FUEL PROCESSING TECHNOLOGY
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2022
·
IF 8.129
Kun Yuan,Huangxian Zhang,Qiao Sun,Xiaohua Zhang,Dan Hou,Jing Chen,Changxiang Liu,Jinzhu Chen,Wanming Xiong
Biomass-based platform compound furfural can be upgraded to C 10 furoin, which is significant to the development and utilization of biomass energy . In this work, a series of diimidazole ILs were applied to explore a feasible way for upgrading of furfural to furoin. The results showed that the catalytic performance of diimidazole ILs were affected by the solvent and the structure of the anion and cation . Furoin yield could increase from 14.8% to 45.0% with the extension of the side chain, and it could be greatly enhanced by the transformation of ethyl group into unsaturated vinyl group. Theoretical calculations revealed it was due to the higher absorption energy and shorter distance between the di (vinylimidazole) ILs and furfural. Furthermore, the anion of diimidazole ILs also displayed influence by affecting the acidity and the electron distribution on the imidazole ring. Finally, the optimized yields of 84.4%, 82.0% and 84.8% were obtained by optimizing the BV 4 , FV 4 and SV 4 catalytic systems , respectively. Mechanistic studies suggested that C-2 deprotonation was the key to the reaction, and both the σ hyperconjugation and π-π conjugation with the imidazole ring could facilitated the reaction. This work may provide some reference in upgrading biomass energy
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Materials Today Communications
·
2024
·
IF 3.7
Jin Liu,Daixuan Yang,Qilin Yue,Min Wu,Shijie Sun,Xiuyun Li,Guanjun Chang,Yong Wei
The poly(ionic liquids) (PILs) are often considered to own good stability and frequently adopted to design liquid-free ionic conductive materials , yet the environmental reliability that determines the stability of PILs has not been experimentally demonstrated. Here, three PIL ionoadhesives including homopolymer , copolymer and chemically crosslinked copolymer are fabricated and their environmental reliability has been studied through aging treatment under high temperature and high humidity. It is discovered that the bonding strength of PIL ionoadhesives drastically dropped by a sharp percentage (34.9–52.0 %) in the first 24 h and maintained stable in the following aging period. The investigation to the failure mechanism reveals the environmental reliability of PIL ionoadhesives is seriously destroyed by humidity due to the strong interactions between water molecules and ionic groups of PIL ionoadhesives, resulting in shielding of ionic groups that weakens the non-covalent interactions among PIL chains and the interfacial interactions between PIL ionoadhesives and substrates. This work reveals the environmental reliability of PILs and figures out the failure mechanism, which may provide a useful insight for further design of PIL materials.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Tingting Xiao,Chen Tan,Gary Histand,Dongen Lin
Latent imidazolium phosphinate ionic liquids (IMPILs) with innovative structures were developed as high-performance curing agents for one-component epoxy systems. These room-temperature liquid IMPILs exhibit exceptional compatibility with liquid epoxy resin (EP, E-51), overcoming the immiscibility limitations of conventional curing agents. These IMPILs efficiently cure EP (E-51) at moderate temperatures (109–180 °C) in the mass ratio range of 100:10–100:15, while maintaining storage stability with a 15-day pot life at 25 °C. The cured thermosets achieve impressive overall performance: tensile strength of 88 MPa (surpassing thermosets cured with 1-methylimidazole or 1,2-dimethylimidazole), good thermal stability (T10% = 374–407 °C), and unexpected flame retardancy (LOI = 30.7–35.1%, surpassing standard epoxy resins). This work establishes IMPILs as a novel class of liquid latent curing agents that satisfy both long-term storage requirements and excellent thermal-curing performance for advanced epoxy composites.
