科创中国

锁江 张;Xiaochun Zhang

2011

Pebax1657 is known as a promising polymeric membrane material for CO₂ separation. In order to further improve its gas separation performance, different polymers containing ethylene oxide (EO)groups are incorporated into the Pebax1657 matrix to form mixed matrix membranes (MMMs). Liquid-like nanoparticle organic hybrid materials (NOHM-I-HPE, “I” stands for “ionic bond” and “HPE” refers to polyetheramine (“PE”)with a high (“H”)ether group content), which are made of polyetheramine chains tethered onto functionalized silica nanoparticles, have shown high solubility of CO₂. In this study, the homogenous NOHM-I-HPE/Pebax1657 MMMs with different NOHM-I-HPE loadings are prepared and investigated. The results indicate that the addition of NOHM-I-HPE leads to a decrease in glass transition temperature of Pebax1657 and an increase in EO content of the MMMs. Influences of NOHM-I-HPE content on CO₂, N₂ and CH₄ permeations are investigated at 23 °C and 1 bar. For the NOHM-I-HPE loading ranging from 0 to 60 wt%, solubility coefficients of the MMMs for CO₂ greatly increase from 1.16 to 3.84 cm³ (STP)/(cm³·bar), while those for CH₄ and N₂ only increase from 0.078 to 0.094 cm³ (STP)/(cm³·bar)and from 0.013 to 0.026 cm³ (STP)/(cm³·bar), respectively. Although the CO₂/N₂ selectivity slightly decreases with an increase in the NOHM-I-HPE loading, the CO₂/CH₄ selectivity is improved in the newly developed NOHM-I-HPE/Pebax1657 MMMs. These results indicate that the NOHM-I-HPE/Pebax1657 MMMs are very promising candidates for selective CO₂ separation for various energy related applications.

Junfeng Wang;Wenjuan Fang;Jianquan Luo;Ming Gao;Yinhua Wan;锁江 张;Xiangping Zhang;Ah Hyung Alissa Park

Journal of Membrane Science

2019-8-15

Yuhuan Chen;锁江 张;Xiaoliang Yuan;Yanqiang Zhang;香平 张;Wenbin Dai;Ryohei Mori

Thermochimica Acta

2009-1-15

A series of adamantane-based ionic liquids (ADM-ILs) with [MF_n]^- anions were synthesized as cocatalysts for the alkylation of isobutane and butene. By systematically tuning the structures of the cation and anion and their combination, we obtained the optimized ionic liquid, ADM-C₁₂-SbF₆, which exhibited significant enhancements in the C₈ selectivities [especially to trimethylpentanes (TMPs)], the research octane number (RON) of the alkylate products, and the lifetime of sulfuric acid. The selectivity to TMPs was improved from 81.9% to 84.5%, and the alkylate RON was improved from 96.6 to 98.6 upon the addition of the ADM-ILs. In addition, the lifetimes of the ADM-IL/H₂SO₄ systems were increased to twice that of H₂SO₄ alone. Based on experimental measurements and DFT calculations, all of these enhancements were attributed to the multifunctions cooperatively integrated into the task-specific ADM-ILs, such as surfactant action, improving the interfacial properties of the acid/hydrocarbon biphases; buffer action, stabilizing the acidity changes during the reaction process; and hydride donor action, increasing the H^- transfer rate, which promoted the production of TMPs. This study is beneficial for improving the isobutane alkylation process catalyzed by concentrated sulfuric acid. (Graph Presented).

Liuyang Wang;Guoying Zhao;Xiaoqian Yao;保增 任;锁江 张

Industrial & Engineering Chemistry Research

2017-7-19

Destructive gas generation with associated swelling has been the major challenge for the large-scale application of Li₄Ti₅O₁₂ (LTO)-based lithium-ion batteries (LIBs), especially when the LIBs work at high temperature. Here we report a new kind of Li₄Ti₅O₁₂-rutile TiO₂ (LTO-RTO) hybrid nanowire array electrode that can be cycled at elevated temperatures. After assembling the optimized LTO-RTO hybrid array as the anode and commercial LiCoO₂ (LCO) film as the cathode, the obtained lithium-ion full cell exhibits outstanding performance with an ultralong lifetime at 60 °C (∼83.6% of its initial capacity can be retained at the end of 500 cycles at ∼2.5 C). Based on comparative experiments, we proposed a reasonable mechanism and, further, provided a reasonable verdict about the gas generation: the H₂ and CO generation from the LTO electrode are significantly associated with the (111) facet. The presence of more LTO (400) planes than (111) ones in the optimized LTO-RTO electrode is the essential reason for long-term cycling at 60°C without gassing. Our work implies that an ability to tune the crystal facet orientation of electrode nanostructures will be meaningful in the practical design of next-generation high-stability LIBs.

