Abstract
Ionic liquids are a kind of green solvent for CO2 capture, and supporting ionic liquids on porous substrates can increase the interface area between ionic liquids and CO2, decrease the gas diffusion resistance, and further reduce the ionic liquids consumption. In this study, the immobilization of ionic liquids [Bmim]BF4 and [Bmim]Ac on SBA-15 were prepared with supercritical CO as solvent and ethanol as co-solvent. The traditional impregnation method was also compared. Results showed that the amount of CO2 adsorbed both increased with the increase of ionic liquid loading, while the adsorption for supported ionic liquids prepared by supercritical CO2 method was higher than that by impregnation method. With same ionic liquids loading amount, the supported ionic liquids prepared by supercritical CO2 method had higher specific surface area and pore volume, and promoted the absorption of CO2 accordingly. The supported ionic liquids were regenerated, which has been testified that the supported ionic liquids have well recycled stability for CO2 adsorption.
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