120th General Meeting of the KCS

Type Poster Presentation
Area Material Chemistry
Room No. Exhibition Hall 2+3
Time 10월 19일 (목요일) 11:00~12:30
Code MAT.P-372
Subject Mechanisms of CO2 absorption and desorption of A2CO3-promoted MgO (A = Na, K, Rb and Cs)) [우수포스터상]
Authors Jin-Su Kwak, Kang Yeong Kim, Kyung-Ryul Oh, YOUNG UK KWON*
Department of Chemistry, Sungkyunkwan University, Korea
Abstract MgO is considered as a promising material for CO2 absorbent in mid-term range (200 ~ 500 °C) because of low regeneration temperature of MgCO3 into MgO and high theoretical absorption capacity. But, low reactivity with CO2 is a major problem for application. In order to increase the reactivity with CO2, alkali metal carbonates (A2CO3; A = Na, K, Rb and Cs) are known as a promoter for MgO. However, the promoting mechanism of alkali carbonate is not clearly proved. In this study, we clarify CO2 absorption and desorption mechanisms of A2CO3-promoted MgO (A = Na, K, Rb and Cs). Before CO2 absorption, absorbents were pre-treated in N2 and this is key process for activating absorbent. During pre-treatment, A2CO3 is partially decomposed and A2O is formed. A2O is doped in MgO and it generates highly base sites on MgO surface. Depending on the A, absorbents show different CO2 absorption and desorption properties. Heavier A2CO3-promoted MgO shows the fastest CO2 absorption kinetics but their cycle is unstable. Detailed experiment data and their explanation will be presented in the poster session.
E-mail fafa2k@naver.com