The isothermal sorption experiments of CH₄, CO₂ and CH₄/CO₂ mixture gases on shale were performed. The sorption affinities of CH₄, CO₂ and CH₄/CO₂ mixture gases were compared using Henry’s coefficient (K_H). The thermodynamics of sorption of CH₄, CO₂ and their mixture were discussed based on surface potential (Ω), entropy loss (ΔS) and change of Gibbs free energy (ΔG). It is shown that the uptakes of CO₂ is largest, followed by CH₄/CO₂ mixture gases and CH₄ in sequence. The introduction of a small amount of CO₂ into mixture gases can significantly enhance the adsorption quantity of mixture gases and suppress the adsorption of CH₄. The lower pressure and the smaller CO₂ mole fraction in bulk phase (y_CO2) improve separation factor and boost the displacement of adsorbed CH₄ by CO₂. K_H, Ω and ΔS for CO₂ are higher than those for CH₄, and K_H, Ω and ΔS for CH₄/CO₂ mixture gases are between those for CH₄ and CO₂. Increasing y_CO2 increases K_H, Ω and ΔS. ΔG of CO₂ and CH₄/CO₂ mixture gases are bigger than that of CH₄. CO₂ adsorption is more spontaneous and the introduction of CO₂ enlarges the spontaneity degree of adsorption of mixture gases.

在页岩上进行了CH ₄，CO ₂和CH ₄ / CO ₂混合气体的等温吸附实验。使用亨利系数（K _H）比较了CH ₄，CO ₂和CH ₄ / CO ₂混合气体的吸附亲和力。根据表面电势（Ω），熵损失（ΔS）和吉布斯自由能（ΔG）的变化，讨论了CH ₄，CO ₂及其混合物吸附的热力学。结果表明，CO ₂的吸收量最大，其次是CH₄ / CO ₂混合气体和CH ₄依次。将少量的CO ₂引入混合气体中可以显着提高混合气体的吸附量并抑制CH ₄的吸附。较低的压力和较小的本体相中的CO ₂摩尔分数（y _CO2）提高了分离系数，并提高了CO ₂对吸附的CH ₄的置换。ķ _ħ，Ω和Δ小号对于CO ₂比为CH更高₄，和ķ _ħ，Ω和Δ小号为CH ₄ / CO ₂混合气体是那些CH之间₄和CO ₂。增加ÿ _CO2增加ķ _ħ，Ω和Δ小号。Δ ģ CO的₂和CH ₄ / CO ₂混合气体是大于CH的更大₄。CO _2的吸附更自发，引入CO _2可以增加混合气体的吸附自发度。