| 초록 |
This study is focused on improving the capacity of alkali metal based sorbents for the recovery of carbon dioxide (CO2) in the fixed bed reactor. Alkali metal carbonate like Na2CO3 and K2CO3 was supported on various porous materials such as zeolites, activated carbon, alumina, and silica gel by impregnation. Carbon dioxide was chemically absorbed by the reaction K2CO3 + CO2 + H2O → 2KHCO3 to form potassium hydrogencarbonate over alkali metal based sorbents in the presence of water vapor at 60oC. The amounts of CO2-uptake decreased with increasing absorption temperature due to the decomposition of potassium hydrogencarbonate. After saturation with carbon dioxide, the sorbents was regenerated by heating in the moist nitrogen at 150oC under atmospheric pressure. The sorption capacity depended on the amount of potassium carbonate loaded and its dispersion. But the sorption capacity was decreased after regeneration in the dry nitrogen. The effects of pretreatement and operating conditions on the absorption capacity and regeneration ability were tested and discussed.
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