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The chemical modification of CWZ-22—commercial activated carbon (AC) with KOH‐ to enhance CO2 adsorption was examined. The effect of different impregnation ratios KOH:CWZ-22 from 1 to 4 was studied. The ACs were characterized by CO2 and N2 sorption, Fourier transform infrared (FTIR), SEM, and XRD methods. The impregnation of CWZ-22 with KOH highly effectively increased the porosity, specific surface area, and pore volume of ACs. The specific surface area of KOH:CWZ-22 = 4 increased to 1299 m2/g as compared with pristine, which is equal to 856 m2/g. The total pore volume raised from 0.51 to 0.77 cm3/g. The chemical modification of CWZ-22 increased the CO2 adsorption capacity up to 38%. The Sips model described very good CO2 adsorption on KOH:CWZ-22 = 4 and pristine sample. The surface of both ACs was homogenous. The values of isosteric heats of adsorption indicated on physisorption.

The Increase of the Micoporosity and CO2 Adsorption Capacity of the Commercial Activated Carbon CWZ-22 by KOH Treatment