Analysis of CO₂ Adsorption Characteristics of Activated Carbon Loaded with Alkali and Alkaline Earth Metal.

Adsorbents that can effectively trap CO2 gas are actively being studied due to worldwide increases in CO2 emissions. Although activated carbon is a leading adsorbent because of advantages such as low costs and a wide specific surface area, it is limited in the sense that it does not adsorb CO2 alone. Therefore, in this study, the adsorption characteristics of CO2 were analyzed by loading KOH and/or Ba(OH)2 on activated carbon at room temperature. Loaded KOH and/or Ba(OH)2 were identified by SEM-EDX and BET analysis, respectively, and the CO2 adsorption performances were confirmed using a gas flow system with GC. We confirmed that the CO2 adsorption performance was significantly improved when activated carbon was pretreated with KOH and Ba(OH)2, respectively. It can be seen from the XPS analysis that, when both KOH and Ba(OH)2 were loaded on the same activated carbon, it had a synergy effect on CO2 adsorption performance.