Abstract
Evaluation of immobilized ionic liquids (ILs) as an alternative to amine scrubbing has been a subject of several studies described in the literature. In this work, two ionic liquids were immobilized by grafting in two mesoporous silica samples used as solid supports: MCMRH obtained from rice husk and commercial MCM-41. Sorption capacities (CO2) and selectivities (CO2/CH4) of the above materials were evaluated using the pressure decay technique at equilibrium pressure of 0.4 MPa. Samples were characterized by TEM, XPS, FTIR, NMR, TGA, XRD, FESEM and BET. The selectivities of immobilized silicas using 1-methyl-3-(3-trimethoxysilylpropyl) imidazolium chloride (IL-B) were approximately 25% higher when compared to the corresponding unmodified mesoporous silica samples. Encouraging selectivity values and low-cost of the MCMRH derivatives encourage engineering efforts to develop large-scale CO2 sorption setups based on this new material.
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