| 초록 |
The CO2 sorption properties of the CaO-based were investigated at various CO2 concentrations and temperatures. The CaO-based sorbents were prepared by calcining various precursors such as calcium carbonate (cCaO), calcium acetate (aCaO) and calcium oxide (nCaO, Alrich) at 850◦C. The CO2 capture capacity increases with increasing CO2 concentration in the range 0.5 - 20 vol.%. Also, the CO2 capture capacity increased as the temperature was increased from 500 to 700 °C. To investigate the morphological differences of CaO-based sorbents, CaO-based sorbents were characterized by BET (Brunauer–Emmett–Teller). The pore volume and pore diameter of the CaO-based sorbents were followed by: cCaO＞aCaO＞nCaO. From these results, it was concluded that pore volume and pore diameter of the sorbent plays on important role in the CO2 capture capacity due to the effect of CO2 diffusion. The morphological differences of CaO-based sorbents were discussed and characterized by XRD, TG and SEM. |