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POLYMER
·
2014
·
IF 3.766
Heng Zhang,Li Li,Wenfang Feng,Zhibin Zhou,Jin Nie
A new family of polymeric ionic liquids (PILs) based on alkyl and alkyl ether substituted ammoniums and perfluorinated sulfonimides (i.e., bis(fluorosulfonyl)imide (FSI − ), and bis(trifluoromethanesulfonyl)imide (TFSI − )) have been synthesized by polymerization of the corresponding ionic liquid monomers (ILMs). Their structures and compositions have been characterized by 1 H and 19 F NMR, FTIR and viscosity-average molecular weight ( M v ). The physicochemical properties of both the ILMs and the PILs have been studied in terms of thermal stability, phase transition, and ionic conductivity . All the prepared ILMs and PILs reveal excellent thermal stabilities to greater than 250 °C. The PILs containing alkyl ether side unit show significant decrease in glass transition temperature ( T g ), the values of T g of the alkyl ether based-PILs are all significantly lower by 10–77 °C in magnitude than those of the corresponding alkyl based ones. The ionic conductivity of alkyl ether based-PILs in the best case increases up to 4.0 × 10 −6 S cm −1 at 30 °C, and reaches 7.6 × 10 −5 S cm −1 at 60 °C, and outperform their ammonium counterparts with alkyl side chain that were synthesized as references.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2016
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IF 2.567
Xuan Zhang,Rui Zhang,Haiyan Liu,Xianghai Meng,Chunming Xu,Zhichang Liu,Peter A. A. Klusener
Pyridine can act as a basic indicator for both Brønsted and Lewis acids forming different types of bonds. Infrared spectroscopy, in combination with 27Al NMR spectroscopy, was employed to study the interaction mechanism of pyridine and chloroaluminate ionic liquids (ILs). The acid type, acid amount, acidity, and even activity of chloroaluminate ILs could be determined. An in situ infrared complexometric titration was developed as a quantitative characterization method for determining the different acidities and catalyst activity. The method is based on the principle that Lewis acidic chloroaluminate [Al2Cl7]− anion reacts with pyridine to form the [AlCl4]− anion and pyridine–AlCl3 ([PyAlCl3]) complexes, while the Brønsted acid forms a pyridinium salt. Both product types showed characteristic shifts of the pyridine peaks in the infrared spectrum.
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MOLECULES
·
2017
·Vol. 22
·期 8
·1353
·
IF 2.861
Jianliang Sun,Hao Liu,Wenping Yang,Shicheng Chen,Shiyu Fu
Water-miscible alkylimidazolium ionic liquids (ILs) are “green” co-solvents for laccase catalysis, but generally inhibit enzyme activity. Here, we present novel insights into inhibition mechanisms by a combination of enzyme kinetics analysis and molecular simulation. Alkylimidazolium cations competitively bound to the TICu active pocket in the laccase through hydrophobic interactions. Cations with shorter alkyl chains (C2~C6) entered the channel inside the pocket, exhibiting a high compatibility with laccase (competitive inhibition constant Kic= 3.36~3.83 mM). Under the same conditions, [Omim]Cl (Kic= 2.15 mM) and [Dmim]Cl (Kic= 0.18 mM) with longer alkyl chains bound with Leu296 or Leu297 near the pocket edge and Leu429 around TICu, which resulted in stronger inhibition. Complexation with alkylimidazolium cations shifted the pH optima of laccase to the right by 0.5 unit, and might, thereby, lead to invalidation of the Hofmeister series of anions. EtSO4−showed higher biocompatibility than did Ac−or Cl−, probably due to its binding near the TICu and its hindering the entry of alkylimidazolium cations. In addition, all tested ILs accelerated the scavenging of 2, 2′-azino-bis-(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) radicals, which, however, did not play a determining role in the inhibition of laccase.Keywords:ionic liquids (ILs);laccase;alkylimidazolium cations;competitive binding;kinetics;Hofmeister effects;molecular simulation
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高影响因子
JOURNAL OF SURFACTANTS AND DETERGENTS
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2015
·Vol. 18
·期 3
·421-428
·
IF 1.685
Xu Wenwen,Zhang Qian,Wei Hongtu,Qin Jieqiong,Yu Li
The self-aggregation behavior of catanionic surface active ionic liquids (SAIL), 1-alkyl-3-methylimidazolium alkyl sulfates, [C 4 mim][C 16 SO 4 ] and [C 6 mim][C 14 SO 4 ], in aqueous solutions was explored by several techniques. These results were analyzed together with the concerning data of [C 8 mim][C 12 SO 4 ] reported previously. The feature of these SAIL is that the total carbon number of the hydrophobic chains is kept constant, while only the length of the two hydrocarbon chains varies. Because of the different intermolecular and intramolecular interactions, the hydrophobic interaction of asymmetrical SAIL is enhanced, which explains the minimal CMC value of [C 4 mim][C 16 SO 4 ]. Thermal motion of hydrocarbon chains at the air–water interface leads to higher A
min and lower Γ max values with the increasing asymmetry of two hydrophobic chains. The conductivity measurements reveal that the micellization process is spontaneous and entropy-driven in the studied temperature range. This work indicates that the symmetry of alkyl chains can influence the aggregation behavior of [C
n
mim][C
m
SO 4 ] in aqueous solutions.
