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Measurement of CO2 adsorption capacity with respect to different pressure and temperature in sub-bituminous: implication for CO2 geological sequestration

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Abstract

CCUS (carbon capture, utilization, and storage) technology is regarded as a bottom method to achieve carbon neutrality globally. CO2 storage in deep coal reservoirs serves as a feasible selection for CCUS, and its storage potential can be attributed to the CO2 adsorption capacity of the coal. In this paper, a series of CO2 adsorption isotherm experiments were performed at different pressures and temperatures in sub-bituminous coal from the southern Junggar Basin (reservoir temperature ∼25.9°C and pressure ∼3.91 MPa). In addition, the high-pressure CO2 adsorption characteristics of the southern Junggar Basin coal were characterized using a supercritical D-R adsorption model. Finally, the CO2 storage capacities in sub-bituminous coal under the in situ reservoir temperature and pressure were analyzed. Results indicated that the excess adsorption capacities increase gradually with increasing injection pressure before reaching an asymptotic maximum magnitude of ∼34.55 cm3/g. The supercritical D-R adsorption model is suitable for characterizing the excess/absolute CO2 adsorption capacity, as shown by the high correlation coefficients > 0.99. The CO2 adsorption capacity increases with declining temperature, indicating a negative effect of temperature on CO2 geological sequestration. By analyzing the statistical relationships of the D-R adsorption fitting parameters with the reservoir temperature, a CO2 adsorption capacity evolution model was established, which can be further used for predicting CO2 sequestration potential at in situ reservoir conditions. CO2 adsorption capacity slowly increases before reaching the critical CO2 density, following a rapid decrease at depths greater than ∼800 m in the southern Junngar Basin. The research results presented in this paper can provide guidance for evaluating CO2 storage potential in deep coal seams.

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Acknowledgments

We acknowledge financial support from the National Natural Science Foundation of China (Grant Nos. 42141012, 41972168, and 42030810), the Peng Cheng Shang Xue Education Fund of CUMT Education Development Foundation (No. PCSX202204), the Fundamental Research Funds for the Central Universities (No. 2020ZDPYZD01) and a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.

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Authors and Affiliations

  1. Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization, China University of Mining and Technology, Xuzhou, 221108, China

    Sijian Zheng, Shuxun Sang, Shiqi Liu & Meng Wang

  2. Carbon Neutrality Institute, China University of Mining and Technology, Xuzhou, 221008, China

    Sijian Zheng, Shuxun Sang, Shiqi Liu & Meng Wang

  3. School of Resources and Geosciences, China University of Mining and Technology, Xuzhou, 221116, China

    Shuxun Sang & Guangjun Feng

  4. China Coal Technology and Engineering Group Coal Mining Research Insitute, Beijing, 100013, China

    Lutong Cao

  5. Xi’an Research Institute, China Coal Technology and Engineering Group, Xi’an, 710077, China

    Xin Jin & Yi Yang

Authors
  1. Sijian Zheng
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  2. Shuxun Sang
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  3. Shiqi Liu
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  4. Meng Wang
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  5. Lutong Cao
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  6. Xin Jin
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  7. Guangjun Feng
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  8. Yi Yang
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Correspondence to Sijian Zheng or Shuxun Sang.

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Zheng, S., Sang, S., Liu, S. et al. Measurement of CO2 adsorption capacity with respect to different pressure and temperature in sub-bituminous: implication for CO2 geological sequestration. Front. Earth Sci. 17, 752–759 (2023). https://doi.org/10.1007/s11707-022-1026-x

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  • DOI: https://doi.org/10.1007/s11707-022-1026-x

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