The ionic liquid 1,1,3,3-tetramethylguanidinium lactate (TMGL) was supported onto porous silica particles via a facile impregnation−vaporization method. The TMGL-supported particles gave high porosity and large specific surface area. The SO 2 sorption/desorption properties of the silica-supported TMGL (TMGL−SiO 2 ) were evaluated, and high SO 2 sorption capacity and rate were achieved. Its capacity reached 0.6 g SO 2 /g TMGL in 15−30 min with pure SO 2 gas and 0.15 g SO 2 /g TMGL in 17 h with a N 2 /SO 2 mixture gas that contained 2160 ppm SO 2 . The SO 2 concentration was reduced to 12.6 ppm after sorption. The TMGL−SiO 2 system could be reused for many sorption/desorption cycles without change in its capacity. It was also characterized by good mechanical strength and thermal stability at temperature up to 130 °C. The SO 2 sorbent system appears to be useful in gas desulfurization.
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Zhang et al. (2009) studied this question.
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