Abstract
In this paper, the adsorption isotherms of the carbon dioxide onto highly porous activated carbon have been fitted by advanced statistical physics models to give reasonable interpretations of this process. Fitted physico-chemical parameters values have been deducted by means of the best fitting model. To describe the adsorption process, the fitting results showed that the CO2 molecules formed only one layer on the modified activated carbon. These molecules have been mainly docked with a parallel position on adsorbent receptor sites with adsorption energies varying from 7.16 kJ/mol to 8.24 kJ/mol. These values reflected a physisorption process. The calculated internal energy values suggested the spontaneity and the exothermicity of the CO2 adsorption process onto the modified activated carbon (MAC). As application, the enthalpy function is utilized and calculated to perform the thermodynamic evaluation of an adsorption cycle for a CO2 adsorption cooling system and to calculate the coefficient of performance (COP) as a function of regeneration temperature. This parameter was found to be in the interval [0.09–0.19] corresponding to regeneration temperature varying from 303 K to 343 K.
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