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Textural and Fractal Characteristics of KOH-Activated Microporous Carbon Materials and their Carbon Dioxide Storage Performances

Commercial activated carbon has been activated with KOH in order to investigate the effect of textural characteristics on CO2 storage behaviors. The KOH activation has significantly enhanced the textural properties of the adsorbents, as compared to the pristine sample. CO2 adsorption tests on the activated carbons were measured at 298 K and pressures up to 5.0 MPa, and the Langmuir-Freundlich isotherm was used to ﬁt the adsorption data. The CO2 uptake for the resulting adsorbents was signiﬁcantly higher than that of the starting adsorbent in the studied pressure range. To better understand the structures and their influences on the CO2 uptake, fractal analysis was conducted for the adsorbents on the basis of Frenkel-Halsey-Hill (FHH) equation. Fractal dimensions (D1 and D2) that calculated from N2 adsorption data were discussed. The results showed that the two fractal dimensions have different influences on CO2 adsorption capacity. There was a negative linear correlation between CO2 maximum uptake and D1, while CO2 adsorption capacity increased with fractal dimension D2 increasing. Therefore, it was concluded that appropriate pore structure fractal dimension with narrower PSDs within the microporous range had higher CO2 adsorption capacity for the adsorbents.