CARBOHYDRATE RESEARCH
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2012
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IF 2.332
Xingcui Guo,Quan Cao,Yijun Jiang,Jing Guan,Xiaoyan Wang,Xindong Mu
Mesoporous SBA-15 materials functionalized with propylsulfonic acid groups (SBA-15-SO 3 H) were synthesized through a conventional one-pot route. It was used as a catalyst for the selective synthesis of 5-hydroxymethylfurfural (HMF) from the dehydration of fructose using BmimCl as solvent. Reaction time, temperature and fructose concentration were investigated during the HMF synthesis procedure. The catalyst SBA-15-SO 3 H exhibits high fructose conversion (near 100%) and HMF selectivity (about 81%) with good stability in the HMF synthesis. It was a suitable catalyst to produce HMF from renewable carbohydrates in potential industrial process.
研究领域:
化学工程
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催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NORDIC PULP & PAPER RESEARCH JOURNAL
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2019
·Vol. 34
·期 4
·495-506
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IF 0.929
Mingfu Li,Douyong Min,Xing Long,Qiyuan Tu,Kelei Zhang,Shuangfei Wang,Lianxin Luo
Ionic liquids (IL) of 1-butyl-3-methylimidazolium chloride (BmimCl) homogeneously mixed with bleached kraft pulp (BKP) were used to investigate the change of paper properties and refining performance under the general conditions. Fiber morphology and paper strength were determined by fiber analyzer and paper physical property tester. The surface morphology and chemical properties of fiber was also performed by scanning electron microscope (SEM), X-ray Diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The results indicated the optimized conditions of BmimCl pretreatment were BmimCl dosage of 1.5 mL/g, the time and temperature of 30 min and 80 °C, respectively. The physical properties of paper and internal bond strength of fiber was improved by BmimCl pretreatment. BmimCl pretreatment facilitated swelling and fibrillation of fiber, increased the crystalline index of fiber and decreased the lignin and extractives on the surface of fiber, which leading to improve fiber strength and tensile strength. For the same refining energy input, saving the maximum refining energy consumption was 14.0 % after BmimCl pretreatment, which is beneficial to improve the application of ionic liquid in pulp and papermaking.
研究领域:
制浆造纸工程
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材料科学
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化学工程
✓ 已验证
DOI
高影响因子
FOOD CONTROL
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2024
·
IF 5.6
Ning Li,Chang Liu,Li Niu,Xu Li,Jacko Feng,Zhiming Liu
In this study, we introduced an innovative method by incorporating 1-butyl-3-methylimidazolium chloride (BmimCl) as a versatile component and fine-tuning the mixture of chitosan, BmimCl, and cyanidin cation (Anth) to create pH-responsive smart films for food freshness. Owing to the dual functionality of BmimCl, it served as a plasticizer as well as enhanced the film’s capacity to display a broader spectrum of visible color changes. The material properties of chitosan films containing BmimCl and Anth at varying concentrations were characterized using FTIR, XRD, mechanical test, TGA, UV-vis and pH sensitivity. The combined results indicate that the chitosan-based pH-responsive smart film possessed excellent mechanical properties, great thermal stability, high light transmission, and a broad pH sensitivity. pH-responsive films were used for real-time freshness monitoring of freshwater shrimps, sterilized milk, and hairtails. Results revealed that BmimCl disrupts the hydrogen bond network of chitosan molecules. The films exhibit a transition from green to red as the food turns from fresh to spoiled, effectively demonstrating their capability to monitor freshness.
研究领域:
食品科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 39
·e202301413
·
IF 2.1
Tingting Chen,Yingjie Xu
Graphical A strategy to improve CO 2 capture of AmimCl-TEG DESs is proposed, that is addition of equimolar DBU to DESs, then H-bonds between DBU and O−H of TEG cause TEG to deprotonate to anion and react with CO 2 , and the CO 2 absorption capacity by DESs-DBU is up to 2.94 mol kg −1 and is 11 times that of pure DESs, and the interaction of DESs with CO 2 changes from physisorption to chemisorption. Microstructure of deep eutectic solvents (DESs) based on EmimCl or BmimCl ionic liquid (IL) and triethylene glycol (TEG) was studied by FT-IR spectra. The influence of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) on CO 2 absorption behavior and mechanism of DESs was investigated. FT-IR spectra of pure EmimCl-TEG and BmimCl-TEG DESs show that O−H⋅⋅⋅Cl − hydrogen bond interaction formed by IL and TEG gradually strengths with the increase in the molar ratio of IL to TEG, resulting in a corresponding increase in viscosity. Due to the lack of a chemical interaction site, the CO 2 absorption capacity of pure DESs at 313.2 K and 1.0 bar is only between 0.15 and 0.56 mol kg −1 . Surprisingly, the addition of equimolar DBU to DESs can significantly improve the CO 2 absorption capacity, which is up to 2.94 mol kg −1 at the maximum and similar to that of amine-functionalized DESs. CO 2 absorption mechanism characterized by FT-IR spectra indicates that DBU can form hydrogen bond with O−H of TEG, which leads to deprotonation of O−H of TEG into basic anion under the synergistic effect of O−H⋅⋅⋅Cl − hydrogen bond to achieve efficient CO 2 chemisorption via carbonate formation. The obtained results provide a strategy for effectively improving the CO 2 capture capacity of EmimCl-TEG and BmimCl-TEG DESs.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yi-Ran Du,Yi-Yu Tao,Jing-Wen Sun,Han-Sheng Li,Rui Zhang,Bao-Hua Xu
Despite great progress on the heterogeneous catalytic methoxycarbonylation of alkenes, the research on long-chain substrates is yet undeveloped. In this study, an efficient protocol was built by introducing 1-butyl-3-methylimidazole chloride (BmimCl) additive to the catalytic system of ceria-supported Ru clusters (Ru-CeO 2 ), providing the aliphatic esters with yields over 80 %. Experimental results combined mechanism studies demonstrated that the adsorption of chloride ion at oxygen vacancy (Vö) of CeO 2 during the catalysis delivered surfaces with reduced local concentration of Vö and electron-richer Ru sites. The synergistic effect between Vö and chloride ion boosted methanol (CH 3 OH) dissociation, providing higher coverage of dissociated CH 3 O species with lower adsorption energy and thereby accelerating the rate-limiting step of methoxycarbonylation. Importantly, the β-H elimination for competitive isomerization process was greatly inhibited on the electron-richer Ru sites. Meanwhile, the side hydrogenation was further suppressed by the restrained freedom of adsorbed H at such surfaces. These positive effects jointly offer a heterogeneous catalytic system of both efficient and selective on the challenging long-chain alkene substrates, taking methyl-4-pentenoate and chain alkenes with 6, 8, 10 and 12 carbon atoms as examples.
研究领域:
多相催化
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有机合成
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表面化学
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材料科学
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化学反应工程
✓ 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）