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Adsorption isotherms and kinetics of carbon dioxide on Chinese dry coal over a wide pressure range

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Abstract

A gravimetric method with in situ density measurement is used to determine the adsorption isotherms and kinetic characteristics of CO2 on Chinese dry coal plug at 293.29, 311.11, 332.79 and 352.57 K and pressures up to 19 MPa. The adsorption and desorption process is reversible, which shows that it is a process of physical adsorption for CO2 on coal. The excess adsorption increases with the increasing pressure at low pressures until the CO2 phase transitions pressure is reached. Above this pressure, the excess adsorption decreases with the increasing pressure. The adsorption behaviour is described using the CO2 density instead of pressure in four thermodynamic models such as modified Langmuir, Langmuir + k, DR and DR + k. It is found that the modified Langmuir + k and DR + k models are more suitable for liquid and supercritical CO2 adsorption, respectively. The adsorption kinetics data are also obtained during the measurement of adsorption isotherms. The experimental data are fluctuant at the initial time range due to the temperature variation in the adsorption cell after high-pressure CO2 is injected. The diffusivity is estimated using a modified unipore model. It is observed that the kinetic parameter C, accounting for the effect of gas diffusivity, increases with the increasing pressure at low pressures and has no obvious relations with pressure at high pressures. In this study, C value has no dependencies with temperature for CO2, and the order of magnitude of the effective diffusivity is approximately 10−5 to 10−4 s−1.

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Acknowledgments

The authors thank the editor and the reviewers for the constructive comments that have helped to improve the quality of the paper. This work has been supported by the National Science and Technology Major Project of China (No. 2011ZX05026-004-07), the National Program on Key Basic Research Project (No. 2011CB707304) and the Fundamental Research Funds for the Central Universities.

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Authors and Affiliations

  1. Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian, 116024, People’s Republic of China

    Yongchen Song, Wanli Xing, Yi Zhang, Weiwei Jian, Zhaoyan Liu & Shuyang Liu

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  1. Yongchen Song
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  2. Wanli Xing
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  3. Yi Zhang
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Correspondence to Yi Zhang.

Appendix

Appendix

See Table 5.

Table 5 Experimental data of the excess adsorption and desorption for CO2 on dry coal
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Song, Y., Xing, W., Zhang, Y. et al. Adsorption isotherms and kinetics of carbon dioxide on Chinese dry coal over a wide pressure range. Adsorption 21, 53–65 (2015). https://doi.org/10.1007/s10450-015-9649-9

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  • DOI: https://doi.org/10.1007/s10450-015-9649-9

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