| 초록 |
Alkali or alkaline earth metal oxides are being paid attention beacuse of its well-known basic properties for capturing acidic CO2. According to the themodynamical estimation, the only candidate for medium temperature CO2 capture is MgO-based sorbent. However, sorption kinetic is quite limited by active solid-gas interface on MgO where CO2 can be adsorbed chemically. Therefore, a kind of promoter/catalyst such as eutectic mixture is required for enhancing active interface. Still it is not clear how eutectic mixture works as promoter/catalyst during reaction and where the reaction can take place. In this work, CO2 sorption behavior among MgO particle and eutectic mixture are investigated under controled temperature and pressure by in-situ TEM. Based on surface, structural change, and eutectic mixture migration, CO2 absorption mechanism on MgO is proposed. This work was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2013R1A1A2060638). |
