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CO2 adsorption equilibrium model incorporating pressure-dependent multiscale pore fractal evolution in coal

Author

Listed:
  • Liu, Yulong
  • Zhang, Yanjun
  • Gao, Xuefeng
  • Cheng, Yuxiang
  • Wang, Siyi

Abstract

The conventional Langmuir equation based on the rigid pore assumption is inadequate to characterise CO2 adsorption equilibrium in coal due to pressure-driven evolution of coal pore structure during adsorption. Integrated FIB-SEM, nano-CT, and SAXS analyses reveal that the multiscale pore structure of Huainan coal exhibits pronounced fractal characteristics. Both the volumetric fractal dimension (DCT=2.094to2.285) of macropores and the surface fractal dimension (DSAXS=2.164to2.641) of meso- and micropores vary with adsorption pressure. Furthermore, the multiscale fractal dimension (Df=2.395to2.696) derived using Hausdorff measure exhibits a marked positive correlation with adsorption pressure. Leveraging high-pressure isothermal CO2 adsorption experiments, the principles and methodology of the pressure-driven modified Langmuir adsorption equation are deduced and systematically summarised. The results indicate that the modified Langmuir adsorption equation significantly outperforms higher accuracy than the conventional model, particularly in pressure-sensitive regions such as the micropore restructuring stage at Pa=2.5MPato3.5MPa, with significantly higher adjusted R2 and lower reduced chi-square (χ2) values, which more comprehensively reflect the influence of pore structure evolution on adsorption equilibrium. Therefore, the proposed equation provides a more accurate theoretical model for predicting CO2 adsorption capacity, with its applicability confirmed through adsorption data from coal samples from the San Juan and Seelyville regions.

Suggested Citation

  • Liu, Yulong & Zhang, Yanjun & Gao, Xuefeng & Cheng, Yuxiang & Wang, Siyi, 2025. "CO2 adsorption equilibrium model incorporating pressure-dependent multiscale pore fractal evolution in coal," Energy, Elsevier, vol. 337(C).
    • Handle: RePEc:eee:energy:v:337:y:2025:i:c:s0360544225042823
    DOI: 10.1016/j.energy.2025.138640
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    References listed on IDEAS

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