36 capacity of CH4 is 0.0189 kg/kg at isotherm temperature 27o C and the pressure is 3439.96 kPa. Adsorption isotherms data was correlated with Langmuir, Toth, and Dubinin-Astakhov equation models. From the calculation, Toth equation model more accurate than Langmuir and DubininAstakhov. The deviation between experiment data of adsorption isotherm CO2 and calculation by using Toth equation model is 3.886% for commercial activated carbon data, 3.008% for East of Kalimantan activated carbon, and 2.96% for Riau activated carbon. The deviation between experiment data of adsorption isotherm CH4 and calculation by using Toth equation model is 2.86% for commercial activated carbon data, 2.817% for East of Kalimantan activated carbon, and 5.257% for Riau activated carbon. Isosteric heat of adsorption and adsorption isostere was calculated by using Toth equation model, caused the Toth equation model more accurate than Langmuir and Dubinin-Astakhov models. Isosteric heat of adsorption is needed to know the amount of heat of adsorption released when activated carbon adsorpt the adsorbate.
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