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Supercritical CO 2 Exposure-Induced Surface Property, Pore Structure, and Adsorption Capacity Alterations in Various Rank Coals

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  • Zhenjian Liu

    (College of Civil Engineering, Yancheng Institute of Technology, Yancheng 221051, China
    State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
    Geofluids, Geomechanics and Geoenergy (3G) Research Group, Chongqing University, Chongqing 400044, China)

  • Zhenyu Zhang

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
    Geofluids, Geomechanics and Geoenergy (3G) Research Group, Chongqing University, Chongqing 400044, China)

  • Xiaoqian Liu

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
    Geofluids, Geomechanics and Geoenergy (3G) Research Group, Chongqing University, Chongqing 400044, China)

  • Tengfei Wu

    (China Coal Technology and Engineering Group Shenyang Research Institute, Fushun 113122, China
    State Key Laboratory of Coal Mine Safety Technology, Fushun 113122, China)

  • Xidong Du

    (School of Earth Sciences, East China University of Technology, Nanchang 330013, China)

Abstract

Carbon dioxide (CO 2 ) has been used to replace coal seam gas for recovery enhancement and carbon sequestration. To better understand the alternations of coal seam in response to CO 2 sequestration, the properties of four different coals before and after supercritical CO 2 (ScCO 2 ) exposure at 40 °C and 16 MPa were analyzed with Fourier Transform infrared spectroscopy (FTIR), low-pressure nitrogen, and CO 2 adsorption methods. Further, high-pressure CO 2 adsorption isotherms were performed at 40 °C using a gravimetric method. The results indicate that the density of functional groups and mineral matters on coal surface decreased after ScCO 2 exposure, especially for low-rank coal. With ScCO 2 exposure, only minimal changes in pore shape were observed for various rank coals. However, the micropore specific surface area (SSA) and pore volume increased while the values for mesopore decreased as determined by low-pressure N 2 and CO 2 adsorption. The combined effects of surface property and pore structure alterations lead to a higher CO 2 adsorption capacity at lower pressures but lower CO 2 adsorption capacity at higher pressures. Langmuir model fitting shows a decreasing trend in monolayer capacity after ScCO 2 exposure, indicating an elimination of the adsorption sites. The results provide new insights for the long-term safety for the evaluation of CO 2 -enhanced coal seam gas recovery.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:17:p:3294-:d:261273
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    References listed on IDEAS

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