Polymers
·
2025
·Vol. 17
·期 7
·857
·
IF 4.9
Bolun Li,Mengyan Wang,Huixiang Luo,Kaina Li,Yanlong Jia,Mingjie Fu,Chenyu Jiang,Shuangquan Yao,Yongjun Yin
As a carbon-neutral and renewable raw material, cellulose can be transformed into biomass fuels to reduce the dependence on fossil fuels and carbon dioxide emissions. In view of harsh reaction conditions, low selectivity of product, and easy deactivation of the catalyst, this study studied the use of photothermal catalytic technology to convert cellulose into bio-oil rich in levulinic acid. It was discovered that a synergistic effect between heating and photocatalysis is present in cellulose degradation. Different metals were loaded on carbon nanotubes doped with titanium dioxide to prepare different photothermal catalysts, and their catalytic effects on cellulose were compared. It was found that TiO2-CNT loaded with platinum metal exhibited the highest catalytic performance. By adopting Pt/TiO2-CNT as the catalyst, the conversion rate of bio-oil reached 99.44%, and the selectivity of LA reached 44.41% at 220 °C for 3 h. As the photothermal catalysis increased the H/C ratio and decreased the O/C ratio of the liquid product, the calorific value reached 21.01 MJ/kg. This study can promote the further industrial application of lignocellulose to prepare fuel oil and decrease the environmental pollution caused by the massive consumption of fossil fuels.
研究领域:
能源科学
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催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2015
·
IF 4.494
Yue Shen,Jian-Kui Sun,Yu-Xuan Yi,Bo Wang,Feng Xu,Run-Cang Sun
A simple and effective route for the production of levulinic acid (LA) from cellulose has been developed in SO 3 H-functionalized ionic liquids. The effects of ionic liquid structures, reaction conditions and combination of metal chlorides with ILs on the yield of LA were investigated, where the highest yield of 39.4% was obtained for 120 min in the presence of 1-(4-sulfonic acid) butyl-3-methylimidazolium hydrogen sulphate ([BSMim]HSO 4 ) with addition of H 2 O. The catalytic activities of ionic liquids depended on the anions and decreased in the order: CF 3 SO 3 − > HSO 4 − > OAc − , which was in good agreement with their acidity order. The ILs play a dual solvent-acid role for the cellulose conversion into LA and exhibited favorable catalytic activity over four repeated runs.
研究领域:
化学工程
·
可再生能源
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemSusChem
·
2011
·Vol. 4
·期 11
·1578-1581
·
IF 6.325
Yao-Bing Huang,Jian-Jun Dai,Xiao-Jian Deng,Yan-Chao Qu,Qing-Xiang Guo,Yao Fu
Graphical Combo deal: An aqueous solution of levulinic acid (LA) and formic acid (FA) derived from biomass-based carbohydrates can be converted efficiently to pyrrolidines via a ruthenium catalyst without need for an energy-intensive separation of LA or an external H 2 source. The ruthenium catalyst combines two processes: decomposition of FA to H 2 and reductive amination of LA with an amine.
研究领域:
化学工程
·
催化
·
绿色化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2018
·
IF 4.908
Wanbing Gong,Chun Chen,Ruoyu Fan,Haimin Zhang,Guozhong Wang,Huijun Zhao
Transfer-hydrogenation (TH) has attracted great attention because it does not require the use of high pressure H 2 . In this work, we report a facile ultrasound-assisted impregnation method with the aid of carbothermal reduction property of activated carbon (AC) to synthesize AC supported copper catalyst (Cu/AC) for efficient TH of bio-derived unsaturated oxygenated compounds such as furfural (FAL) and levulinic acid (LA). In the presence of 2-propanol as the hydrogen donor, within 5 h under 200 °C, the resultant Cu/AC catalyst can convert FAL into 2-methylfuran (2-MF, a high-value fuel additive) with a superior selectivity of 91.6%. The Cu/AC catalyst can also covert LA into γ-valerolactone (GVL) with a high selectivity of 89.9% under 220 °C for 5 h. The superior TH catalytic performance of the Cu/AC catalyst could be attributed to the uniform size and well dispersed Cu nanoparticles supported on the high surface area AC with the suitable proportion of Cu 2+ , Cu 0 and Cu + . Cycling test results confirm the reusability of the Cu/AC catalyst. Additionally, the reported Cu/AC catalyst is cheap and massive producible, advantageous for large-scale conversion of bio-derived platforms to value-added chemicals and bio-fuels.
