Experiment of supercritical methane adsorption on shale and adsorption modelling

Based on the understanding of adsorption on shale and supercritical adsorption, a new model on adsorption was developed at high temperatures and pressures with some basic assumptions and basic theory of statistical thermodynamics, and with GAI-100 adsorption apparatus the isotherms of methane adsorption on shale and activated carbon were obtained from 0 to 50 MPa at 95.6 ℃. The results show that these two isotherms of shale and activated carbon have the typical feature of supercritical adsorption isotherm, the excess adsorption first increases and then decreases as pressure climbs up, and that the new adsorption model can fit the acquired isotherms effectively, which indicates that the model can reflect the intrinsic character of supercritical adsorption at high pressure. This model can be applied to various substances. © 2015, Central South University of Technology. All right reserved.