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Investigation of Poly(ether-b-amide)/Nanosilica Membranes for CO_2/CH_4 Separation

Chinese Journal of Polymer Science 2014年第4期32卷 402-410页

作者： Ehsan Seddigh Morteza Azizi Ehsan Shirzaei Sani Davod Mohebbi-Kalhori Department of Chemical Engineering University of Sistan and Baluchestan

The results of molecular dynamics （MD） simulations on transport process of CO2 and CH4 gases in poly（ether-b- amide）（PEBAX）/nanosilica membranes are discussed. The diffusion coefficient. for CH4 and CO2 gases at 6 cases with different amounts of nanosilica loading in the simulation boxes are presented. The results show that diffusion coefficient. for CO2 gas in all cases are larger than those for the CH4 one. Moreover 10% nanosilica loading case shows maximum effects on diffusion coefficient. and improves them by more than 68% and 157% for CO2 and CH4 gases, respectively. Additionally, the results of 3-D Cartesian trajectories and displacements curves are presented and the jumping attempt of CO2 is significantly more than that of CH4. Due to the rubbery state of PEBAX membranes in ambient temperature, the results confirm that channel lifetimes are very short and then back diffusion is not observed for this polymer.

关键词： Gas separation Polymeric membrane Molecular dynamics diffusion coefficient.

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Electrochemical behavior of diverse vanadium ions at modified graphite felt electrode in sulphuric solution

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Journal of Central South University of Technology 2007年第1期14卷 51-56页

作者：李晓刚黄可龙刘素琴陈立泉 School of Chemistry and Chemical Engineering Central South University

PAN-based graphite felt （PGF） treated in 98% sulphuric acid for 5 h and then kept at 450 ℃ for 2 h was evaluated for their electrochemical performance as electrodes of vanadium redox battery （VRB）. Structure and characteristic of treated PAN-based graphite felt （TPGF） were determined by means of Fourier Transform Infi-ared Spectroscopy, Scanning Electron Microscopy, Brunauer-Emmett-Teller surface area analysis and VRB test system. The results show that the acid and heat synergistic effect increase the number of --COOH functional groups on the PGF surface, and the PGF is eroded by sulphuric acid oxidation, resulting in the surface area increases from 0.31 m^2/g to 0.45 m^2/g. The V（ Ⅱ ）/V（Ⅲ） redox reaction is electrochemically reversible on the TPGF electrode, while the V（Ⅳ）/V（Ⅴ） couple is a quasi reversible process. The diffusion coefficient. of the oxidation for V（Ⅳ）/V（Ⅴ） obtained from the scope of peak current Ip vs scan rate v^1/2 is 4.4×10^-5 cm^2/s. The improvement of electrochemical activity for the electrode is mainly ascribed to the increase of the number of ---COOH groups on the TPGF, which behaves as active sites catalyzing the vanadium species reactions and accelerating electron transfer reaction and oxygen transfer.

关键词： vanadium redox flow battery graphite felt diffusion coefficient.

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Dual gas-solid reactions with converse vector in ferrous metallurgy and its character

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Progress in Natural Science:Materials International 2004年第3期 91-94页

作者： WANG Qi 1*, LI Wenzhong 1, JIANG Maofa 2, MA Xingya 1 and ZHENG Hongxia 1(1. Department of Ferrous Metallurgy, Anshan University of Science and Technology, Anshan 114002, China 2. Department of Ferrous Metallurgy, Northeastern University, Shenyang 110006, China) DepartmentofFerrousMetallurgy AnshanUniversityofScienceandTechnologyApshan114002China DepartmentofFerrousMetallurgy NortheasternUniversityShenyang110006China

A concept of dual gas solid reactions with the converse vector that simultaneously take place inside the pellet and between the gas and pellet has been put forward. Two parameters used for describing the character of dual gas solid reactions are found out and verified by the reduction experiment of the pellet containing carbon in CO 2 atmosphere. Of the parameters, critical rate of dual gas solid reactions with converse vector is used to express minimum rate of gas solid reaction inside the pellet, which is able to make reaction between gas and pellet halt. This rate can be measured and calculated. diffusion coefficient.of dual gas solid reaction with converse vector disturbed by the gas expelled from inside the pellet can also be calculated by the critical rate and reaction rate of gas solid inside the pellet.

关键词： dual gas solid reactions with converse vector critical rate diffusion coefficient.

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