CO2 capture on solid materials possesses significant advantages on the operation cost, process for large-scale CO2 capture and storage (CCS) that stimulates great interest in exploring high-performance solid CO2 adsorbents. A ship-in-a-bottle strategy was successfully developed to prepare the [APMIM]Br@NaY host–guest system in which an amine-functionalized ionic liquid (IL), 1-aminopropyl-3-methylimidazolium bromide ([APMIM]Br), was in-situ encapsulated in the NaY supercages. The genuine host-guest systems were thoroughly characterized and tested in CO2 capture from simulated flue gas. It was evidenced the encapsulated ILs are more stable than the bulk ILs. These host–guest systems exhibited superb overall CO2 capture capacity up to 4.94 mmol g−1 and the chemically adsorbed CO2 achieved 1.85 mmol g−1 depending on the [APMIM]Br loading amount. The chemisorbed CO2 can be desorbed rapidly by flushing with N2 gas at 50°C. The optimized [APMIM]Br@NaY system remains its original CO2 capture capacity in multiple cycling tests under prolonged harsh adsorption-desorption conditions. The excellent physicochemical properties and the CO2 capture performance of the host-guest systems offer them great promise for the future practice in the industrial CO2 capture.
CO 2 is the single most important anthropogenic greenhouse gas, contributing $64% to the global radiative forcing. And the rising concentration of CO 2 in the atmosphere will result in global climate change. In this study, 1-alkyl-3-methylimidazolium bromide ionic liquids (ILs) ([C n MIM]Br, n ¼ 4, 6, 8, 10) were ship in a bottle synthesized in NaY zeolite to get [C n MIM]Br@NaY samples and applied for CO 2 capture. These samples were then characterized by elemental analysis, thermal gravimetric analysis (TGA), X-ray diffraction (XRD) and FT-Raman spectra. The results indicated that [C n MIM]Br ILs were successfully encapsulated inside NaY and the encapsulated [C n MIM]Br ILs were much more stable than their bulk analogues. And Raman spectra showed that the relative intensities of some peaks in the [C n MIM]Br@NaY samples had good relationships with the side chain length of ILs. Then the breakthrough curves were recorded to evaluate the CO 2 adsorption capacity of these samples, and indicated that the highest adsorption capacity could reach up to 20.08 mL CO 2 per g [C 4 MIM]Br@NaY. And the cyclic CO 2 adsorption results also illustrated that the [C n MIM]Br@NaY samples were stable and effective with prolonged use. So these samples could be potential materials for CO 2 capture.
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