Thermodynamic and kinetic affinity of CO2 relative to CH4 and their pressure, temperature and pore structure sensitivity in the competitive adsorption system in shale gas reservoirs

Weidong Xie, Hua Wang, Veerle Vandeginste, Si Chen, Huajun Gan, Meng Wang and Zhenghong Yu

Energy, 2023, vol. 277, issue C

Abstract: The adsorption rate, capacity, affinity of CH4 and CO2 in the competitive adsorption system are controlled by their adsorption thermodynamic and kinetic property. In this work, the experimental results of isothermal adsorption and adsorption kinetic experiments at different temperature and pressure are utilized to investigate the thermodynamic and kinetic mechanism of the adsorption difference between CH4 and CO2. Ten thermodynamic models and seven kinetic models are employed to fit the experimental data, and the thermodynamic and kinetic parameters obtained from the fitting process are used to characterize the diffusion ability, adsorption rate, adsorption capacity, adsorption strength, spontaneity of adsorption, difficulty of adsorption, and driver of adsorption in the gas adsorption process. Furthermore, their difference between CH4 and CO2, temperature and pressure sensitivity, and the influence of shale property and pore structure are discussed to clarify the thermodynamic and kinetic mechanism of the higher adsorption affinity of CO2. Results show that (i) the ability of CO2 entering shale pores and contacting adsorption sites is greater than CH4, (ii) the adsorption capacity and adsorption strength of shale to CO2 is higher, (iii) the adsorption of gas is spontaneous and enthalpy-driven, (iv) the selective coefficient of CO2 relative to CH4 decreases with higher experimental pressure and temperature and is caused by the higher pressure and temperature sensitivity of its thermodynamic and kinetic property. Results of this work are of specific reference for research on the adsorption thermodynamic and kinetic behavior of gases and designing schemes of CO2 injection into shale gas reservoirs.

Keywords: Adsorption affinity; Adsorption thermodynamics; Adsorption kinetics; Temperature and pressure sensitivity; Shale gas reservoirs (search for similar items in EconPapers)
Date: 2023
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:277:y:2023:i:c:s0360544223009854

DOI: 10.1016/j.energy.2023.127591

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