Experimental Research on Adsorption Kinetic Characteristics of CH4, CO2, and N2 in Coal from Junggar Basin, China, at Different Temperatures

Abstract

The adsorption kinetic characteristics of CH4, CO2, and N2 in coal provide crucial information for increasing coal seam gas recovery. In this study, isothermal adsorption kinetics experiments were conducted using automatic high-pressure gas adsorption analyzer to reveal differences in adsorption kinetic characteristics of CH4, CO2, and N2 in coal. The research shows that, before reaching adsorption equilibrium, the adsorption ratio of CO2 was higher than that of N2 while that of CH4 was the smallest. The initial adsorption rates of CO2, CH4, and N2 were 1998, 205, and 76 cm3 g−1 h−1, respectively. The order of decreasing gas adsorption rate with respect to the fluctuation zone was CO2 → N2 → CH4. Before reaching adsorption equilibrium, the gas adsorption ratio at high temperature was higher than that at low temperature. The adsorption rates (Rt) of gas were divided into a rapid decay zone (Rt > 0.1 Qe/h), slow decay zone (0.01 Qe/h < Rt < 0.1 Qe/h), and an adsorption equilibrium zone (|Rt| < 0.01 Qe/h). Among the pseudo-first-order kinetic equation, the Fickian diffusion model and the dynamic diffusion model, the latter can best describe the adsorption kinetic process of coal. This work is expected to improve the theoretical basis of enhancing coal seam gas recovery and enrich the theory of gas adsorption in coal.

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Acknowledgments

This research was supported financially by The National Natural Science Foundation of China (Grant Nos. 5173-4007, 5167-4192, and 5187-4236) and The National Natural Science Foundation of Shaanxi Province (Grant Nos. 2020JC-48, 2019JLP-02).

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Correspondence to Haifei Lin or Shugang Li.

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Sun, W., Lin, H., Li, S. et al. Experimental Research on Adsorption Kinetic Characteristics of CH4, CO2, and N2 in Coal from Junggar Basin, China, at Different Temperatures. Nat Resour Res (2021). https://doi.org/10.1007/s11053-021-09812-w

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Keywords

  • Methane adsorption
  • Adsorption ratio
  • Adsorption rate
  • Kinetic characteristic
  • Temperature effect
  • Dynamic diffusion model