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GREEN CHEMISTRY
·
2016
·Vol. 18
·期 23
·6246-6254
·
IF 8.506
Yan-Rong Liu,Kaj Thomsen,Yi Nie,Suo-Jiang Zhang,Anne S. Meyer
In this work, 357 ionic liquids (ILs) formed from 17 cations and 21 anions were selected for evaluation of their ability to dissolve cellulose by COSMO-RS. In order to evaluate the predictive model and method, experimental measurements of the solubility of microcrystalline cellulose (MCC) in 7 of these ILs were also conducted. Predicted results from logarithmic activity coefficients were generally in good agreement with the experimental results. Three different models were used for describing cellulose, and the mid-monomer part of the cellotriose model was found to be closer to the experimental results than a neat glucose model and the model of the mid-dimer part of cellotetraose. Excess enthalpy calculations indicated that hydrogen-bond (H-bond) interactions between cellulose (i.e. the three cellulose models) and the 7 studied ILs are key factors for the solubility of cellulose, and the anions play a crucial role in the cellulose dissolution process. Importantly, the cations of methylimidazolium+, pyridinium+, ethylmorpholinium+ and methylpyrrolidinium+ structured with functional groups including ethyl, allyl, 2-hydroxylethyl, 2-methoxyethyl and acryloyloxypropyl, combined with anions Ac−, Dec−, HCOO−, Cl−, BEN−, DMPO4−, DEP−, DBP− and Br− were predicted to be the best for dissolving cellulose.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2015
·
IF 2.037
Fufeng Cai,Wei Zhu,Yanbin Wang,Tongzhen Wang,Guomin Xiao
In this work, the ability of ionic liquids (ILs) 1,3-dimethylimidazolium dimethylphosphate ([MMIM][DMP]), 1-ethyl-3-methylimidazolium diethylphosphate ([EMIM][DEP]), and 1-butyl-3-methylimidazolium dibutylphosphate ([BMIM][DBP]) as alternative solvents used in liquid removal of toluene from its combination with heptane was studied. The liquid–liquid equilibrium (LLE) data in relation to ternary systems {toluene + heptane + [MMIM][DMP], [EMIM][DEP], or [BMIM][DBP]} calibrated at T = 298.2 K and atmospheric pressure. The LLE results studied in relation to ternary systems were fitted by the thermodynamic nonrandom two-liquid (NRTL) model. The toluene solute distribution ratios and toluene/heptane selectivities, derived from the experimental LLE data, were compiled and analyzed to determine the extraction capacity of the studied ILs.
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CANADIAN JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 1.6
Ping Xie,Tianhao Zhong,Tao Li,Yiwu Lu,Yingmin Yu,Qingshan Zhao,Zhongtao Li
There is an urgent need to develop green catalytic transesterification technology to reduce liquid waste and instrument corrosion. Ionic liquids with controlled activity, easy recovery, and corrosion resistance have great potential as catalysts for transesterification reactions. In this paper, a series of ionic liquids were prepared using imidazole and ammonium compounds as cations, and sulphuric acid, p -toluenesulfonate, and bistrifluoromethanesulfonate anions as anions. In comparison, the ionic liquid made from imidazole with H 2 SO 4 (IMIHS) was found to be the best catalyst for the esterification reaction with high speed, high activity, low corrosion, and high stability, and its catalytic performance was superior to that of sulphuric acid. The optimum reaction conditions were as follows: the molar ratio of ethanol to acetic acid was 1:1, the catalyst amount was 5 wt.%, the reaction temperature was 80°C, and the reaction time was 120 min. The maximum yield of ethyl acetate was 66.2% under the optimum reaction conditions. The catalytic activity was not declined obviously by reusing six times. The activation energy of the reaction is 48.748 kJ/mol.
