JOURNAL OF MEMBRANE SCIENCE
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2022
·
IF 10.53
Yaqi Wang,Tanlong Xue,Zhihao Si,Chang Liu,Shuai Yang,Guozhen Li,Yan Zhuang,Peiyong Qin
Recently, the preparation of polymeric membranes by UV-induced polymerization is encouraged due to the ultrafast curing and controllable operation. However, the long-period exposure under UV light has a great threat to both the environment and operators. Herein, we developed the visible-light-induced polymerized PDMS membrane for the pervaporative separation of furfural . The differences among photoinitiator ethyl(2,4,6-trimethylbenzoyl)phenylphosphinate (TPO-L), diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide (TPO) and 2-hydroxy-2-methylpropiophenone (1173) in the polymerization kinetics , membrane structure and separation performance are compared. Results show that the absorbance of TPO-L matches 405 nm of the visible light region; and it can be well dispersed and compatible with PDMS and obtain high initiation efficiency. Furthermore, the conditions including TPO-L concentration and PDMS viscosity are optimized, and the prepared membrane has an outstanding pervaporation performance containing 1299.5 g m −2 h −1 of total flux and 40.2 of furfural separation factor. Importantly, the ultrafast and continuous preparation process of membrane is operated by a home-made machine, indicating the wonderful potential for its large-scale application.
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DOI
高影响因子
RSC Advances
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2022
·Vol. 12
·期 19
·11843-11852
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IF 4.036
Qi Guo,Xinglong Hou,Wei Xu,Junli Liu
Ni3Co1/ELAC catalyst, prepared by the enzymatically hydrolyzed lignin activated carbon as a carrier and a 3 : 1 ratio content of nickel and cobalt, can selectively convert furfural to cyclopentanol (CPL) in aqueous solution. We used activated carbon prepared by the phosphoric acid method as the carrier, and investigated the effect of the carrier on the catalyst activity. The ratio of bimetal (Ni, Co) content and reaction conditions (reaction temperature, reaction time, initial H2 pressure) have also been investigated in the furfural hydrogenation. With the optimal Ni3Co1/ELAC catalyst, the conversion rate of furfural and the selectivity of CPL were 100% and 94.1%, respectively. In this process, some important catalysts were studied by XRD, XPS, ICP-AES, BET and TEM characterization. Through experimental results and other people's research, we deduced a reasonable reaction path and verified it by replacing the reaction substrate and solvents. Finally, the experiment proved that the formation of CPL by furfural required the occurrence of a rearrangement reaction and the participation of aqueous solution.
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PubMed
高影响因子
FUEL
·
2022
·
IF 8.035
Bin Hu,An-shuai Cheng,Wen-luan Xie,Ji Liu,Yao-bing Huang,Ling-jun Zhu,Bing Zhang,Ming-xiao Li,Li Zhao,Ti-peng Wang,Qiang Lu
Pyrolysis is a promising thermal conversion technique of biomass to tackle the energy crisis and environmental pollution. Furfural (FF) is an important pyrolysis product from biomass-based materials and a crucial platform compound for energy and fuels. In the present study, we developed a new and green approach to selectively produce FF through the oxalic acid-assisted fast pyrolysis (OAFP) of corncob (CC). The FF yield was up to 16.5 wt% (based on raw CC) through the fast pyrolysis of the solid mixture of CC and OA with a ratio of 1:4 (CC/OA) at 400 °C during the micro-pyrolysis coupled with online-detection experiments. The corresponding FF selectivity was 56.5% (based on raw CC). Under similar experimental parameters, a yield of 10.0 wt% (based on raw CC) was achieved with a lab-scale setup. Experiment and density functional theory (DFT) calculation results suggested that OA played a catalyst-like role in the selective formation of FF from hemicellulose (mainly xylose units) of CC and meanwhile decomposed during the pyrolysis process. The formic acid (FA) decomposed from OA had a similar but lighter effect than OA. With the assistance of OA, the energy barriers of the FF formation reactions decrease dramatically and the competitiveness of the pathways is also altered, which contributes a lot to the FF selective generation. FF is mainly generated in a chain propagation pattern from the acyclic reducing end and unsaturated (C4 C5 bond) non-reducing end of the xylan chain.
