121st General Meeting of the KCS

Type Poster Presentation
Area Material Chemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code MAT.P-349
Subject Comparison of CO2 absorption and desorption mechanisms of MgO promoted by solid and molten alkali metal carbonates
Authors Jin-Su Kwak, Kang Yeong Kim, Kyung-Ryul Oh, Jeong-Min Lee, Young-Uk Kwon*
Department of Chemistry, Sungkyunkwan University, Korea
Abstract One possible solution for reducing the concentration of CO2 at atmosphere is carbon capture and sequestration technologies (CCS). Among the various CO2 capture materials, MgO, which promoted by alkali metal carbonate, has been studied by previous researchers because of the lowest regeneration temperature (400 ~ 500 °C) among alkali and alkaline earth metal oxides-based materials. In this study, we characterize CO2 absorption and desorption mechanisms of solid (A2CO3; A=Na, K, Rb and Cs) and molten ((Li0.435Na0.315K0.25)2CO3) alkali metal carbonate-promoted MgO. Although solid and molten alkali metal carbonate-promoted MgO has same two-step absorption mechanism, details are different depending on the phase of the promoter. Molten alkali carbonate-promoted MgO shows higher MgO conversion ratio and faster conversion kinetics than those of solid alkali carbonate-promoted one. A main difference between molten and solid alkali carbonate is the presence or absence of the liquid reaction medium. Molten alkali carbonate provides liquid reaction medium between MgO and CO2 and this is similar with molten nitrate one. On the other hand, there is no liquid medium in solid alkali carbonate-promoted MgO. Here, CO2 absorption is proceeded at the interface between A2CO3 and MgO. Additionally, we find carbonated product is changed as following the reaction mechanisms. Detailed data and their explanation will be presented in the poster session.
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