphthalene-dicarboxylate linkers were introduced to induce hydrophobicity and this catalyst further increased isomerisation activity showing 31 % fructose selectivity. Finally, the promising catalysts were tested in a flow reactor and a bifunctional mixed linker catalyst possessing both hydrophobic and acidic functional groups is shown to be stable in a time-onstream study.

Tuning of Selectivity for Sustainable Production of Acrolein from Glycerol

“…[65][66][67] It should be noted that these materials are actively used in the dehydration of C 5 À C 6 sugars into platform chemicals such as furfural and 5-hydroxymethylfurfural (HMF). [68][69][70][71][72][73] Table 2 represents comparison of various MOFs activity and selectivity in the dehydration of xylose and glucose as well as glycerol. Despite the fact that it was possible to achieve excellent results using MOF-808 as a catalyst for the dehydration of glycerol, this material is stable only for 10 h. At the same time, MOF catalysts are stable in catalytic dehydration of C 5 À C 6 sugars up to 10 cycles.…”

Progress in Selective Conversion of 5‐Hydroxymethylfurfural to DHMF and DMF

“…[12][13] In order to make full use of biomass resource, fine chemicals, and biological liquid fuel oil can be prepared by hydrogenation, oxidation, hydrolysis, esterification, reductive depolymerisationenzymatic hydrolysis, and catalytic pyrolysis. [14][15][16][17][18][19][20][21][22][23][24][25][26] 5-hydroxymethylfurfural (HMF) is a very momentous platform compound, [27][28][29][30] HMF was obtained though the dehydration of biomass-derived carbohydrates, such as glucose, [31][32][33][34][35] fructose, [36][37][38][39][40] sucrose, [41][42][43][44][45] inulin, [46][47][48][49][50] cellobiose [51][52][53][54][55] and cellulose. [29,[56][57][58]…”

Improving the Glucose to Fructose Isomerization via Epitaxial‐Grafting of Niobium in UIO‐66 Framework

“…Glucose conversion to various value‐added chemicals has been widely achieved using various Zr‐MOF based catalysts [77‐79] . Glucose isomerization catalysed by the Lewis acid‐based Zr‐MOF catalysts is known in the literature due to the Lewis acidity of Zr 4+ in the Zr‐oxo cluster of the Zr‐MOF [74,75] .…”