Calculation and Comparison of Adsorption Curves of Three ISO-Variables A CSE Study of Lean Coal from China

A series of isothermal adsorption experimental data of MZQ coal sample in Shanxi province of China has been transformed to fit a temperature pressure-adsorption equation with high accuracy. Besides isothermal adsorption curve, isobaric adsorption curve and isosteric adsorption curve have been created and presented. The Clausius-Clapeyron equations have been used to illustrate that gas isosteric adsorption is an exothermic process. The calculation procedure of unit isosteric adsorption enthalpy has been present. The increase of adsorption amount causes the unit isosteric adsorption enthalpy exponentially decreased, so the unit isosteric desorption enthalpy exponentially decreased.