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Effects of Supercritical CO 2 Treatment Temperature on Functional Groups and Pore Structure of Coals

Author

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  • Zhaolong Ge

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
    College of Resources and Safety Engineering, Chongqing University, Chongqing 400030, China)

  • Mengru Zeng

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
    College of Resources and Safety Engineering, Chongqing University, Chongqing 400030, China)

  • Yugang Cheng

    (National and Local Joint Engineering Research Center of Shale Gas Exploration and Development, Chongqing Institute of Geology and Mineral Resources, Chongqing 400042, China)

  • Haoming Wang

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
    College of Resources and Safety Engineering, Chongqing University, Chongqing 400030, China)

  • Xianfeng Liu

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
    College of Resources and Safety Engineering, Chongqing University, Chongqing 400030, China)

Abstract

The buried depth of a coal seam determines the temperature at which CO 2 and coal interact. To better understand CO 2 sequestration, the pore structure and organic functional groups of coal treated with different ScCO 2 temperatures were studied. In this study, three different rank coals were treated with ScCO 2 at different temperatures under 8 MPa for 96 h in a geochemical reactor. The changes in pore structure and chemical structure of coal after ScCO 2 treatment were analyzed using mercury intrusion porosimetry, attenuated total reflection Fourier transform infra-red spectroscopy, fractal theory, and curve fitting. The results show that the enhancement effect of ScCO 2 on pore structure of coal becomes less significant as the increase of buried depth. In most of the treated coal samples, the variation proportion of mesopores decreased and the variation proportion of macropores increased. In the relatively higher rank coals, the degree of condensation (DOC) of aromatic rings decreased after treatment with ScCO 2 . The DOC values showed a U-shape relationship with temperature, and the aromaticity showed a downward trend with increasing temperature. The chemical structural changes in the relatively lower rank coal sample were complex. These findings will provide an understanding of mechanisms relevant to CO 2 sequestration with enhanced coalbed methane recovery under different geothermal gradients and for different ranks of coal.

Suggested Citation

  • Zhaolong Ge & Mengru Zeng & Yugang Cheng & Haoming Wang & Xianfeng Liu, 2019. "Effects of Supercritical CO 2 Treatment Temperature on Functional Groups and Pore Structure of Coals," Sustainability, MDPI, vol. 11(24), pages 1-16, December.
    • Handle: RePEc:gam:jsusta:v:11:y:2019:i:24:p:7180-:d:298165
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    References listed on IDEAS

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    1. Zepeng, Wang & Zhaolong, Ge & Ruihui, Li & Xianfeng, Liu & Haoming, Wang & Shihui, Gong, 2022. "Effects of acid-based fracturing fluids with variable hydrochloric acid contents on the microstructure of bituminous coal: An experimental study," Energy, Elsevier, vol. 244(PA).
    2. Li, Yunzhuo & Ji, Huaijun & Li, Guichuan & Hu, Shaobin & Liu, Xu, 2023. "Effect of supercritical CO2 transient high-pressure fracturing on bituminous coal microstructure," Energy, Elsevier, vol. 282(C).

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