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Phosphonium-based ionic liquids grafted onto silica for CO2 sorption

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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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Authors and Affiliations

  1. The Key Laboratory of Coal-based CO2 Capture and Geological Storage, Jiangsu Province(CUMT), Xuzhou, Jiangsu, 221008, P.R. China

    J. M. Zhu

  2. School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou, Jiangsu, 221116, P.R. China

    J. M. Zhu, F. Xin, Y. C. Sun & X. C. Dong

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  1. J. M. Zhu
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  2. F. Xin
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  3. Y. C. Sun
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  4. X. C. Dong
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Correspondence to J. M. Zhu.

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Zhu, J.M., Xin, F., Sun, Y.C. et al. Phosphonium-based ionic liquids grafted onto silica for CO2 sorption. Theor Found Chem Eng 48, 787–792 (2014). https://doi.org/10.1134/S0040579514060141

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