Ship-in-a-bottle synthesis of amine-functionalized ionic liquids in NaY zeolite for CO₂ capture

Abstract

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.

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ORCID for Zheng Jiang: orcid.org/0000-0002-7972-6175

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