Study on the relationship between adsorption amounts and unit isosteric adsorption enthalpy

Abstract: The isothermal adsorption data of a lean coal has been used to regress the parameters of a temperature-pressure-adsorption equation with acceptable accuracy. The lnP vs 1/T plotting of lean coal under 15 cm3/g isosteric adsorption indicates that the adsorption is an exothermic process, the desorption is an endothermic process. Both the unit isosteric adsorption enthalpy (UIAE) and the unit isosteric desorption enthalpy (UIDE) have been calculated for different capacities and show that both UIAE and UIDE decrease with the increase of capacity.

Keywords: The isothermal adsorption; temperature-pressure-adsorption equation; unit isosteric adsorption enthalpy; unit isosteric desorption enthalpy.