Highly active niobium-loaded montmorillonite catalysts for the production of 5-hydroxymethylfurfural from glucose

Abstract

Niobium-loaded montmorillonite was employed as a highly efficient catalyst for the catalytic conversion of glucose to 5-HMF in a biphasic solvent.

Direct Alkylation of Benzene at Lower Temperatures in the Liquid Phase: Catalysis by Montmorillonites as Noble‐Metal‐Free Solid Acids

“…Montmorillonite, a layered acidic clay, has recently received much attention as a solid acid catalyst for liquid‐phase organic syntheses . The unique acidity of montmorillonite affords much higher efficiencies for acid‐catalyzed carbon‐carbon/heteroatom bond‐forming reactions such as hydroalkylation and allylsilylation compared with other zeolites and inorganic/organic homogeneous acids at 100–180 °C . In this study, the direct alkylation of benzene using alkanes at 150 °C was carried out using cation‐exchanged montmorillonites as solid acid catalysts.…”

“…[15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] The unique acidity of montmorillonite affords much higher efficiencies for acid-catalyzed carbon-carbon/ heteroatom bond-forming reactions such as hydroalkylation and allylsilylation compared with other zeolites and inorganic/ organic homogeneous acids at 100-180°C. [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] In this study, the direct alkylation of benzene using alkanes at 150°C was carried out using cation-exchanged montmorillonites as solid acid catalysts. The layered structure of the proton-exchanged montmorillonite (H-mont) enabled control of the product selectivity by choosing alkylation of benzene or cracking of alkanes.…”

Dehydration of sugars to 5-hydroxymethylfurfural and non-stoichiometric formic and levulinic acids over mesoporous Ta and Ta-W oxide solid acid catalysts

“…Solid acid catalysts based on oxides of Nb [26][27][28][29][30][31], Ta [32][33][34], Sn [35,36], Zr [37] and Ti [38][39][40][41] have been employed in the synthesis of HMF. Among them, niobic acid (Nb2O5•nH2O) [27] and tantalic acid (Ta2O5•nH2O) [32] are both considered as water-tolerant solid acids which display good activity in the dehydration of glucose to HMF.…”

Enhanced conversion of glucose to fructose over naturalattapulgite catalyst promoted by CeO2 in water

“…Typically, these sugar platform compounds, especially glucose, is very attractive in the clean production of polyols, i.e, sorbitol, a promising feedstocks used for the production renewable biogasoline mainly consisted of C 5 -C 6 alkanes by using catalytic processing techniques in the aqueous phase. [1][2][3] Moreover, glucose can be converted into other valuable chemicals including levulinic acid and 5hydroxymethylfurfural (5-HMF), [4][5][6][7][8][9][10] the important precursor of bio-fuels. [11][12][13] However, it is worth mentioning that the formation of 5-HMF from the dehydration of glucose is considered as the key process.…”