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高影响因子
CATALYSIS LETTERS
·
2022
·Vol. 152
·期 12
·3537-3547
·
IF 2.936
Liu Zonghui,Zhang Zhongze,Wen Zhe,Xue Bing
Development of simple and high performance solid catalysts for the utilization of biomass has become an important research topic in heterogeneous catalysis and sustainable chemistry. Herein, a highly efficient catalytic system was studied for the catalytic transfer hydrogenation of furfural to high value furfuryl alcohol over a series of acidic or basic oxides catalysts. Among those oxides, acidic Al 2 O 3 is identified as the most effective for FAL production, giving a FUR conversion as high as 40% (FUR consumption rate was 186 mmol g cat −1 h −1 ) and FAL selectivity of 99% after only 5 min at 150 °C using 2-propanol as the H-donor and solvent. Furthermore, the as prepared Al 2 O 3 give an Ea value of 15.2 kJ/mol, which is much lower than other complex catalysts in the literatures. Correlating the catalyst performance with its physical and chemical properties uncovers that the large specific surface area and high acidity of Al 2 O 3 would be the key to the catalyst performance. Graphical Abstract
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高影响因子
Molecular Catalysis
·
2021
·
IF 5.062
Qian Wang,Jie Zhang,Wenlong Jia,Xin Yu,Jiahong Chen,Yong Sun,Zuojun Wei,Shuliang Yang,Xing Tang,Xianhai Zeng,Lu Lin
Generally, 5-hydroxymethylfurfural (HMF) is used as feedstock to produce 2,5-furandicarboxylic acid (FDCA). Whereas, its poor stability in alkaline environment results in low yield of FDCA. By contrast, 5-[(formyloxy)methyl]furfural (FMF), a novel platform compound derived from HMF, with higher thermal and alkaline stability than HMF, is more promising to replace HMF as substrate for the production of FDCA. In this study, FMF was successfully converted into FDCA over MoCuO x by using NaClO as oxidant, undergoing 2,5-diformylfuran (DFF) and 5-hydroxymethylfuran-2-carboxylic acid (HMFCA) as intermediates. Under optimization condition (30 min, 40 °C), 100% yield of FDCA was obtained. Furthermore, it was also demonstrated that the yield of FDCA up to 90% was gained in 5 wt % FMF concentration. Higher oxygen species mobility and lattice oxygen ratio endowed MoCuO x excellent catalytic activity. The synergy of Mo and Cu species in MoCuO x ensured an efficient conversion of HMF to FDCA through synergistic redox couple of Mo 6+ /Mo 5+ and Cu 2+ /Cu + .
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高影响因子
Energy Science & Engineering
·
2019
·Vol. 7
·期 5
·2237-2246
·
IF 2.893
Yuan Zhao,Hao Xu,Kaifeng Lu,Yang Qu,Lingjun Zhu,Shurong Wang
In this study, the most abundant C5 carbohydrate unit in biomass, namely xylose, was chosen as the feedstock, and its hydrothermal conversion for furfural production was carried out in a green and renewable solvent system composed of water and butanone, in order to study the role of FeCl 3 and [bmim]Cl of ionic liquid catalyst in the conversion process of xylose. A key intermediate named xylulose from Lewis acid-catalyzed xylose isomerization was quantified. It was concluded that appropriate content of FeCl 3 and [bmim]Cl favored the isomerization-dehydration reaction path along which xylose was converted into furfural, while excessive amount of either component would result in side reactions leading to furfural consumption at long reaction times. By comparison between ionic liquid catalysts that had different active metal sites, xylose conversion and furfural yields were found to increase when the Lewis acidity of the metal ions became stronger. Moreover, chlorometallate anions with better catalytic performance than the original neutral salts were formed during catalyst preparation, and in this way, the xylose conversion and furfural formation were further promoted. Finally, the optimized ionic liquid catalyst produced a highest furfural yield of 75% and xylose conversion of 99% at 140°C.
