Evaluation of K2CO3 as CO2 Adsorbent at Ambient Temperature and Ambient Pressure

초록

CO2 is notorious as greenhouse gas, and K2CO3 is one of the most commonly studied CO2 adsorbents. However, its application was frequently limited to the high temperature and high pressure concentration. In this study, CO2 adsorption performance of K2CO3 at ambient temperature and pressure was studied to capture ambient CO2 in indoor spaces. K2CO3 was embedded on zeolite, and the adsorption and desorption characteristic at various temperature conditions was investigated by using a 20 mL tubular reactor column. The mixing ratio of K2CO3 and zeolite was varied to find the maximal point for CO2 adsorption. CO2 gas concentration was controlled by changing mixing ratio of CO2 with N2. Adsorption temperature and desorption temperature were varied from 25 °C to 100 °C, and 25 °C to 200 °C, respectively. The change in the amount of adsorbed CO2 and desorbed CO2 was monitored for each condition.