Abstract
The addition of more amino groups to ionic liquids is promising to enhance supported ionic liquid performance for low-temperature CO2 capture. In our previous studies, 1-ethyl-3-methylimidazolium lysine ([EMIM][Lys]) impregnated on mesoporous silica SBA-15 and commercial PMMA polymer supports showed moderately acceptable CO2 capture capacities. To improve sorbents performance, an amino acid ionic liquid (AAIL) (i.e., –1-aminoethyl-3-methylimidazolium lysine ([AEMIM][Lys]) with one additional amino group attached to the imidazole ring) was synthesized and immobilized into SBA-15 and PMMA with different loadings. The main purpose is to develop efficient AAIL-based sorbents with high CO2 capture capacities and to study the effect of an additional amino group on CO2 adsorption uptakes. 50 wt% [AEMIM][Lys]-immobilized on PMMA exhibited the best CO2 capture capacities of 1.5 mmol/g-sorb and 0.82 mol/mol-AAIL at adsorption-desorption conditions of 30 °C and 100 °C respectively, and under flue gas (CO2 composition of 15 %), when compared with previous results (1.06 mmol/g-sorb and 0.54 mol/mol-AAIL for 50 wt% [EMIM][Lys] supported on PMMA) under the same condition. This higher capacity demonstrated the efficiency of an additional amino group, though slightly far from the theoretical values (2.75 mmol/g-sorb and 1.5 mol/mol-AAIL). Cyclic performances were also conducted to assess the sorbents long-term stabilities.
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