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TMGL (tetramethylguanidinium lactate) is believed to be a potential medium for SO 2 removal. However, direct use of TMGL in SO 2 absorption exhibits unsatisfactory absorption rate and desorption performance, mainly because of its hyperviscosity. In this work, mesoporous molecular sieve MCM-41 (mobil composition of matter no. 41) was employed as support material to prepare a novel absorbent (MCM-41-TMGL). The uptake of SO 2 depends on TMGL, and the absorption rate depends on the porous feature of MCM-41-TMGL. Results show that MCM-41-TMGL dramatically improved the absorption kinetics and desorption efficiency, largely attributed to enhanced gas–liquid interface. Moreover, the absorbed SO 2 in MCM-41-TMGL can be easily stripped out by heating at 90 °C under vacuum, allowing MCM-41-TMGL-10% to maintain 95% of the initial absorption capacity after 10 cycles of regeneration. In addition, the absorption performance of MCM-41-TMGL was investigated under different conditions, including absorption temperature, SO 2 concentration, and vapor concentration of simulated flue gas.
Li et al. (Mon,) studied this question.
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