Cationic effect study in acetate-based ionic liquids/ZIF-8 composites for CO2 sorption

• Author(s): Ferreira, Tiago J. ; Cabral, Catarina ; Carvalho, Thiago O. ; Pais, Joana ; Esteves, Laura M. ; Silva, Ludmila P. C. ; Reis, Patrícia M. ; Esperança, José M. S. S. ; Esteves, Isabel A. A. C.
• Date: 2024
• Persistent ID: http://hdl.handle.net/10362/174294
• Origin: Repositório Institucional da UNL
• Project/scholarship: info:eu-repo/grantAgreement/FCT/OE/SFRH%2FBD%2F139627%2F2018/PT; info:eu-repo/grantAgreement/FCT//COVID%2FBD%2F152969%2F2023/PT; info:eu-repo/grantAgreement/FCT//2021.07148.BD/PT; info:eu-repo/grantAgreement/FCT/CEEC IND4ed/2021.00511.CEECIND%2FCP1657%2FCT0016/PT; info:eu-repo/grantAgreement/FCT/Concurso para Financiamento de Projetos de Investigação Científica e Desenvolvimento Tecnológico em Todos os Domínios Científicos - 2017/PTDC%2FCTM-CTM%2F30326%2F2017/PT; info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/LA%2FP%2F0008%2F2020/PT; info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F50006%2F2020/PT; info:eu-repo/grantAgreement/FCT/Concurso de avaliação no âmbito do Programa Plurianual de Financiamento de Unidades de I&D (2017%2F2018) - Financiamento Base/UIDB%2F50006%2F2020/PT; info:eu-repo/grantAgreement/FCT/3599-PPCDT/RECI%2FBBB-BQB%2F0230%2F2012/PT
• Subject(s): Cationic effect; CO post-combustion separation; IL@MOF composites; Ionic liquid (IL); Metal-organic framework (MOF); Renewable Energy, Sustainability and the Environment; Materials Science(all); Waste Management and Disposal; Industrial and Manufacturing Engineering; SDG 7 - Affordable and Clean Energy
• Document Type: Journal article
• Language: English
• Contributor(s): LAQV@REQUIMTE; DQ - Departamento de Química; RUN

Description

Publisher Copyright: © 2024 The Authors

Several strategies can be considered for the mitigation of carbon dioxide (CO2) emissions to the atmosphere, and among them is its post-combustion capture/separation from flue gas emitted from coal-fired power plants. In this work, six imidazolium, ammonium- and DABCO-based ionic liquids (ILs) containing the acetate anion were used to impregnate the metal-organic framework (MOF) ZIF-8. The cationic effect was studied to determine how the different cationic families and side alkyl chain size influence the gas sorption performance of the produced IL@MOF composites. The combination of different characterization techniques confirmed IL impregnation, and that the composite materials were microporous and crystalline. Single-component CO2 and nitrogen (N2) sorption-desorption equilibrium measurements were performed at 303 K for ZIF-8 and the IL@ZIF-8 materials. At the low-pressure regime (0–1 bar), synergy was observed for the imidazolium-based composites, especially for the one with the long-side alkyl chain. The ideal CO2/N2 selectivity was calculated for post-combustion composition, and, at 1 bar, [C10MIM][Ac]@ZIF-8 was over four times more selective than ZIF-8, while the selectivity of [C2MIM][Ac]@ZIF-8 at this pressure almost tripled when compared to the MOF. A chemical reaction between CO2 and the imidazolium ILs explained the results.