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Comparing the porosity and surface areas of coal as measured by gas adsorption, mercury intrusion and SAXS techniques

机译：比较通过气体吸附，压汞和SAXS技术测得的煤的孔隙率和表面积

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摘要

In this paper, we compare the surface area, porosity and other physical-structural properties of four bituminous coals from three different coal fields of South Africa determined using carbon dioxide (CO_2) and nitrogen (N_2) low pressure gas adsorption (LPGA), mercury intrusion porosimetry (MIP), and advanced Small Angle X-ray Scattering (SAXS) analytical techniques. Consistent with previous findings, N_2 adsorption underestimated the surface area and porosity of the samples compared to results obtained using the other techniques, but it provided a good insight into the pore size distribution of mesopores. The surface areas and porosities of the samples determined from SAXS were found to be larger than any of the values obtained using the other techniques. This is attributed to SAXS probing a wider range of pores, including pores that are closed to, or restricted in access by, gas adsorption or mercury intrusion and also capturing the properties of pores of diameters between 5 and 17 A, which are not readily measured by any of the other techniques used in this investigation. However, we show here that because each technique probes different pore size ranges in coal, a combination of SAXS with other techniques (gas adsorption, MIP, etc.) provides a richer picture of the nature of the porosity in coals.
机译：在本文中，我们比较了使用二氧化碳（CO_2）和氮气（N_2）低压气体吸附（LPGA），汞测定的来自南非三个不同煤田的四种烟煤的表面积，孔隙率和其他物理结构性质入侵孔隙率法（MIP）和先进的小角X射线散射（SAXS）分析技术。与以前的发现一致，与使用其他技术获得的结果相比，N_2吸附低估了样品的表面积和孔隙率，但它为中孔的孔径分布提供了很好的见识。发现由SAXS测定的样品的表面积和孔隙率大于使用其他技术获得的任何值。这归因于SAXS探测了更大范围的孔，包括那些由于气体吸附或汞侵入而封闭或限制进入的孔，并且还捕获了直径不易测量的5至17 A的孔的特性通过本调查中使用的任何其他技术。但是，我们在这里表明，由于每种技术都探查了煤中不同的孔径范围，因此SAXS与其他技术（气体吸附，MIP等）的结合提供了煤中孔隙性质的更丰富的图景。

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  • 来源
    《Fuel》 |2015年第1期|293-304|共12页
  • 作者

    Gregory N. Okolo; Raymond C. Everson; Hein W.J.P. Neomagus; Mokone J. Roberts; Richard Sakurovs;

  • 作者单位

    Coal Research Group, Unit for Energy Systems, School of Chemical and Minerals Engineering, North-West University, Potchefstroom Campus, Private Bag X6001, Potchefstroom 2520, South Africa;

    Coal Research Group, Unit for Energy Systems, School of Chemical and Minerals Engineering, North-West University, Potchefstroom Campus, Private Bag X6001, Potchefstroom 2520, South Africa;

    Coal Research Group, Unit for Energy Systems, School of Chemical and Minerals Engineering, North-West University, Potchefstroom Campus, Private Bag X6001, Potchefstroom 2520, South Africa;

    Coal Research Group, Unit for Energy Systems, School of Chemical and Minerals Engineering, North-West University, Potchefstroom Campus, Private Bag X6001, Potchefstroom 2520, South Africa;

    CSIRO Energy Technology, 11 Julius Avenue, North Ryde, NSW 2113, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Surface area; Porosity; PSD; SAXS; MIP;

    机译：表面积;孔隙率PSD;SAXS;MIP;

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