Resorcinol-formaldehyde resin polymer was used as rawmaterial for preparation of carbon spheres. Samples were treated with CO2\nflow at 850?C by varying activation times.The CO2 activation granted better pore development of pore structure. The experimental\ndata of CH4 adsorption as a function of equilibrium pressure was fitted by Langmuir and Dubinin-Astakhov (D-A) models. It was\nconcluded that the high surface area and micropore volume of carbon spheres did unequivocally determine methane capacities.\nIn addition, a thermodynamic study of the heat of adsorption of CH4 on the carbon spheres was carried out. Adsorption of CH4\non carbon spheres showed a decrease in the adsorption heat with CH4 occupancy, and the heat of adsorption fell from 20.51 to\n12.50 kJ/mol at 298Kand then increased to a little higher values at a very high loading (>0.70), indicating thatCH4/CH4 interactions\nwithin the adsorption layer became significant
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