1. For adsorption of CO2/CH4 mixture, the amount of CO2 adsorbed is higher than that of CH4. This point of view is advantaged for coal seam gas application that CH4 can be replaced by CO2.
2. For adsorption of CO2/CH4/H2O mixture. When water was introduced, the amount of CO2 and CH4 adsorbed is decreased. Water can be condensed more than that of CO2 and CH4. Intermolecular forces of water are stronger than CO2 and CH4 to be the cause of a large hysteresis loop.