研究领域:
催化化学
·
可再生化学
·
绿色化学
✓ 已验证
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Yunfei Zhang,Xilun Wang,Yi Shen
The challenge in the electrochemical reduction of levulinic acid (LA) lies in designing highly selective, energy-efficient, and non-precious-metal electrocatalysts that minimize the competitive hydrogen evolution reaction during LA conversion. Herein, we reported a facile pulsed electrodeposition strategy to fabricate bimetallic electrocatalysts with different combinations of lead (Pb), indium (In), tin, and cadmium supported by free-standing carbon felts (CFs). The as-prepared bimetallic self-supporting electrodes were examined for the electrochemical hydrogenation (ECH) of LA. The resulting InPb/CF electrocatalysts showed superior performance among the bimetallic catalysts. In addition, it was demonstrated that the catalytic performance of bimetallic samples was better than that of the corresponding monometallic samples. Notably, the In 72.4 Pb 27.6 /CF exhibited the best performance for ECH of LA, leading to 86.1 % of LA conversion, 99.7 % of selectivity towards valeric acid and 60.8 % of Faradaic efficiency at −1.5 V vs RHE. The excellent performance is mainly attributed to the modification of the electronic structures by the ligand and strain effects. Meanwhile, the relatively high electrochemically active surface area and the low charge transfer resistance are also conducive to improving the catalytic performance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Yanlin Liu,Zhen Yu,Binbo Wang,Xiwei Xu,Hongzhi Feng,Pengyun Li,Jin Zhu,Songqi Ma
Covalent adaptable networks (CANs) endow thermosets with recyclability (reprocessability and degradability) and are expected to address the issues of environmental pollution and resource waste triggered by the extensive use of thermosets. However, the contradiction between high performance and rapid reprocessing has always existed and is difficult to be resolved. Here we used biomass-derived levulinic acid and amino acids as feedstocks to synthesize fully biobased or high biobased content dual dynamic networks constructed by in situ generated Schiff base and ester bond. High cross-link density and hydrogen bonding enabled CANs with a high glass transition temperature and mechanical properties even without rigid loops in the network. In addition, the dual dynamic exchange reactions of the autocatalyzed transesterification by in situ generated tertiary amines and the Schiff base exchange contributed rapid reprocessing without external catalysts to the CANs. Moreover, the Schiff base also endowed the CANs with controllable degradation properties under acidic conditions.
研究领域:
材料科学
·
环境科学
·
有机化学
✓ 已验证
DOI
高影响因子
Processes
·
2022
·Vol. 10
·期 4
·734
·
IF 3.352
Baoshi Dong,Haifeng Cong,Xingang Li,Hong Li,Xin Gao
Levulinic acid (LA), a platform chemical with high added value, can be obtained by deep hydrolysis of cellulose, but accompanied by the production of formic acid (FA). Due to its high water content, the recovery of levulinic acid and formic acid from aqueous solution consumes a lot of energy in industry. This paper will use the method of reactive extraction to explore the optimal conditions for the recovery of levulinic acid and formic acid from deep hydrolysate. First, the kinetic and thermodynamic parameters of the reaction process were studied. Then, the effects of different parameters, such as temperature, catalyst dosage, and raw material ratio, on the reaction extraction process were investigated. Finally, through the simulation and optimization of the process, the optimized recovery conditions were chosen to realize the recovery of formic acid and levulinic acid. It is found that reactive extraction can achieve the purpose of efficiently separating levulinic acid and formic acid from the aqueous solution by the yield of 99.1% and 99.9%, respectively.
