resumo
Ionic liquids (ILs) have been object of extensive research during the last years due to their potential for industrial application with special interest on carbon dioxide (CO2) capture. Nonetheless, ILs transport properties have stand out as the major drawback for their use on absorption applications. This work proposes ionic liquids encapsulated (ENILs) into carbonaceous submicrocapsules, as a novel material for CO2 capture. This innovative material takes advantage of the ILs gas-absorbing properties and cost-effectiveness while circumventing the IL viscosity by increasing the surface contact area with respect to the bulk fluid. The ENILs prepared using 1-ethyl-3-methylimadazolium bis(trifluoromethylsulfonyl)imide ([C2C1 im] [NTf2]) and N-methyl-2-hydroxyethylammonium pentanoate (m-HEAP), were characterized by SEM, TEM, elemental analysis, TGA and BET to assess their morphology, chemical composition, porous structure and thermal stability. The absorption of CO2 on these materials was studied up to 0.6 MPa and 353 K. Desorption of CO2 from the exhausted ENILs was evaluated, at mild conditions, evidencing the ENILs as suitable separating agents for CO2 capture, with high sorption capacity and fast and complete regeneration, and feasible alternatives to bulk IL absorption.
palavras-chave
FACILITATED TRANSPORT MEMBRANES; CO2 CAPTURE; ACTIVATED CARBON; ABSORPTION; PHASE; BIS(TRIFLUOROMETHYLSULFONYL)IMIDE; SEQUESTRATION; ADSORPTION; REACTIVITY; DIFFUSION
categoria
Engineering
autores
Lemus, J; Da Silva, FFA; Palomar, J; Carvalho, PJ; Coutinho, JAP
nossos autores
Francisco Avelino Silva Freitas
Professor Auxiliar
Jesus Lemus Torres
Bolseiro de pós-Doutoramento
Pedro J. Carvalho
Professor AuxiliarProjectos
CICECO - Aveiro Institute of Materials (UID/CTM/50011/2013)
Projeto de Investigação Exploratória: Pedro Carvalho (IF/00758/2015)
agradecimentos
This work was developed in the scope of the project CICECO Aveiro Institute of Materials, POCI-01-0145-FEDER-007679 (FCT Ref. UID/CTM/50011/2013), financed by national funds through the FCT/MEC and co-financed by FEDER under the PT2020 Partnership Agreement. P.J. Carvalho acknowledges FCT for a contract under the Investigador FCT 2015 (contract number IF/00758/2015) and J. Lemus for the postdoctoral grant (SFRH/BPD/110550/2015).