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高影响因子
CATALYSIS COMMUNICATIONS
·
2019
·
IF 3.674
Qianhe Liu,Qing Liu,Xun Hu
Successive hydrogenation of furfural in two fixed-bed reactors connected in tandem with Cu/SiO 2 and Ni/SiO 2 as the catalysts was achieved under atmospheric pressure. Various targeting products including furfuryl alcohol (yield: 98.8%), 2-methylfuran (yield: 95.1%), 2-methyltetrahydrofuran (yield: 96.2%) and tetrahydrofurfuryl alcohol (yield: 78.2%) could be obtained by variation of the reactor configurations.
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高影响因子
CATALYSIS LETTERS
·
2019
·Vol. 150
·期 4
·1121-1127
·
IF 2.372
Xu Siquan,Wu Ningxin,Yuan Hui,Chen Yuan,Pan Donghui,Wu Yuanfeng,Fan Jingdeng,Gao Lijing,Xiao Guomin
Abstract Silica-supported hafinum phosphide (HfP/SiO 2 ) was prepared and applied as an effective solid acid catalyst to drive furfural production from xylan. Various characterizations were employed to analyze the intrinsic properties of the HfP/SiO 2 catalyst, and the effects of process parameters on its performance were investigated in detail. The results showed that the performance of the HfP/SiO 2 catalyst was excellent, which allowed up to 85% of the furfural yield to be achieved at 180 °C for 60 min in the water (NaCl) /THF biphasic system. There was no significant decrease in the performance of the HfP/SiO 2 catalyst after seven consecutive cycles. Characterization analysis of the recovered catalyst revealed that its elemental composition and total acidity were maintained, indicating the desired hydrothermal stability of the HfP/SiO 2 catalyst. In addition, by-products produced during xylan conversion were identified as humins and soluble molecular fragments or polymers. Graphic Abstract
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高影响因子
MOLECULES
·
2025
·Vol. 30
·期 2
·225
·
IF 4.6
Jieqiong Wang,Jingyi Yang,Zezheng Bing,Yuanyuan Gao,Tao Yang,Qiaoyun Liu,Meng Zhang,Zhongyi Liu
Controllable hydrogenation of carbonyl groups (C=O) is crucial for converting furfural into high-value furfuryl alcohol. Instead of traditional impregnation method, a novel Cu-based catalyst (Cu/SiO2) is prepared using the ammonia evaporation method (AE) for the efficient hydrogenation of furfural to furfuryl alcohol under mild conditions. At the reaction conditions of 90 °C and 1 MPa H2, the 5Cu/SiO2-AE sample showed optimal performance with higher turnover frequency (36.0 h−1) and furfuryl alcohol selectivity (>99.9%). After five cycles, the catalyst recycled still showed a high reaction activity and selectivity for furfuryl alcohol. Characterization results such as XRD, H2-TPR, FT-IR, and XPS showed that the excellent catalytic performance of 5Cu/SiO2-AE catalyst was attributed to the formation of layered copper silicate and the high dispersion of Cu species. Furthermore, the formation of layered copper silicate resulted in a higher ratio of Cu+/(Cu0+Cu+) at a reduction temperature of 250 °C, which was also responsible for the optimum activity. This work showed the importance of controllable synthesis of layered copper silicate in improving the catalytic performance of copper-containing catalyst.
