Study on the efficiency of multiple amino groups in ionic liquids on their sorbents performance for low-temperature CO2 capture

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