NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 43
·期 1
·330-337
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IF 3.201
Chaoping Yuan,Wentao Shi,Peng Chen,Huaxin Chen,Lihua Zhang,Gang Hu,Longming Jin,Haibo Xie,Qiang Zheng,Shengjun Lu
Cellulose dissolution is crucial for its regeneration and the application of its derivative materials. In this study, the dissolution of cellulose in γ-valerolactone (GVL), promoted by 1-ethyl-3-methylimidazolium acetate ([Emim]OAc), was investigated and 15 wt% α-cellulose was rapidly dissolved by the designed mixed organic electrolyte solvents (OESs) at 80 °C in 1 h. The rheological study indicated that the activation energy of dissolution is lower than that in pure [Emim]OAc, and the overlap concentration was determined to be C* = 1.7 wt%. The viscosity of the α-cellulose solution overlapped well with the complex viscosity, suggesting that the Cox–Merz law is valid therein. The potential of the solution for homogeneous derivatization through transesterification of α-cellulose with vinyl esters was also investigated at 80 °C in 4 h with a low vinyl ester/anhydroglucose unit (AGU) molar ratio of 3, achieving a cellulose laurate ester with a DS = 3.0, cellulose pivalate ester with a DS = 3.0 and cellulose chloroacetate ester with a DS = 1.43.
研究领域:
化学工程
·
材料科学
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DOI
高影响因子
Molecular Catalysis
·
2021
·
IF 5.062
Jing Bai,Canwei Cheng,Yong Liu,Chenguang Wang,Yuhe Liao,Lungang Chen,Longlong Ma
In this work, Ni-based catalysts were prepared using the impregnation method. Ni/Al 2 O 3 showed good performance with a γ‐valerolactone (GVL) yield of 99.2% from hydrogenation of levulinic acid (LA). Among the tested bimetallic catalysts , the NiCo catalyst showed better performance than NiMn, NiMo, and NiCu catalysts for the hydrogenation of LA to GVL. Catalysts with different Ni/Co ratio were synthesized, and 15%Ni-15%Co/Al 2 O 3 shows the best performance with a GVL yield of 99.5%. The textural and chemical characteristics of the NiCo/Al 2 O 3 were determined by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and H 2 temperature-programmed reduction (H 2 -TPD). This study shows that the incorporation of the Ni and Co metals formed a Ni-Co alloy, which significantly increased the activity than other Ni-based bimetallic catalysts and led to a milder condition for hydrogenation of LA to GVL. The test of reuse potential of 15%Ni-15%Co/Al 2 O 3 exhibited good stability up to 5 cycles without obvious deactivation.
研究领域:
化学工程
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催化化学
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产品关联
DOI
高影响因子
ACS Catalysis
·
2022
·
IF 13.7
Anon Bunrit,Teera Butburee,Meijiang Liu,Zhipeng Huang,Keerati Meeporn,Chaiyasit Phawa,Jian Zhang,Sanchai Kuboon,Huifang Liu,Kajornsak Faungnawakij,Feng Wang
Herein, we developed photo–thermo-dual catalytic strategies for the production of γ-valerolactone (GVL) from levulinic acid (LA) and its ester using platinum-loaded TiO2 as a dual-functional catalyst. Both catalytic systems were evaluated under mild reaction conditions. In the photocatalysis system, a base plays crucial roles in the conversion of LA and EL to GVL. The control experiments reveal that plausible mechanistic pathways of both systems proceed via the hydrogenation of the ketone group of LA to the corresponding alcohol as a major intermediate followed by a subsequent cyclization step to GVL. This dual-functional catalyst provides alternative strategies for the conversion of LA and its ester into GVL, which could pave the way for biomass utilization in a more effective and practical manner.
