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  • Functionalized ionic liquid membranes for CO2 separation

    • 摘要:

      It is imperative to develop efficient, reversible and economic technologies for separating CO2 which mainly comes from flue gas, natural gas and syngas. Membranes based on functionalized ionic liquids (ILs) have attracted much attention from researchers in recent years, and have been considered as a very promising technology. This feature article focuses on the research progress in CO2 separation using functionalized IL membranes. The recent advances in the preparation, separation performance, and separation mechanism of supported IL membranes (SILMs), pure poly(ionic liquid) (PIL) membranes, PIL-copolymer membranes, PIL-IL composite membranes and polymer-IL composite membranes for CO2 separation have been reviewed. In addition, the future directions and prospects for CO2 separation using functionalized IL membranes are given.

    • 作者:

      Hongshuai Gao;Lu Bai;Jiuli Han;Bingbing Yang;锁江 张;Xiangping Zhang

    • 刊名:

      Chemical Communications

    • 在线出版时间:

      2018

  • Dimethyl carbonate mediated production of biodiesel at different reaction temperatures

    • 摘要:

      Methanol was replaced by dimethyl carbonate for biodiesel production. In the process, fatty acid methyl ester (FAME) was produced through transesterification of soybean oil with dimethyl carbonate (DMC) using potassium methoxide as a catalyst. This method produced a more attractive by-product, glycerol carbonate (GC). Factors affecting the reaction such as vegetable oil to DMC molar ratio, catalyst concentration, reaction time and reaction temperature were optimized. Triglyceride conversion of 95.8% was obtained at the optimized condition. This process provided an insight into the reactivity of DMC at different temperature. Co-production of FAME and glycerol carbonate (GC) proceeded through carboxymethylation reaction because methoxyl group and carbonyl group are generated which subsequently attacked the carbonyl moiety in glyceride molecules to form the required products.

    • 作者:

      Folasegun A. Dawodu;Olubunmi O. Ayodele;Jiayu Xin;锁江 张

    • 刊名:

      Renewable Energy

    • 在线出版时间:

      2014-8

  • Extractive desulfurization of fuel using N-butylpyridinium-based ionic liquids

    • 摘要:

      Sulfur compounds in fuels have become one of the sources of serious environmental problems. The extractive desulfurization using ionic liquids (ILs) has attracted great attention in recent years. In this work, the pyridinium-based ionic liquids (ILs) N-butylpyridinium thiocyanate ([C4Py][SCN]), N-butylpyridinium bis(trifluoromethylsulfonyl)imide ([C4Py][NTf2]), and N-butylpyridinium dicyanamide ([C4Py][N(CN)2]) were used as extractants for desulfurization of model fuels. The results demonstrate that the structure of the anion influences the extractive performance of ILs, following the order of [NTf2] < [SCN] < [N(CN)2], which was proved by the electrostatic interaction between ions and DBT through molecular dynamics simulations (MD). In addition, the selectivity of sulfur compounds by the extraction process followed the order of dibenzothiophene (DBT) > benzothiophene (BT) > 4,6-dimethyldibenzothiophene (4,6-DMDBT). Moreover, the [C4Py][N(CN)2] can be recycled at least 4 times with little decrease in the desulfurization activity.

    • 作者:

      Hongshuai Gao;Shaojuan Zeng;Xiaomin Liu;Yi Nie;香平 张;锁江 张

    • 刊名:

      RSC Advances

    • 在线出版时间:

      2015

  • Study on ionic liquid/cellulose/coagulator phase diagram and its application in green spinning process

    • 摘要:

      In this work, the cellulose phase separation behavior was investigated by using ionic liquids (ILs) as novel solvents to acquire a green process for cellulose fiber spinning. The cloud point titration method combined with the turbidity correlation equation was used to obtain the ternary diagram of IL/cellulose/coagulator throughout the whole compositional range. The effects of the type of ILs, the cellulose materials, the kind of coagulators and the regeneration temperatures for cellulose fiber manufacturing process on the phase separation behavior were studied systematically. It was found that the linearized cloud point (LCP) curve correlation fits to experimental data well and can be used to quantify the optimized coagulator, and among the studied cases, the system of [EMIM]DEP, cotton pulp and water with the regeneration temperature at 298.15 K is the best. Meanwhile, COSMO-RS was used to predict the interaction between solvent, cellulose and coagulator, and the comparison with the LCP correlation shows good agreement. The crystal structure of the regenerated cotton pulp was determined with XRD, and the result evidences that the crystal structure of the regenerated cellulose transforms from cellulose I to cellulose II. The crystallinity decreases from 96.0% (raw cotton pulp) to 85.6% after 24 h dissolution in [EMIM]DEP at 363.15 K, and it has a slight deviation from 24 h to 72 h, which illustrates that the spinning process can run continuously at 363.15 K when using [EMIM]DEP as the solvent.

