Conversion of concentrated sugar solutions into 5-hydroxymethyl furfural and furfural using Brönsted acidic ionic liquids

Matsagar, Babasaheb M.; Munshi, Mudassir K.; Kelkar, Ashutosh A.; Dhepe, Paresh L.

doi:10.1039/c5cy00858a

Cited by 59 publications

(28 citation statements)

References 48 publications

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“…The properties of ILs can be easily tuned by changing anion part of IL or by modification of alkyl substituent of the cation. However, ILs are expensive, and recyclability is a problem in many reactions …”

Section: Introductionmentioning

confidence: 99%

“…However, ILs are expensive, and recyclability is a problem in many reactions. [37] The reductive lignin depolymerization is one of the most effective strategies to upgrade the bio-fuel because the oxygen is removed in the process resulting in higher energy density, increasing the potential of replacing the crude oil. It favors a higher yield of liquid products including phenolic monomers.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Solvent, Role of Formic Acid and Rh/C Catalyst for the Efficient Liquefaction of Lignin

et al. 2019

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We demonstrate highly efficient liquefaction of alkali lignin with a very high yield of THF‐soluble bio‐oil (91.5 wt %) using formic acid (FA) and Rh/C catalyst under relatively mild reaction conditions (250 °C, 6 h) in EtOH−H2O co‐solvent system. The monomeric products are identified in which alkyl guaiacols accounts for the main proportion. The role of FA was not only used as a liquid‐phase in‐situ hydrogen source but also acts as organic acid which can catalyze the hydrolysis reaction of −C−O−C ether bonds of lignin. Moreover, in the present study, the role of Rh/C and FA is demonstrated for the liquefaction of lignin. The replacement of pure H2 gas by the liquid‐phase FA (hydrogen source) can effectively prevent the char formation. The utilization of Rh/C catalyst helps for the conversion of alkenyl guaiacols to alkyl guaiacols suggesting the hydrogenation of phenolic monomers and further cleavage by hydrogenation results in the formation of bio‐oil with lower molecular weight (Mn=466 g mol−1) as well as lower O/C ratio (0.26).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Solvent, Role of Formic Acid and Rh/C Catalyst for the Efficient Liquefaction of Lignin

et al. 2019

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“…[114,164] To this aim, the development of heterogeneous acid catalysts featuringh igh resistance to water and efficiency under mild reactionc onditions is deemed critical. [114,164] To this aim, the development of heterogeneous acid catalysts featuringh igh resistance to water and efficiency under mild reactionc onditions is deemed critical.…”

Section: Discussionmentioning

confidence: 99%

“…The design of sustainable processesf or the conversion of biomass to useful chemicals has been identified as ap riority in the biorefinery industry. [114,164] To this aim, the development of heterogeneous acid catalysts featuringh igh resistance to water and efficiency under mild reactionc onditions is deemed critical.…”

Section: Discussionmentioning

confidence: 99%

“…Furfural is an importantp latform chemical obtainable from hemicellulose-derived xylose through challenging threefold acid-catalyzed dehydration at high temperatures. [114,115] Current production methods rely on aqueous-phase batch operations and use of homogeneous mineral acids (H 2 SO 4 ). [116,117] Several oil-alternative, key industriali ntermediates and consumer chemicals are accessible throughf urtherf urfural processing.…”

Section: Chemical Compositionmentioning

confidence: 99%

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Low‐Temperature Continuous‐Flow Dehydration of Xylose Over Water‐Tolerant Niobia–Titania Heterogeneous Catalysts

et al. 2018

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The sustainable conversion of vegetable biomass-derived feeds to useful chemicals requires innovative routes meeting environmental and economical criteria. The approach herein pursued is the synthesis of water-tolerant, unconventional solid acid monolithic catalysts based on a mixed niobia-titania skeleton building up a hierarchical open-cell network of meso- and macropores, and tailored for use under continuous-flow conditions. The materials were characterized by spectroscopic, microscopy, and diffraction techniques, showing a reproducible isotropic structure and an increasing Lewis/Brønsted acid sites ratio with increasing Nb content. The catalytic dehydration reaction of xylose to furfural was investigated as a representative application. The efficiency of the catalyst was found to be dramatically affected by the niobia content in the titania lattice. The presence of as low as 2 wt % niobium resulted in the highest furfural yield at 140 °C under continuous-flow conditions, by using H O/γ-valerolactone as a safe monophasic solvent system. The interception of a transient 2,5-anhydroxylose species suggested the dehydration process occurs via a cyclic intermediates mechanism. The catalytic activity and the formation of the anhydro intermediate were related to the Lewis acid sites (LAS)/Brønsted acid sites (BAS) ratio and indicated a significant contribution of xylose-xylulose isomerization. No significant catalyst deactivation was observed over 4 days usage.

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Ionic Liquid–Assisted Single‐Drop Microextraction: A Miniaturized Sample Preparation Tool for Various Analytes

Koduru

Lingamdinne

2021

Miniaturized Analytical Devices

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Conversion of concentrated sugar solutions into 5-hydroxymethyl furfural and furfural using Brönsted acidic ionic liquids

Abstract: Using recyclable and green ionic liquids in catalytic amounts, renewable sugars are dehydrated into furans with high yields.

Cited by 59 publications

References 48 publications

Effect of Solvent, Role of Formic Acid and Rh/C Catalyst for the Efficient Liquefaction of Lignin

Effect of Solvent, Role of Formic Acid and Rh/C Catalyst for the Efficient Liquefaction of Lignin

Low‐Temperature Continuous‐Flow Dehydration of Xylose Over Water‐Tolerant Niobia–Titania Heterogeneous Catalysts

Ionic Liquid–Assisted Single‐Drop Microextraction: A Miniaturized Sample Preparation Tool for Various Analytes

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