研究领域:
催化
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生物质转化
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化学工程
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可持续化学
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DOI
高影响因子
JOURNAL OF CATALYSIS
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2026
·
IF 6
Xiaolong Fang,Shangsong Feng,Jin Huang,Hao Li,Jinhui Zhang,Weiyi Wang,Fengjun Zhang,Yong Yang
Homogeneous selective hydrogenation often relies on sophisticated yet fragile ligands to improve catalytic performance. This not only complicates the process but also increases costs, thereby severely impeding its industrial application. In this work, we report a novel ligand-free strategy for the homogeneous conversion of levulinic acid using Ru 3 (CO) 12 , which proceeds via a substrate-promoted pathway. Under mild reaction conditions, excellent turnover numbers (up to 99000) and turnover frequencies (up to 2750 h −1 ) were achieved for the production of γ-valerolactone. Mechanistic insights reveal that a levulinic acid-derived Ru 2 (CO) 4 sawhorse-type unit was formed in situ, and a catalytic cycle is proposed based on this key intermediate, outlining a new paradigm for practical and sustainable catalysis.
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DOI
高影响因子
PLANT MOLECULAR BIOLOGY
·
2026
·Vol. 116
·期 2
·35
·
IF 3.7
Ren Fangfang,Shen Hui,Chen Weiye,Sha Siyue,Li Shanshan,Tao Xin,Li Zhuorui,Shen Weishou,Gao Nan
There is increasing interest in novel fertilizers to reduce dependency on chemical fertilizers in agriculture. Esters are promising stimulants. γ-Valerolactone, a volatile organic compound produced by Stutzerimonas stutzeri NRCB010, was suggested to promote tomato seedling growth under sterile conditions. We thus examined the effects of varying concentrations of γ-valerolactone on growth in hydroponic and greenhouse conditions, checked associated transcriptional changes, and measured the hormone contents. In this study, γ-valerolactone treatment significantly promote the tomato seedling growth, and the optimum concentration was 100 mg L − 1 and 250 mg L − 1 in hydroponic and greenhouse conditions, respectively. The content of IAA-aspartate, IAA-glutamate, indole-3-acetamide, indole-3-acetonitrile, indole-3-butyric acid, gibberellic acid 3 were all significantly increased in leaves, stem, and roots. Transcriptomic analysis revealed that when treated with γ-valerolactone for 6 h, there are more upregulated differentially expressed genes (DEGs) than downregulated DEGs, however, it’s opposite when treated with γ-valerolactone for 24 h. γ-Valerolactone may stimulate the growth of tomato seedlings through mechanisms such as photosynthesis, phytohormone signaling, and the biosynthesis of secondary metabolites. Our studies provide a theoretical basis for the application of γ -valerolactone as a new type of plant growth regulator and lay the foundation for the development of efficient and environmentally friendly agricultural biostimulants.
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DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2026
·
IF 4.8
Ying Gao,Jinxing Long
Conversion of ethyl levulinate to GVL was proposed using Pd 4 /UiO-66-NH 2 . • Pd 4 /UiO-66-NH 2 was constructed via a post-synthetic modification strategy. • Synergistic effects between Pd species and acidic sites drive superior performance. • GVL yield of 90% with 98.9% selectivity was achieved under 170 ℃ and 1.0 MPa H 2 . • The catalyst shows good recyclability, and can be reused for at least five runs. An efficient strategy is proposed for direct hydrogenation of ethyl levulinate (EL) to γ-valerolactone (GVL) using a highly dispersed palladium nanoparticles supported on the UiO-66-NH 2 framework (Pd/UiO-66-NH 2 ), which was prepared via a facile post-synthetic modification by anchoring palladium (Pd) nanoparticles on the framework's native -NH 2 groups. Under optimized conditions (170 °C, 1.0 MPa H 2 ), 90% yield and 98.9% selectivity of GVL were shown when the reaction was catalyzed by Pd 4 /UiO-66-NH 2 in cyclohexane. Catalyst characterization using XRD, N 2 adsorption-desorption, FT-IR, TEM, TGA, XPS and H 2 -TPR, confirmed that an intensive synergistic effect existed between the Pd and the acidic sites, which is responsible for the superior performance of Pd@UiO-66-NH 2 . The solvent effect and the feedstock adaptability were also investigated. Furthermore, the catalyst of Pd 4 /UiO-66-NH 2 demonstrated good stability and reusability, where no significant activity loss was shown even after five consecutive cycles. Therefore, this study provides new insights for efficient upgrading biochemical. Download: Download high-res image (188KB) Download: Download full-size image
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Guanhua Wang,Xiaoqian Liu,Bo Yang,Chuanling Si,Ashak Mahmud Parvez,Jinmyung Jang,Yonghao Ni
