Synthesis of furfural from xylan in γ-valerolactone/molten salt hydrate biphasic system

Liu, Chao; Wei, Linshan; Yin, Xiao; Pan, Xueyuan; Hu, Jun; Li, Neng; Xu, Junming; Jiang, Jianchun; Wang, Kui

doi:10.1016/j.cej.2021.130608

Cited by 43 publications

(19 citation statements)

References 53 publications

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“…Fortunately, the destroyed cellulose is still a promising material that can be thermally converted into special chemicals (such as furans). 46,47 On the basis of the above analysis and the difference in lignin structures of hardwood and softwood, a reaction scheme for the current system is proposed in Figure 8. Hardwood contains both S-and G-type lignin and abundant weak bonds (mainly β-O-4 bond), while softwood contains dominant Gtype lignin and more strong bonds (such as 5−5 and 4-O-5 bonds).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Promoted Production of Phenolic Monomers from Lignin-First Depolymerization of Lignocellulose over Ru Supported on Biochar by N,P-co-Doping

Ding

Zhu

et al. 2022

ACS Sustainable Chem. Eng.

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Co-doping of heteroatoms into the support of metal-supported catalysts is a prevalent method to improve the catalytic performance by adjusting metal–support interactions. This paper investigated the catalytic performances of Ru supported on biomass-derived char (Ru@Char), N-doped char (Ru@N-Char), and N,P-co-doped char (Ru@NP-Char) in the emerging lignin-first depolymerization for both poplar (hardwood) and pine (softwood) samples, with an emphasis on the production of phenolic monomers. Various characterizations of the prepared catalysts showed that the codoping of N,P not only facilitated the formation of micropores in the char but also introduced weak and moderate acid sites. Furthermore, the sizes of Ru nanoparticles on the codoped char became smaller, and the proportion of metallic Ru species was increased, resulting from electron transfer from Ru to the codoped char. The yields of the phenolic monomers from poplar and pine over Ru@NP-Char were as high as 57.98 and 17.53 wt % Klason lignin, respectively, which were improved by factors of 1.4–2.5 in comparison to Ru@Char and Ru@N-Char. Full delignification during the depolymerization of both poplar and pine was also achieved over Ru@NP-Char.

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Section: ■ Results and Discussionmentioning

confidence: 99%

“…Also, the sugar retention in the pine-derived solid residue over Ru@NP-Char was only 55% (Figure ). Fortunately, the destroyed cellulose is still a promising material that can be thermally converted into special chemicals (such as furans). , …”

Section: Resultsmentioning

confidence: 99%

Promoted Production of Phenolic Monomers from Lignin-First Depolymerization of Lignocellulose over Ru Supported on Biochar by N,P-co-Doping

Ding

Zhu

et al. 2022

ACS Sustainable Chem. Eng.

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“…Recently, an acidic aqueous biphasic system containing an ionic liquid tributyl tetradecyl phosphonium chloride and HCl was used for xylan conversion under microwave irradiation, providing a furfural yield of 78.8% . A similar yield of 77.2% for this transformation was also obtained in a γ-valerolactone (GVL)/molten salt hydrate biphasic system with Al 2 (SO 4 ) 3 at 140 °C …”

Section: Introductionmentioning

confidence: 97%

Understanding Hβ Zeolite in 1,4-Dioxane Efficiently Converts Hemicellulose-Related Sugars to Furfural

et al. 2022

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Furfural represents one of the most valuable biomass-derived platform molecules. Its selective production with a smart and tractable catalytic system is highly attractive for technical implementation, yet remains challenging. We herein report a promising protocol involving the mature Hβ zeolites in pure 1,4-dioxane to convert hemicellulose-related sugars into furfural with high rate and impressive selectivity under mild operating conditions. Furfural yields as high as 93.6% (from xylose) and 85.9% (from xylan) were accomplished at 140 °C in 40 min. The solvent 1,4-dioxane served as a shield to maintain the crystal structure and acidic center of Hβ as well as to inhibit the polymerization of furfural. The synergistic action of Hβ with 1,4dioxane largely promoted the selective conversion of xylose to furfural, as the multiple immobilized acid sites of Hβ in 1,4-dioxane medium accelerated xylose-to-xylulose isomerization. The dehydration process was favorable based on its apparent activation energy of 39.1 kJ mol −1 , leading to a high turnover frequency of 53.8 h −1 . Density functional theory calculations revealed that the superior catalytic behavior could be ascribed to the higher adsorption of xylose than 1,4-dioxane, allowing xylose molecules to fully access the open Al sites of Hβ and the low Gibbs free energy barrier of xylose isomerization to xylulose in 1,4-dioxane over the Hβ catalyst. Moreover, the heterogeneous zeolite catalyst and the single low-boiling-point solvent 1,4-dioxane (101 °C) were readily recovered from the product with outstanding reusability. This contribution not only opens a high potential avenue for the selective production of furfural but also sheds light on the coordination mechanism of Hβ zeolite and 1,4-dioxane toward developing tailored processes.

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“…1,2 Lignocellulosic biomasses, such as forestry waste, grasses, and agricultural residues, are cheap, renewable, and sustainable resources for biofuel production. 3,4 One of the most promising lignocellulosic materials for biofuel production is bamboo resources, which grows widely in Asia. In China, bamboo accounts for 1/4th of the total bamboo forest area globally.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the mechanism of milk protein as an efficient lignin blocker for boosting the enzymatic hydrolysis of lignocellulosic substrates

et al. 2022

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Synthesis of furfural from xylan in γ-valerolactone/molten salt hydrate biphasic system

Cited by 43 publications

References 53 publications

Promoted Production of Phenolic Monomers from Lignin-First Depolymerization of Lignocellulose over Ru Supported on Biochar by N,P-co-Doping

Promoted Production of Phenolic Monomers from Lignin-First Depolymerization of Lignocellulose over Ru Supported on Biochar by N,P-co-Doping

Understanding Hβ Zeolite in 1,4-Dioxane Efficiently Converts Hemicellulose-Related Sugars to Furfural

Evaluating the mechanism of milk protein as an efficient lignin blocker for boosting the enzymatic hydrolysis of lignocellulosic substrates

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