119th General Meeting of the KCS

Type Poster Presentation
Area 재료화학
Room No. 포스터발표장
Time 4월 21일 (금요일) 13:00~14:30
Code MAT.P-343
Subject CO2 absorption and desorption mechanisms of A2CO3-promoted MgO (A=Na, K, Rb, Cs)
Authors 곽진수, 김강영, 오경렬, ATILA GULBAHAR, 권영욱*
성균관대학교 화학과, Korea
Abstract CO2 capture and sequestration (CCS) is regarded as a key technology for reducing CO2 emission from power plants based on fossil fuel. Among the various CO2 absorbents, MgO is a possible candidate in intermediate-temperature (200-500 oC) range because of low decomposition temperature from carbonate (MgCO3) into oxide among other alkali and alkaline earth metal carbonate. The theoretical CO2 absorption capacity of MgO is highest among the other absorbents, but sluggish absorption kinetics makes its application hard. In order to overcome this sluggish kinetics, alkali metal carbonates have been suggested for enhancing the reactivity of MgO with CO2. Promoting mechanism was already discussed by previous researchers but their explanation was not sufficient. Here, we suggest developed CO2 absorption and desorption mechanisms of alkali metal carbonates promoted-MgO. Pretreatment effect before CO2 absorption of absorbents is evaluated by 23Na and 25Mg solid state MAS NMR analysis. At the superbase sites in the lattice of MgO, MgO can react with CO2 and MgCO3 can be formed. After that, A2Mg(CO3)2 is formed by interfacial diffusion between A2CO3 and MgCO3. CO2 desorption is the reverse reaction of CO2 absorption. Detailed data will be presented in the poster section.
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