abstract
Ionic liquids have gathered special attention due to their potential for carbon dioxide capture, and their potential as solvents for mitigation of climate change. Following the scope of previous works, amino-acid-based ionic liquids encapsulated (ENILs) into carbonaceous submicrocapsules are here proposed as a novel material for CO(2)capture. The ENILs prepared using tetrabutylphosphonium acetate ([P-4,P-4,P-4,P-4][Ac]), used as reference, (2-hydroxyethyl)trimethylammoniuml-phenylalaninate ([N-1,N-1,N-1,N-2(OH)][L-Phe]), (2-hydroxyethyl)trimethylammoniuml-prolinate ([N-1,N-1,N-1,N-2(OH)][L-Pro]), and tetrabutylammoniuml-prolinate ([N-4,N-4,N-4,N-4][L-Pro]) were characterized by SEM, TEM, elemental analysis, TGA, and BET to assess their morphology, chemical composition, porous structure, and thermal stability. The absorption of CO(2)on these materials was studied up to 0.5 MPa and 343 K. The desorption of CO(2)from the saturated ENILs was evaluated, under mild conditions, evidencing these materials as promising agents for CO(2)capture from post-combustion sources, with high sorption capacity and fast and complete regeneration.
keywords
POSTCOMBUSTION CO2 CAPTURE; CARBON-DIOXIDE; MEMBRANE CONTACTORS; ABSORPTION; KINETICS; SOLUBILITY; ACETATE; ANION; WATER; CAPSULES
subject category
Chemistry
authors
Silva, LP; Moya, C; Sousa, M; Santiago, R; Sintra, TE; Carreira, ARF; Palomar, J; Coutinho, JAP; Carvalho, PJ
our authors
Liliana Patrocínio da Silva
PhD Student
Pedro J. Carvalho
Assistant Professor
Tânia Ereira Sintra
Post-Doc FellowshipProjects
SGH : Smart Green Homes (Smart Green Homes)
Projeto de Investigação Exploratória: Pedro Carvalho (IF/00758/2015)
acknowledgements
This work was developed by Portugal 2020 through the European Regional Development Fund (ERDF), in the frame of Operational Competitiveness and Internationalization Programme (POCI), in the scope of the project Smart Green Homes - BOSCH - POCI-01-0247-FEDER-007678, project CICECO-Aveiro Institute of Materials (UIDB/50011/2020 & UIDP/50011/2020), financed by national funds through the FCT/MEC and when appropriate co-financed by FEDER under the PT2020 Partnership Agreement, Ministerio de Economia y Competitividad (MINECO) of Spain (project CTQ2017-89441-R) and Comunidad de Madrid (PT2018/EMT4348). L. P. S., A. R. F. C., and P. J. C. acknowledge FCT for PhD grants (SFRH/135976/2018 and SFRH/BD/143612/2019) and a contract under the Investigator FCT 2015 contract number IF/00758/2015, respectively. The NMR spectrometers are part of the National NMR Network (PTNMR) and are partially supported by Infrastructure Project N degrees 022161 (co-financed by FEDER through COMPETE 2020, POCI and PORL and FCT through PIDDAC).