    • 作者:

      Yanrong Liu;Yi Nie;Fengjiao Pan;Le Zhou;Xiaoyan Ji;Zhaoqing Kang;锁江 张

    • 刊名:

      Journal of Molecular Liquids

    • 在线出版时间:

      2019-9-1

  • SGM method-based identification of molecule uniqueness in computer-generated reaction scheme of complex systems

    • 摘要:

      Based on the concept of structural groups, in which the number of structural groups was equal to or less than that of atoms in a molecule, the structural groups-based method was proposed to provide a basis to identify molecule accurately and conveniently. The molecular information is represented by Connectivity ID, an assembly of feature vector abstracted from the structural groups. The uniqueness of random molecules, even for the isomers with similar structure, could be perfectly identified by Connectivity ID. Some typical examples were illustrated for validation of the proposed methodology.

    • 作者:

      Long Yan;香平 张;锁江 张;Haiping Shen

    • 刊名:

      Shiyou Xuebao, Shiyou Jiagong/Acta Petrolei Sinica (Petroleum Processing Section)

    • 在线出版时间:

      2012-2

  • Investigation of Cu-and Fe-doped CsH3PMo11VO 40 heteropoly compounds for the selective oxidation of methacrolein to methacrylic acid

    • 摘要:

      Selective oxidation of methacrolein to methacrylic acid was carried out over Cu-and Fe-doped acidic cesium salts of molybdovanadophosphoric acids. The influences of preparation conditions on the structure and catalytic properties of the catalysts were investigated. Results showed that the addition method of NH4+ in the precursors greatly affected the structure of the calcined catalysts. When MoO3, V2O5, and H3PO4 were used to prepare the parent heteropoly acid, which further reacted with the mixed metal nitrates to form the Keggin-type precursor, the addition of ammonia promoted the formation of single-phase cubic secondary structure of the precursor. After being calcined at 360 C for 12 h, ammonium ions totally decomposed, and vanadium ions were partially expelled from the primary Keggin units. The catalytically less active MoO3 phase, observed in the sample calcined in air, did not exist in the sample calcined in N2. When NH4VO3 was used to replace V 2O5 and ammonia to prepare the precursor, the ammonium exhibited higher thermal stability, and the calcination atmosphere had almost no effect on the phase composition of the calcined catalysts. It is also found that Cu and Fe as counterions can improve the redox property and thereby enhance the performance of the catalyst.

    • 作者:

      Heng Zhang;Ruiyi Yan;Li Yang;Yanyan Diao;Lei Wang;锁江 张

    • 刊名:

      Industrial & Engineering Chemistry Research

    • 在线出版时间:

      2013-3-27

  • Study on Cu/MgO/ZnO catalyst for low-temperature synthesis of methanol

    • 摘要:

      A series of Cu/MgO/ZnO catalysts with different Cu:(Mg+Zn) and Mg:Zn molar ratios were prepared by conventional co-precipitation method, which are used for low-temperature methanol synthesis. And Cu/ZnO and Cu/MgO catalysts were prepared as well. Comparison was made among them by characterization. Addition of MgO to Cu/ZnO catalyst could introduce more dispersed Cu+ sites, therefore the catalytic activity was promoted. At 443 K and 5.0 MPa, the activities of prepared catalysts were tested in a slurry reactor using liquid paraffin as solvent. The results indicated that the activity of Cu/MgO/ZnO catalyst was superior to that of Cu/ZnO and Cu/MgO, and when Cu:Mg:Zn=2:1:1, the catalyst had the highest activity: the conversion rate of CO was as high as 63.56%, and the selectivity and space time yield of methanol reached 99.09% and 5.413 mol/(kg · h) respectively. The deactivation phenomenon of Cu/MgO/ZnO catalyst was observed under high reaction temperature, and the characterization results indicated that it was due to the sintering of Cu particles.