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INDUSTRIAL LUBRICATION AND TRIBOLOGY
·
2024
·Vol. 76
·期 6
·842-851
·
IF 1.5
Long Sun,Chengjie Jin,Xiaodong Tang,Kexin Cao,Songquan Wang,Ningning Hu
PurposeThe purpose of this paper is to solve the abrupt deterioration of lubricant performance in high-temperature conditions.Design/methodology/approachThree silver pyrazolyl methyl pyridine complexes with different morphologies were synthesized. A four-ball tribometer was used to assess the tribological characteristics as an additive for pentaerythritol oleate both independently and compound with 1-hexyl-3-methylimidazolium bis(trifluoromethane sulfonyl)imide.FindingsThe results showed that when silver complexes and ionic liquids (IL) act independently, sheet silver complex 1 and rod silver complex 2 exhibit good lubricating performance; the optimal antifriction concentration of the ILs is 0.25 Wt.%. The tribological results of the compounds additive of ILs and silver complexes indicate that the wear scar diameter of compound 1 decreased by 16.914%, the wear volume reduced by 7.44% and the lubrication effect surpassed that of the two substances individually; rod compound 2 exhibited an antagonistic effect, intensifying wear; compound 3’s lubrication effect fell between that of the two individual components.Originality/valueThe compound of sheet silver complexes and ILs effectively solves the agglomeration problem of micro/nano lubricant additives. When the interface fails, self-repair is completed, improving the stability and antiwear performance of the lubricating oil.Peer reviewThe peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-04-2024-0128
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SENSORS AND ACTUATORS B-CHEMICAL
·
2026
·
IF 8.3
Wenyue Du,Rongcai Jia,Liang Guo,Yanlu Yang
Accurate and rapid ammonia detection is critical for environmental monitoring and clinical diagnosis of chronic kidney disease. Herein, a highly sensitive room-temperature ionic liquid (RTIL) in electrochemical ammonia sensor based on a Pt-Ru electrode was developed for detecting ammonia concentrations ranging from 0 to 100 ppm. To achieve prolonged operational life and stability, 1-(2-hydroxyethyl)-3-methylimidazolium tetrafluoroborate ([HOETMIM][BF 4 ]) was utilized as the electrolyte. Nickel cobaltite (NiCo 2 O 4 ) and γ-MnO 2 were synthesized separately via hydrothermal methods. The effects of modified ionic liquids on the sensor’s performance were investigated by incorporating different mass fractions of NiCo 2 O 4 and γ-MnO 2 . Comprehensive analyses, including X-ray diffraction (XRD), scanning electron microscopy (SEM), Mapping, energy-dispersive spectroscopy (EDS), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS), confirmed the successful and rational synthesis of the samples. The ammonia sensing performance of the ILs/NiCo 2 O 4 /γ-MnO 2 sensor was studied at room temperature (25°C) using constant potential polarization (it) and electrochemical impedance spectroscopy (EIS) techniques. The testing data demonstrated that the optimized ILs/NiCo 2 O 4 /γ-MnO 2 sensor(5 wt% composite, 1:1 mass ratio) exhibited good sensitivity of 0.10 ± 0.02 μA/ppm, a limit of detection(LOD) of 1 ± 0.2 ppm, and a limit of quantification(LOQ) of 3 ± 0.5 ppm. The response and recovery times show clear difference among different sysrems: pure IL system exhibited 510 s/530 s, 5 wt% composite modified system achieved 12.22 s/3.6 s, and the fastest recorded values in batch tests were 17 s/14.5 s. Compared to traditional ionic liquid sensors, the ILs/NiCo 2 O 4 /γ-MnO 2 sensor demonstrated a significant improvement in ammonia sensing performance, with a selectivity ratio > 10 against common interfering gases.
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