Abstract
Phosphonium-based ionic liquids with varied alkyl chain lengths bearing different anions (Cl−, BF 4 − and PF 6 − ) were prepared and grafted on the commercial silica surface. The modified particles were characterized via FTIR spectroscopy, scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and CO2 sorption/desorption. The effects of the type and activation temperature of silica support, the mole fraction and structure of the grafted ionic liquids on CO2 sorption were discussed in detail. The results indicated that CO2 sorption capacity of the sorbents had little impact on the chain length of the cation, while mainly depended on the anion types. The relationship between the initial mole fraction of ionic liquids and CO2 sorption properties had a non-linear character. Phosponium-cation hexafluorophosphate grafted on type A SiO2 activated under 426 K at ionic liquids/SiO2 feed ratio of 1/1 showed the highest CO2 sorption capacity (6.35 wt %) at 273 K and 100 kPa.
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