Lignin heterogeneity, involving complex structure and high polydispersity, is a key challenge that restricts its value-added applications. Fractionation of heterogeneous lignin into several homogeneous subdivisions is an attractive and practical strategy to overcome this limitation. In this work, γ-valerolactone (GVL), a sugar-derived product, was used as a green solvent for lignin fractionation when mixed with water. The enzymatic hydrolysis lignin (EHL) was subdivided into three different fractions (F1, F2, and F3) by dissolving it completely in 60% aqueous GVL and then following gradient precipitation in 40%, 30%, and 5% aqueous GVL solutions, sequentially. Detailed characterization techniques were conducted to provide a comprehensive evaluation of the three obtained lignin fractions. Moreover, the proposed fractionation mechanism was further investigated on the basis of Kamlet–Taft parameters. The gel permeation chromatography (GPC) analyses showed that the three fractions presented lower polydispersity than the parent EHL and, furthermore, a gradual decreasing molecular weight due to the different solubility of various molecular weight lignins in aqueous GVL solvents. The structural analyses revealed that with the decrease of molecular weight, the guaiacyl unit content in lignin fractions decreased, with significant increases of functional groups (i.e., aromatic/aliphatic hydroxyl and carboxyl groups). The solvent recycling study showed that the aqueous GVL had a high recovery, and the recycled GVL had the same lignin fractionation performance as fresh GVL. Overall, compared with traditional fractionation using multiple organic solvents, the present work provides a green and efficient route to fractionate lignin and, therefore, significantly decreases its molecular weight polydispersity and structural heterogeneity.
研究领域:
化学工程
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材料科学
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绿色化学
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生物技术
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产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2021
·Vol. 11
·期 15
·5062-5076
·
IF 6.119
Na Ji,Xinyong Diao,Zhihao Yu,Zhenyu Liu,Sinan Jiang,Xuebin Lu,Chunfeng Song,Qingling Liu,Degang Ma,Caixia Liu
The hydrogenation of levulinate esters to γ-valerolactone (GVL) is an important step in the transformation of biomass into biofuels. It is attractive to develop new efficient systems for the catalytic transfer hydrogenation (CTH) of levulinate esters to value-added GVL. In this work, a series of MoS2-based supported catalysts were prepared via an impregnation method for the CTH of biomass-derived ethyl levulinate (EL) to GVL. By comprehensive characterization and catalytic measurements, we found that the CTH activity of EL to GVL is closely related to the MoS2 morphology and acid distribution on the support. Among the catalysts with different supports, the AC support with abundant Lewis acid sites and large surface area facilitated the high dispersion of low stacked MoS2 slabs, and the MoS2-acid synergistic catalysis contributed to the superior activity and selectivity. The conversion of EL and the selectivity of GVL reached 97.2% and 91.2% under optimized conditions over the MoS2/AC catalyst (230 °C, 1 MPa H2, 1.5 h), respectively. We also conducted reaction kinetic experiments to reveal the relationship between the active site of the MoS2/AC catalyst and its catalytic performance, and the plausible reaction pathway and mechanism over MoS2/AC was proposed. The catalytic performance gradually declined during recycling tests due to the oxidation of MoS2 and can be easily recovered by resulfuration.
研究领域:
化学工程
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生物质能
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催化科学
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产品关联
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 26
·16942-16954
·
IF 4.036
Yawei Zhan,Meixin Wang,Tengfei Ma,Zhiqiang Li
In this study, the effect of the γ-valerolactone (GVL)/H2O pretreatment system on bamboo (Neosinocalamus affinis) for enzymatic hydrolysis and ethanol fermentation was investigated. The performance characterization of the pretreated bamboo substrates, including the chemical composition, the structural characteristics, and the ability to produce bioethanol, were evaluated. The recovered substrates were enzymatically hydrolyzed for 48 h and then fermented to bioethanol. For the cellulose in the raw bamboo material, the highest cellulose-to-glucose conversion yield (CGCY) was achieved at 140 °C for 2 h with GVL : H2O = 8 : 2, which was 73.39%, and the cellulose-to-ethanol conversion yield (CECY) was 67.00%. This indicated that 183.5 kg of bioethanol could be produced per ton of bamboo, which was 9.71-folds higher than that directly converted from the untreated raw bamboo powder. Under these conditions, 50.60% of the active lignin can be recovered and be used as a wood-derived feedstock for further high-valued utilization. Meanwhile, the maximum concentration of fermentation inhibitors formed after pretreatment was about 140.9 mmol L−1, and had weak inhibition to the subsequent reaction. It has been shown that the cellulose could be effectively separated from bamboo and converted into bioethanol through the GVL/H2O pretreatment system.
