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Cationic effect study in acetate-based ionic liquids/ZIF-8 composites for CO2 sorption
Publication . 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.; LAQV@REQUIMTE; DQ - Departamento de Química; Elsevier
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.
2024-12Artigo científico Acesso aberto Ver mais

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Fundação para a Ciência e a Tecnologia

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Concurso para Financiamento de Projetos de Investigação Científica e Desenvolvimento Tecnológico em Todos os Domínios Científicos - 2017

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PTDC/CTM-CTM/30326/2017

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