Development of monolithic adsorbent via polymeric sol-gel process for low-concentration CO₂ capture

The objective of this research was to develop a new high-performance CO₂ adsorbent with a simple method. Amine hybrid resorcinol-formaldehyde/silsesquioxane composite aerogel (AH-RFSA) was developed through polymeric sol-gel process and supercritical drying (SCD) technique. CO₂ adsorption performances of AH-RFSA in 1% CO₂ gas mixture (CO₂+N₂) were investigated. A rise in adsorption temperature negatively affects the total CO₂ adsorption capacity of AH-RFSA. However, the useful adsorption capacity does not change with adsorption temperature. Water is more positive to useful CO₂ adsorption capacity than to total CO₂ adsorption capacity. The total CO₂ adsorption capacity achieved with the new adsorbent at 30°C under dry and humid 1% CO₂ is 3.57 and 4.43mmol/g, respectively. The useful CO₂ adsorption capacity for complete removal of CO₂ from 1% CO₂ is as high as 3.56mmol/g. The adsorbent preparation method is inspiring and its resulting adsorbent is exceptional in capacity and regenerability.