| 초록 |
MgO has been extensively reported as an efficient solid CO2 sorbent. However, it is still challenge to make MgO stable under TSA (Thermal-Swing Adsorption) operation because high temperature is required for regeneration of MgCO3 to MgO. In this work, TiO2 stabilized MgO sorbents were investigated as candidate for CO2 capture. Compositional modifications are carried out to enhance the CO2 sorption performance of MgO-TiO2 sorbents. It was observed that the phase was transformed in the sequence of MgTiO3 (Mg/Ti=0.5-2.0) → MgO-MgTi2O4 (Mg/Ti=3.0-4.0) → MgO-Mg2TiO4 (Mg/Ti=5.0), and the CO2 adsorption increased in the order MgTiO3 ＜ MgO-Mg2TiO4 ＜ MgO-MgTi2O4. High surface area (111.4 m2/g), large pore volume (0.45 cm3/g), and appropriate basic sites of MgO-MgTi2O4 were beneficial for CO2 adsorption. This work was supported by the National Research Foundation of Korea (NRF) funded by the Ministry of Education (Grant number: NRF-2013R1A1A2060638). |