研究领域:
催化化学
·
材料科学
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PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Chenghu Zhang,Yanbin Zhang,Ying Li,Tong Xu,Yinghui Sun,Jie Bai
The hydrogenation reaction can effectively promote the upgrading of biomass-derived resources into high value-added products. Currently, constructing metal Pd-based catalysts is one of the effective strategies to promote hydrogenation reactions. In this paper, Pd-ZrO 2 catalyst was prepared through electrospinning technology using PdCl 2 -Zr(acac) 4 /PVP as a precursor for furfural hydrogenation reaction. The results revealed that the obtained Pd-ZrO 2 catalyst could provide 70 % furfural conversion and 76.2 % furfuryl alcohol selectivity at 170 ℃ and 2 MPa 5 % H 2 /Ar for 12 h. At the same time, nearly complete FAL conversion with 92.9 % FOL selectivity could be achieved under 2 MPa N 2 for 12 h in the process of catalytic transfer hydrogenation. In addition, the effects of conditions such as reaction temperature, reaction time, and solvent on the two hydrogenation paths were further evaluated. The cycle test proved that the catalyst can be recycled multiple times without significant decrease in catalytic activity.
研究领域:
催化化学
·
生物质能
·
材料科学
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高影响因子
CARBOHYDRATE POLYMERS
·
2015
·
IF 4.074
Huiling Li,Qingqing Dai,Junli Ren,Longfei Jian,Feng Peng,Runcang Sun,Guoliang Liu
In the present study, a graded ethanol precipitation technique was employed to obtain hemicelluloses from the alkali-extracted corncob liquid. The relationship between the structural characteristics of alkali-soluble corncob hemicelluloses and the production of furfural was investigated by a heterogeneous process in a biphasic system. Results showed that alkali-soluble corncob hemicelluloses mainly consisted of glucuronoarabinoxylans and l -arabino-(4- O -methylglucurono)- d -xylans, and the drying way had less influence on the sugar composition, molecular weights and the functional groups of hemicelluloses obtained by the different ethanol concentration precipitation except for the thermal property, the amorphous structure and the ability for the furfural production. Furthermore, alkali-soluble corncob hemicelluloses with higher xylose content, lower branch degree, higher polydispersity and crystallinity contributed to the furfural production. A highest furfural yield of 45.41% with the xylose conversion efficiency of 99.06% and the furfural selectivity of 45.84% was obtained from the oven-dried hemicelluloses precipitated at the 30% (v/v) ethanol concentration.
研究领域:
生物化学
·
可再生资源与环境科学
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PubMed
高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Yuhui Huang,Yehan Tao,Qingqing Wang,Jian Du,Jinwen Hu,Jie Lu,Yanna Lv,Haisong Wang
To develop an industrial zeolite-based catalyst for efficient furfural production, the acidity, pore structure, and electronic properties of H-β zeolite were modulated by synergistic deatomization and atomic implantation treatments. The dealumination effectively decreased the intrinsic aluminum-related Lewis and Brosted acid sites, thus decreasing the occurrence of unwanted side reactions. Meanwhile, the removed skeleton aluminum can create voids for the following atomic implantation of introducing higher valent-state niobium species, which would provide new kinds of catalytic active sites, increase the average pore size by distorting the zeolite skeleton, and enhance the interaction with reactant molecules by acting as more electron deficient centers. In a single-phase water/γ-valerolactone reaction system, the optimum catalyst can efficiently convert both xylan and xylose with a conversion of 100 % at a medium temperature of 130 ℃ within 3 hours. Compared with the furfural yield over untreated H-β (12.7%), the yield over deAlβ/Nb(20%) catalyst was greatly enhanced by 54% with xylose as raw material. The catalyst can be recovered by simple cleaning and thermal regeneration and then reused. The proposed post-treatment strategy could maintain the integrity of the zeolite structure, ensure uniform and stable metal dispersion under harsh conditions, manage the complexity and cost of the preparation process, and most importantly, optimize the catalytic performance. Addressing these issues is essential for improving the efficiency and practical application of industrial zeolite catalysts by this general approach and benefiting industrial furfural production.
研究领域:
化学工程
·
催化材料
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高影响因子
危险品化学品经营许可证（带存储）