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Surface Properties and Pore Structure of Anthracite, Bituminous Coal and Lignite

Author

Listed:
  • Zhenjian Liu

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China)

  • Zhenyu Zhang

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China)

  • Sing Ki Choi

    (Australian Commonwealth Scientific and Research Organization (CSIRO), Locked Bag 10, Clayton South VIC 3169, Australia)

  • Yiyu Lu

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China)

Abstract

Properties of coal surface and pore structure are important aspects to be investigated in coal preparation and utilization. In order to investigate the limits of different probe methods, a comprehensive approach was comparatively used to probe surface properties and pore structure of anthracite, bituminous coal and lignite. Surface morphology of the three coal samples was analyzed by scanning electron microscopy (SEM). Combining mercury intrusion porosimetry (MIP), physisorption method with carbon dioxide (CO 2 ) at 273 K and nitrogen (N 2 ) at 77 K was used to quantify a broad pore size distribution of coals, while FT-IR and water vapor sorption methods were used to study the coal surface properties. The results show that wedge-shaped pores develop with the increase of coal rank due to compression effect. The determined specific surface area (SSA) and pore volume of N 2 decrease with the increase of coal rank, while CO 2 SSA and pore volume are of a kind of U-shaped function of coal rank. MIP results indicate that that the pore size of 10–100 nm accounted for 70.7–97.5% of the total volume in the macropore range. Comparison of different methods indicates that micropores cannot be fully covered by the standard probes. CO 2 adsorption technique can only probe micropores in the range of 0.5 nm to 0.9 nm. Water vapor is not an effective probe to detect the micropores in coals, due to that the water clusters is mainly filled in mesopores and macropores. The results also show that both water vapor adsorption and FT-IR analysis can provide qualitative information of coal surface, rather than qualification of functional groups.

Suggested Citation

  • Zhenjian Liu & Zhenyu Zhang & Sing Ki Choi & Yiyu Lu, 2018. "Surface Properties and Pore Structure of Anthracite, Bituminous Coal and Lignite," Energies, MDPI, vol. 11(6), pages 1-14, June.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:6:p:1502-:d:151483
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    References listed on IDEAS

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    1. Di Gao & Meng Li & Baoyu Wang & Bin Hu & Jianguo Liu, 2017. "Characteristics of Pore Structure and Fractal Dimension of Isometamorphic Anthracite," Energies, MDPI, vol. 10(11), pages 1-11, November.
    2. Agnieszka Dudzińska & Natalia Howaniec & Adam Smoliński, 2017. "Effect of Coal Grain Size on Sorption Capacity with Respect to Propylene and Acetylene," Energies, MDPI, vol. 10(11), pages 1-10, November.
    3. Guangfeng Liu & Yaoxing Bai & Zhaoqi Fan & Daihong Gu, 2017. "Determination of Klinkenberg Permeability Conditioned to Pore-Throat Structures in Tight Formations," Energies, MDPI, vol. 10(10), pages 1-17, October.
    4. Xiaofeng Ji & Dangyu Song & Xiaoming Ni & Yunbo Li & Haotian Zhao, 2018. "Coal Matrix Deformation and Pore Structure Change in High-Pressure Nitrogen Replacement of Methane," Energies, MDPI, vol. 11(1), pages 1-18, January.
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    Cited by:

    1. Zhenjian Liu & Zhenyu Zhang & Xiaoqian Liu & Tengfei Wu & Xidong Du, 2019. "Supercritical CO 2 Exposure-Induced Surface Property, Pore Structure, and Adsorption Capacity Alterations in Various Rank Coals," Energies, MDPI, vol. 12(17), pages 1-14, August.
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    3. Li Zhao & Yang-wen Wu & Jian Han & Han-xiao Wang & Ding-jia Liu & Qiang Lu & Yong-ping Yang, 2018. "Density Functional Theory Study on Mechanism of Mercury Removal by CeO 2 Modified Activated Carbon," Energies, MDPI, vol. 11(11), pages 1-13, October.

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