    • 作者:

      Yuan Li;香平 张;Lei Wang;春山 李;Long Liu;Tian Long Zhang;锁江 张

    • 刊名:

      Guocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering

    • 在线出版时间:

      2010-8

  • Prediction of the melting points for two kinds of room temperature ionic liquids

    • 摘要:

      Melting points are significant properties for the design and application of ionic liquids (ILs) as green solvents. In this work, the melting points of two kinds of room temperature ionic liquids, imidazolium tetrafluoroborates and imidazolium hexafluorophosphates, were investigated by using a quantitative structure-property relationship (QSPR) approach. The employed descriptors were firstly selected by studying the optimized geometries of four ILs: EmimBF4, BmimBF4, EmimPF6 and BmimPF6. Electrostatic, quantum mechanical and topological descriptors were considered efficient to describe melting points of ionic liquids. A three-parameter model with the squared correlation coefficient, R2, of 0.9047 is developed for 16 kinds of imidazolium tetrafluoroborates, and a six-parameter equation with R2 of 0.9207 is obtained for 25 kinds of imidazolium hexafluorophosphates. The proposed models can be useful for the prediction of the melting points of ILs with similar structural features.

    • 作者:

      Ning Sun;Xuezhong He;Kun Dong;香平 张;兴梅 吕;Hongyan He;锁江 张

    • 刊名:

      Fluid Phase Equilibria

    • 在线出版时间:

      2006-8-25

  • Solid-Liquid Electrolyte as a Nanoion Modulator for Dendrite-Free Lithium Anodes

    • 摘要:

      Rechargeable lithium (Li) metal batteries are considered the most promising of Li-based energy storage technologies. However, tree-like dendrite produced by irregular Li+ electrodeposition restricts it wide applications. Herein, based on a cation-microphase-regulation strategy, we create solid-liquid electrolytes (SLEs) by absorbing commercial liquid electrolytes into polyethylene glycol (PEG) engineered nanoporous Al2O3 ceramic membranes. By means of molecular dynamics simulations and comprehensive experiments, we show that Li ions are regulated and promoted in the two microphases, the channel phase and nonchannel phase, respectively. The channel phase can achieve homogeneous Li+ flux distribution by multiple mechanisms, including its uniform array of nanochannels and ability to suppress lateral dendrite growth by its high modulus. In the nonchannel phase, PEG chains swollen by electrolyte facilitate desolvation and fast conduction of Li+. As a result, the studied SLEs exhibit high ionic conductivity, low interfacial resistance, and the unique ability to stabilize deposition at the Li anode. By means of galvanostatic cycling studies in symmetric Li cells and Li/Li4Ti5O12 cells, we further show that the materials open a path to Li metal batteries with excellent cycling performance.

    • 作者:

      Kaihua Wen;Yanlei Wang;Shimou Chen;曦 王;锁江 张;Lynden A. Archer

    • 刊名:

      ACS applied materials & interfaces

    • 在线出版时间:

      2018-6-20

  • Synthesis and applications of ionic liquids in clean energy and environment

    • 摘要:

      Ionic liquids (ILS) are typically referred to as “green” or “designer” solvents. These solvents consist entirely of ionic species exhibiting many fascinating properties, such as non-flammability, low vapour pressure, wide electrochemical window and thermodynamic kinetic stability. Moreover, these remarkable properties can also be adjusted by using various synthesis methods. The application of ILs solves many major problems in green energy production and environment including solar energy, biomass and CO2 adsorption. Although, given our current state of knowledge, the applications of ILs are unpredictable; they have nonetheless rapidly attracted enormous attention in the fields of modern physical chemistry, materials science, applied technologies and engineering. This review focuses on the basic ILs synthesis methods and the latest advancements in the clean energy and environmental application of ILs.

    • 作者:

      Feng Guo;锁江 张;键吉 王;Botao Teng;Tengyan Zhang;Maohong Fan

    • 刊名:

      Current Organic Chemistry

    • 在线出版时间:

      2015-1-1

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