Graphene oxide as a sustainable metal and solvent free catalyst for dehydration of fructose to 5-HMF: A new and green protocol

Shaikh, Melad; Singh, Sunil Kumar; Khilari, Santimoy; Sahu, Mahendra; Ranganath, Kalluri V. S.

doi:10.1016/j.catcom.2017.12.018

Cited by 36 publications

(11 citation statements)

References 34 publications

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“…Control experiments showed that a small number of sulfonic groups and an abundance of oxygen-containing groups such as epoxides and carboxylates have a significant synergic effect during the catalytic processes. Very recently, Shaikh et al 112 used graphene oxides as the metal-free and solvent-free catalyst for the dehydration of fructose, and the fructose conversion and HMF selectivity reached as high as 90% and 87%, respectively ( Table 2). The reduced graphene oxide-supported tungsten trioxide (WO 3 /RGO) is also highly efficient for the catalytic dehydration of fructose, and the HMF yield amounts to 84.2% with nearly 100% fructose conversion ( Table 2).…”

Section: Dehydration Of Fructose In Other Solventsmentioning

confidence: 99%

“…Control experiments showed that a small number of sulfonic groups and an abundance of oxygen‐containing groups such as epoxides and carboxylates have a significant synergic effect during the catalytic processes. Very recently, Shaikh et al . used graphene oxides as the metal‐free and solvent‐free catalyst for the dehydration of fructose, and the fructose conversion and HMF selectivity reached as high as 90% and 87%, respectively (Table ).…”

Section: Dehydration Of Fructose By Heterogeneous Catalystsmentioning

confidence: 99%

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Catalytic dehydration of hexose sugars to 5‐hydroxymethylfural

Zou

Zhu

Wang

et al. 2018

Biofuels Bioprod Bioref

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The catalytic conversion of cellulosic biomass to downstream products provides a viable solution to alleviate the energy crisis and global warming. This article provides a relatively comprehensive review of the dehydration of glucose (the monomer of cellulose) and fructose considering various catalyst and solvent systems. Biphasic solvents and heterogeneous systems are recommended from the point of view of industrial applications. A two‐step catalytic conversion of glucose via fructose has been envisaged: first, isomerization of glucose to fructose, which has been extensively discussed in this review, and then transformation of fructose to downstream products. Two‐step tandem catalytic reactions from glucose to downstream products (i.e., one‐pot synthesis via fructose) are also attractive for industrial applications and should be given more attention. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd

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Section: Dehydration Of Fructose In Other Solventsmentioning

confidence: 99%

Section: Dehydration Of Fructose By Heterogeneous Catalystsmentioning

confidence: 99%

Catalytic dehydration of hexose sugars to 5‐hydroxymethylfural

Zou

Zhu

Wang

et al. 2018

Biofuels Bioprod Bioref

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“…The bands at 842 and 1574 cm −1 are attributed to the stretching vibration of PF 6 − and the carbon-nitrogen bond (C-N) inside BMIMPF 6 , respectively [42][43][44][45]. In addition, the FT-IR spectrum of GNs shows the bands at 1649 cm −1 for carbonyl (C=O) [46], which means that GNs were partially oxidized to graphene oxide (GO) during the heat treatment of expandable graphite. These results clearly indicate that ionic liquids have been successfully inserted into GNs.…”

Section: Characterization Methodsmentioning

confidence: 99%

Preparation of Ionic Liquid-Coated Graphene Nanosheets/PTFE Nanocomposite for Stretchable, Flexible Conductor via a Pre-Stretch Processing

Kou

et al. 2019

Nanomaterials

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The various volume concentrations of ionic liquid-modified graphene nanosheets filled polytetrafluoroethylene nanocomposites (IL-GNs/PTFE) for flexible conductors were fabricated via a pre-stretch processing method after cold-press sintering. The results indicated that pre-stretching has no significant weakening in the electrical conductivity of the nanocomposites, while the Young’s modulus greatly reduced by 62.5%, which is more suitable for flexible conductors. This may be because the reduced conductivity by the destructive conductive pathway cancels out the enhanced conductivity by the increased interlamellar spacing of IL-GNs via a pre-stretch processing, and the nanocomposite exhibits a phase transition from two to three-phase (with the introduction of an air phase) during pre-stretching. It was also found that the tensile strength of the nanocomposites was enhanced by 42.9% and the elongation at break and thermal conductivity decreased slightly with the same filler content after pre-stretching. The electrical conductivity of the pre-stretched nanocomposites tended to stabilize at 5.5 × 10−2 s·m−1, when the volume content of the packings achieved a percolation threshold (1.49 vol%). Meanwhile, the electrical resistivity of the pre-stretched 3.0 vol% IL-GNs/PTFE nanocomposite was slightly reduced by 0.30%, 0.38%, and 0.87% respectively after 180° twisting, 180° bending, and 10% stretching strain for 1000 cycles.

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“…Recently,t he possibility to perform important organic reactions by using graphite oxide as ac atalyst under solvent-free conditions has been reported. [28,[46][47][48][49][50][51][52][53][54][55] In particular,t he higher ability of graphite oxide to exert its catalytic activity under solvent-free conditions rather than in the presence of water or usually toxic solvents has been clearly shown in dehydration reactions, [54] thioacetalization reactions, [49] and multicomponent couplingr eactions. [48,51] As election of thesel iterature results is collected in Scheme1.…”

Section: Catalytic Activity Of Go In Organic Synthesis Under Solvent-mentioning

confidence: 99%

Graphene‐Based Carbocatalysts for Thermoset Polymers and for Diastereoselective and Enantioselective Organic Synthesis

Acocella

Guerra

2018

ChemCatChem

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This review reports on the catalytic activity of graphene oxide (GO) and high‐surface‐area graphite (HSAG) for some relevant organic reactions. It is shown that the main drawbacks of graphite‐based catalysts, that is, high catalyst loading and generally poor selectivity, can often be removed by operating under solvent‐free conditions. Moreover, some reactions that are catalyzed by GO as well as HSAG are presented. For these reactions, π stacking of the aromatic substrates with the graphitic planes plays a predominant role in the catalytic activity and the unexpected diastereoselective and enantioselective behaviors.

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Graphene oxide as a sustainable metal and solvent free catalyst for dehydration of fructose to 5-HMF: A new and green protocol

Cited by 36 publications

References 34 publications

Catalytic dehydration of hexose sugars to 5‐hydroxymethylfural

Catalytic dehydration of hexose sugars to 5‐hydroxymethylfural

Preparation of Ionic Liquid-Coated Graphene Nanosheets/PTFE Nanocomposite for Stretchable, Flexible Conductor via a Pre-Stretch Processing

Graphene‐Based Carbocatalysts for Thermoset Polymers and for Diastereoselective and Enantioselective Organic Synthesis

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