Thermodynamic analysis of the difference in adsorption characteristics of CH4 and CO2 on continental shale

In order to explain the difference in adsorption characteristics of CH 4 and CO 2 on continental shale from perspective thermodynamics, isothermal experiments adsorbed by Yanchang Formation Ordos Basin were carried out, excess capacity was corrected absolute capacity. Then Clausius-Clapeyron equation used analyze isosteric heat shale. The results show that, for calculating capacity, Ozawa empirical formula or Van der Waals approximation method should be calculate phase density. selected as basic data adsorption. reason is that has a negative value low stage, which contradictory fact process exothermic, significantly higher than There good linear positive correlation between amount shale, greater . initial 52.04 kJ/mol 27.71 kJ/mol, indicating force stronger