Effect of Activation Temperature on CO2Capture Behaviors of Resorcinol-based Carbon Aerogels

In this study, carbon aerogel (CA) was synthesized using a soft-template method, and the optimum conditions for the adsorption of carbon dioxide ( CO₂ ) by the carbon aerogel were evaluated by controlling the activation temperature. KOH was used as the activation agent at a KOH/CA activation ratio of 4:1. Three types of activated CAs were synthesized at activation temperatures of 800∘C (CA-K-800), 900∘C (CA-K-900), and 1000∘C (CA-K-1000), and their surface and pore characteristics along with the CO₂ adsorption characteristics were examined. The results showed that with the increase in activation temperature from 800 to 900∘C , the total pore volume and specific surface area sharply increased from 1.2165 to 1.2500cm³/g and 1281 to 1526m²/g , respectively. However, the values for both these parameters decreased at temperatures above 1000∘C . The best CO₂ adsorption capacity of 10.9 wt % was obtained for the CA-K-900 sample at 298 K and 1 bar. This result highlights the importance of the structural and textural characteristics of the carbon aerogel, prepared at different activation temperatures on CO₂ adsorption behaviors.