Junling Guo;Wenhua Zuo;Yingjun Cai;Shimou Chen;锁江 张;Jinping Liu

Journal of Materials Chemistry A

2015-3-7

An integrated framework focusing on the energetic analysis and environmental impacts of a CO₂ capture and storage (CCS) system is presented, in which the process simulation method and the life cycle assessment (LCA) method are integrated and applied to the CCS value chain. Three scenarios for carbon capture from post-combustion power plant - an MEA-based system, a gas separation membrane process and a hybrid membrane-cryogenic process are studied. The energy efficiency of power plant and the specific capture energy consumption for each scenario are estimated from process simulation. The environmental impacts for each scenario and the base case without CCS are assessed with LCA method. The results show that the MEA-based capture system faces the challenges of higher energy consumption, and higher environmental impact caused by solvent degradation and emissions compared to gas membrane separation processes. The hybrid membrane-cryogenic process shows a better environmental potential for CO₂ capture from flue gases due to much lower power consumption and relatively lower environmental impacts.

香平 张;Bhawna Singh;Xuezhong He;Truls Gundersen;Liyuan Deng;锁江 张

International Journal of Greenhouse Gas Control

2014-8

In order to deepen the understanding of cation-anion interaction in ionic liquids (ILs), the structure and interionic interaction of 1,1,3,3-tetramethylguanidinium lactate ([tmg][L]) ion pair, including stable configuration, hydrogen bond, frontier molecular orbital, electron density, ion interaction energy and charge transfer, are studied by using ab initio calculations. It is found that more charge-localized character of [tmg][L], especially the C1 carbocation on [tmg]⁺, and the intermolecular -NH₂-associated hydrogen bonds can substantially increase the cation-anion interaction, the interaction energy is 65.3-109.3 kJ/mol higher than that of 1-n-butyl-3-methylimidazolium-based ILs. It is also found that the frontier molecular orbitals, i.e., the HOMO, HOMO + 1 of [L]^- and the LUMO, LUMO + 1 of [tmg]⁺, can effectively interact and more charges are transferred between cation and anion. Based on the above results, the physical property of ILs is discussed.

光认 于;锁江 张

Fluid Phase Equilibria

2007-7-1

A series of molecular sieve SBA-15 supported 1,2,4-triazolium-based ionic liquids (TRILs) were synthesized and employed as efficient catalysts for the synthesis of cyclic carbonates from CO₂ and epoxides. The effects of various parameters, such as functional groups, anions of the catalysts, reaction temperature, pressure, reaction time, and the amount of catalyst used, on the reaction were investigated systematically. In addition, the catalyst can be easily recovered by filtration and reused over six times without loss of catalytic activity. It was found that high yield (80-99%) and excellent selectivity (97-99%) of cyclic carbonates could be achieved at mild conditions (2.0 MPa, 110°C and 2 h) without additional organic solvents or co-catalysts.

Weiguo Cheng;Xi Chen;Jian Sun;Jinquan Wang;锁江 张

Catalysis Today

2013-2-1

In spite of silicon has a superior theoretical capacity, the large volume expansion of Si anodes during Li⁺ insertion/extraction is the bottle neck that results in fast capacity fading and poor cycling performance. In this paper, we report a silicon, single-walled carbon nanotube, and ordered mesoporous carbon nanocomposite synthesized by an evaporation-induced self-assembly process, in which silicon nanoparticles and single-walled carbon nanotubes were added into the phenolic resol with F-127 for co-condensation. The ordered mesoporous carbon matrix and single-walled carbon nanotubes network could effectively accommodate the volume change of silicon nanoparticles, and the ordered mesoporous structure could also provide efficient channels for the fast transport of Li-ions. As a consequence, this hybrid material exhibits a reversible capacity of 861 mAh g⁻¹ after 150 cycles at a current density of 400 mA g⁻¹. It achieves significant improvement in the electrochemical performance when compared with the raw materials and Si nanoparticle anodes.

Weiwei Li;Shimou Chen;Jia Yu;Daliang Fang;保增 任;锁江 张

Green Energy and Environment

2016-4

Ionic liquids (ILs) and supercritical CO₂ (scCO₂) are two promising types of reaction media for green chemical processes due to their unique properties. They can be integrated into chemical reactions as catalysts and solvents to develop green and environment-friendly processes. This review presents current research trends aiming to solve the major chemical engineering issues in light of a fundamental understanding of these media. Applications of these media in the petrochemical industry, biochemical engineering, and fine chemical production are reviewed, suggesting the challenges and directions of utilizing them for green processes prospectively. These recent explorations and successful examples of applications demonstrate that ILs and scCO₂ offer huge potential for novel and green chemical engineering processes.

Ruixia Liu;Peng Zhang;锁江 张;Ting Yan;Jiayu Xin;Xiangping Zhang

Reviews in Chemical Engineering

2016-12-1