TY - JOUR
T1 - Boosting CO2 selectivity by mono- and dicarboxylate-based ionic liquids impregnation into ZIF-8 for post-combustion separation
AU - Ferreira, Tiago J.
AU - Carvalho, Thiago O.
AU - Pais, Joana
AU - Esteves, Laura M.
AU - Silva, Ludmila P. C.
AU - Reis, Patrícia M.
AU - Esperança, José M. S. S.
AU - Esteves, Isabel A. A. C.
N1 - Funding Information:
The authors thank Funda\u00E7\u00E3o para a Ci\u00EAncia e Tecnologia , FCT / MCTES (Portugal), for financial support through PhD grants SFRH/BD/139627/2018 and COVID/BD/152969/2023 (T. J. F.), PhD grant 2021.07148.BD (T. O. C.), FCT Investigator contract ( 2021.00511.CEECIND \u2013 P. M. R ), project PTDC/CTM-CTM/30326/2017 and Material Characterization Laboratory (LAMATE/UFF) for obtaining the PXRD diffractograms. Additionally, the work was also partially supported by the Associate Laboratory for Green Chemistry, LAQV, which is funded by national funds from FCT / MCTES ( 10.54499/UIDB/50006/2020, 10.54499/UIDP/50006/2020 and 10.54499/LA/P/0008/2020 ). The NMR spectrometers are part of The National NMR Facility, supported by FCT / MCTES (Grant RECI/BBB-BQB/0230/2012 ).
Publisher Copyright:
© 2024
PY - 2024/12
Y1 - 2024/12
N2 - Post-combustion carbon dioxide (CO2) capture/separation is considered one of the main ways to minimize the impact of global warming caused by this greenhouse gas. This work used eight mono- and dicarboxylate-based ionic liquids (ILs) to impregnate metal-organic framework (MOF) ZIF-8. This anionic effect was studied for these mostly unreported IL@MOF composites to determine its impact on gas sorption and selectivity performance. Characterization results confirmed IL impregnation into the structure of ZIF-8, along with the conservation of microporosity and crystallinity in composites. Sorption-desorption equilibrium measurements were performed, and CO2 and nitrogen (N2) isotherms were obtained at 303 K for ZIF-8 and IL@ZIF-8 composites. At 0.15 bar, the dicarboxylate-based composite [C2MIM]2[Glu]@ZIF-8 showed the highest CO2 gas sorption, showing 50 % more sorption capacity than the best monocarboxylate-base composites at this pressure. Dicarboxylate-based composites also showed remarkable N2 sorption in the low-pressure range. The ideal CO2/N2 selectivity for a typical post-combustion composition was calculated, and a trend regarding the anionic carbon chain size was observed. The composite [C2MIM][Cap]@ZIF-8 showed nearly five times more selectivity than the pristine ZIF-8 at 1 bar of total pressure. Dicarboxylate-based composites, given their low-pressure high N2 sorption capacity, were not as selective as their respective monocarboxylate-based IL@ZIF-8 materials with the same carbon chain size.
AB - Post-combustion carbon dioxide (CO2) capture/separation is considered one of the main ways to minimize the impact of global warming caused by this greenhouse gas. This work used eight mono- and dicarboxylate-based ionic liquids (ILs) to impregnate metal-organic framework (MOF) ZIF-8. This anionic effect was studied for these mostly unreported IL@MOF composites to determine its impact on gas sorption and selectivity performance. Characterization results confirmed IL impregnation into the structure of ZIF-8, along with the conservation of microporosity and crystallinity in composites. Sorption-desorption equilibrium measurements were performed, and CO2 and nitrogen (N2) isotherms were obtained at 303 K for ZIF-8 and IL@ZIF-8 composites. At 0.15 bar, the dicarboxylate-based composite [C2MIM]2[Glu]@ZIF-8 showed the highest CO2 gas sorption, showing 50 % more sorption capacity than the best monocarboxylate-base composites at this pressure. Dicarboxylate-based composites also showed remarkable N2 sorption in the low-pressure range. The ideal CO2/N2 selectivity for a typical post-combustion composition was calculated, and a trend regarding the anionic carbon chain size was observed. The composite [C2MIM][Cap]@ZIF-8 showed nearly five times more selectivity than the pristine ZIF-8 at 1 bar of total pressure. Dicarboxylate-based composites, given their low-pressure high N2 sorption capacity, were not as selective as their respective monocarboxylate-based IL@ZIF-8 materials with the same carbon chain size.
KW - CO Post-combustion
KW - CO/N separation by selective sorption
KW - IL@MOF composites
KW - Ionic Liquids (IL)
KW - Metal-organic frameworks (MOF)
UR - http://www.scopus.com/inward/record.url?scp=85202584698&partnerID=8YFLogxK
U2 - 10.1016/j.ccst.2024.100282
DO - 10.1016/j.ccst.2024.100282
M3 - Article
AN - SCOPUS:85202584698
SN - 2772-6568
VL - 13
JO - Carbon Capture Science and Technology
JF - Carbon Capture Science and Technology
M1 - 100282
ER -