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    姬国钊

    • 副教授     博士生导师   硕士生导师
    • 性别:男
    • 毕业院校:昆士兰大学
    • 学位:博士
    • 所在单位:环境学院
    • 办公地点:西部校区环境学院B713
    • 联系方式:0411-84706206
    • 电子邮箱:guozhaoji@dlut.edu.cn

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    Investigation and simulation of the transport of gas containing mercury in microporous silica membranes

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    论文类型:期刊论文

    第一作者:Ji, Guozhao

    通讯作者:da Costa, JCD (reprint author), Univ Queensland, Sch Chem Engn, FIM2Lab, Funct Interfacial Mat & Membranes Lab, Brisbane, Qld 4072, Australia.

    合写作者:George, Anthe,Skoulou, Vicky,Reed, Graham,Millan, Marcos,Hooman, Kamel,Bhatia, Suresh K.,da Costa, Joao C. Diniz

    发表时间:2018-11-23

    发表刊物:CHEMICAL ENGINEERING SCIENCE

    收录刊物:SCIE、Scopus

    卷号:190

    页面范围:286-296

    ISSN号:0009-2509

    关键字:Silica membrane; Mercury adsorption; Micropore transport; Effective medium theory; Oscillator model

    摘要:This work investigates the effect of condensable Hg vapour on the transport of N-2 gas across cobalt oxide silica (CoOxSi) membranes. Experimental results suggest that Hg significantly affects N-2 permeation at 100 and 200 degrees C, though this effect is negligible at 300 degrees C. This effect was found to have a correlation with Hg adsorption on CoOxSi xerogels. In order to understand the Hg effect in the transport phenomena of N-2 permeation, the oscillator model was used to model gas transport through pores with different sizes. By including effective medium theory (EMT), the oscillator model fitted well the experimental results and gave good prediction of mass transfer in ultra-microporous materials with a tri-modal pore size distribution, such as silica membranes. It is postulated that Hg seeks lower level potentials in micro-pores, and therefore Hg molecules tend to block small pores (2.5-4 angstrom from 2.9 angstrom), or reduce the average pore size of larger pores (6.7-7.8 angstrom and 12-14 angstrom). Although N-2 permeation decreased with the presence of Hg, it did not decrease when the Hg load was increased by a factor of ten; this strongly suggests the adsorption of Hg molecules in the smaller pores (2.5-4.0 angstrom), or along the pore wall for the larger pore ranges (6.7-7.8 angstrom and 12-14 angstrom). (C) 2018 Elsevier Ltd. All rights reserved.