研究领域:
化学工程
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环境科学
·
生物技术
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2016
·
IF 2.567
Jie Fu,XiuXiu Xu,Xilei Lu,Xiuyang Lu
The hydrothermal decomposition reactions of cellulose, glucose, and fructose were catalyzed by ionic liquids (ILs) to produce levulinic acid (LA). Among 18 types of ionic liquids with different anions, the ionic liquids containing haloids and hydrogen sulfates exhibited a universal activity for the conversion of fructose, glucose, and cellulose to produce LA. Reusability tests for [PrSO3HMIm]Cl and [BSO3HMIm]HSO4 were carried out and revealed that [BSO3HMIm]HSO4 can be used over four cycles without a loss of activity. The effects of reactant loading, ionic liquid loading, reaction temperature, and time on the decomposition of glucose and cellulose were investigated with [BSO3HMIm]HSO4. The optimum reaction conditions were obtained as a [BSO3HMIm]HSO4 loading of 0.5 g, a reactant loading of 0.05 g, a temperature of 180 °C, and a reaction time of 1 h. Yields of 60.8% from glucose and of 54.5% from cellulose were obtained for the catalysis with [BSO3HMIm]HSO4. Kinetics studies of the decomposition of glucose and cellulose were conducted. The rate constants at each temperature were obtained. For the decomposition of glucose, the activation energies for the conversion of glucose to LA and conversion of glucose to humins were determined as 121.1 ± 4.7 kJ/mol and 114.6 ± 6.1 kJ/mol, respectively. For the decomposition of cellulose, the activation energies for the conversion of cellulose to glucose, conversion of glucose to LA, and conversion of glucose to humins were determined as 186.8 ± 7.4 kJ/mol, 114.0 ± 2.7 kJ/mol, and 148.3 ± 11.2 kJ/mol, respectively.
研究领域:
生物化学
·
可再生资源工程
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2017
·
IF 3.33
Yanxiu Liu,Hu Li,Jian He,Wenfeng Zhao,Tingting Yang,Song Yang
A series of niobium-containing catalysts were prepared by hydrothermal synthesis method, and characterized by NH 3 -TPD, TEM, XRD, N 2 adsorption-desorption and pyridine-adsorption FT-IR techniques. Fe-NbP (Fe-doped niobium phosphate) with higher total acid density (3.59 mmol/g) and appropriate Brønsted/Lewis acid ratio (1.32) was found to show superior activity in production of levulinic acid (LA) from glucose, and a high LA yield of 64.2% was achieved at 180 °C in 3.0 h. The effect of various reaction parameters such as temperature, time, catalyst dosage, and substrate concentration on LA production has been investigated. The catalyst can be recycled for several times without significant loss of activity.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
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
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yong Liu,Canshuo Gu,Lungang Chen,Wenguang Zhou,Yuhe Liao,Chenguang Wang,Longlong Ma
Metal–oxide interaction was widely observed in supported metal catalysts, playing a significant role in tuning the catalytic performance. Here, we reported that the interaction of Ru and MnOx was able to facilitate the hydrodeoxygenation of levulinic acid (LA) to 2-butanol with a high turnover frequency (1.99 × 106 h–1), turnover number (4411), and yield (98.8%). Moreover, this catalyst was capable of removing the hydroxymethyl group of lactones and diol with high yields of products. The high activity of the Ru–MnOx catalyst was due to the strong Ru–MnOx interaction, which facilitated reduction of Ru oxide to Ru0 and Mn oxide to Mn2+. The increased fractions of Ru0 and Mn2+ provided metal and Lewis acid sites, respectively, and therefore facilitated LA hydrodeoxygenation. A linear correlation between the hydrodeoxygenation activity of the Ru–MnOx catalyst and [Mn2+]ln([Ru0]) was observed.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2023
·
IF 5.3
Kaifeng Lu,Yifan Wang,Lingjun Zhu,Bo Xing,Shurong Wang
The conversion of biomass-derived saccharides into platform chemicals is of immense importance for biorefineries. This study demonstrated the potential of using heteropoly acid as a catalyst in a green solvent system composed of γ-valerolactone and water for the production of levulinic acid from biomass-derived saccharides. The effects of heteropoly acids with different central heteroatoms (P and Si) and addendum atoms (W and Mo) on the catalytic conversion of glucose to levulinic acid in the γ-valerolactone–water system were studied. According to the experimental results, silicotungstic acid had the highest catalytic activity. In comparison to other catalysts, silicotungstic-acid-catalyzed glucose conversion could obtain the highest levulinic acid yield under the same reaction conditions, which was mainly attributed to the lower ratio of Brønsted/Lewis acid of silicotungstic acid. In optimal circumstances, 87.7% levulinic acid was obtained by glucose conversion at 190 °C and 60 min. Meanwhile, non-protonic polar solvent γ-valerolactone could promote the slight conversion of glucose to pentose, producing about 9% furfural. In addition, a kinetic model was established to further evaluate the reaction process of glucose conversion to levulinic acid and furfural. The green reaction system was also appropriate for other saccharides. In this study, a new approach could be provided to efficiently convert saccharides into platform chemicals.
研究领域:
生物化学
·
可再生资源与环境工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）