研究领域:
生物能源
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植物学
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产品关联
DOI
PubMed
高影响因子
ChemCatChem
·
2015
·Vol. 7
·期 8
·1372-1379
·
IF 4.556
Xing Tang,Xianhai Zeng,Zheng Li,Weifeng Li,Yetao Jiang,Lei Hu,Shijie Liu,Yong Sun,Lu Lin
Graphical In situ generated catalyst system: HCl/ZrO(OH) 2 catalysts are prepared in situ by the autonomous decomposition of ZrOCl 2 ⋅ 8 H 2 O in levulinic acid (LA)/2-butanol solution. The esterification of LA was catalyzed in tandem with hydrocyclization to γ-valerolactone (GVL) by Meerwein–Ponndorf–Verley reduction. This is the first report of HCl/ZrO(OH) 2 catalysts prepared in situ by the autonomous decomposition of ZrOCl 2 ⋅ 8 H 2 O in levulinic acid (LA)/2-butanol solution, which catalyzed the esterification of LA in tandem with hydrocyclization to γ-valerolactone (GVL) by Meerwein–Ponndorf–Verley (MPV) reduction without the use of external H 2 . A maximum GVL yield of 92.4 % from neat LA and a GVL formation rate of 1092.2 μmol g −1 min −1 were achieved in 2-butanol at 240 °C in 2 h. The in situ generated ZrO(OH) 2 was characterized comprehensively and its unexpected catalytic efficiency was attributed mainly to its extremely high surface area. A crude LA stream from the acid hydrolysis of cellulose was extracted into 2-butanol and subjected to this catalyst system to give a GVL yield of 82.0 % even in the presence of humins.
研究领域:
化学工程
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可再生能源
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催化化学
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DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 19
·11188-11199
·
IF 3.119
Liuming Song,Ruizhen Wang,Jianchun Jiang,Junming Xu,Jinsheng Gou
A cost-efficient methodology was developed for a two-step removal of hemicellulose from lignocellulosic biomass, thereby yielding C5 sugars, further separated residue, and high purity cellulose as well as lignin. In the first step of the process, an oxalic acid (OA)-assisted hydrolysis pretreatment was conducted for the selective decomposition of hemicellulose to C5 sugars. The optimized process conditions were as follows: temperature: 160 °C, OA concentration: 1%, holding time: 10 min. Under these conditions, various monosaccharides and other intermediates were obtained and more than 98.32% of the hemicellulose was removed from the original poplar. In the second step of the process, to extract lignin, a low concentration of sulfuric acid was used as a catalyst during the treatment of samples in a γ-valerolactone/H2O system; more than 91.57% lignin was removed, 82.99% cellulose was retained in the solid cellulose-rich substrates, and 94.45% (i.e., high-purity) cellulose was obtained. This method can be used for efficient fractionation of hemicellulose, cellulose, and lignin with the aim of achieving high value utilization of the entire biomass.
研究领域:
生物化学
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生物质能
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可再生资源工程
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DOI
PubMed
高影响因子
CHEMISTRY LETTERS
·
2022
·Vol. 51
·期 4
·395-398
·
IF 1.715
Zhu Yue,Li Yue,Zhao Shipeng,Jing Ran,Zhang Heqian,Sun Daolai,Sato Satoshi
Hydrogenation of γ-valerolactone (GVL) to form 1,4-pentanediol (1,4-PDO) was performed over Co/ZrO2 catalysts with a Co metal loading of 15 wt. %. The calcination of Co/ZrO2 at high temperatures significantly promoted the catalytic activity irrespective of the decrease in the specific surface area. The 750 °C-calcined Co/ZrO2 with Co2+ species exhibited a high catalytic performance: a GVL conversion of 86.1% with a 1,4-PDO selectivity of 97.2% was achieved at 165 °C under 5 MPa H2 pressure.
研究领域:
化学工程
·
催化科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）