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ChBE Seminar Professor Margarida Costa Gomes Porous Ionic Liquids to Improve the Separation and Transformation of Gases

Event Type
Seminar/Symposium
Sponsor
Chemical and Biomolecular Engineering
Location
116 Rodger Adams Lab
Date
Mar 28, 2024   2:00 - 3:00 pm  
Speaker
Prof. Margarida Costa Gomes
Contact
Rebecca Dawson
E-Mail
rdawson5@illinois.edu
Phone
217-244-4275
Views
11
Originating Calendar
Chemical & Biomolecular Engineering - Seminars and Events

Porous ionic liquids to improve the separation and transformation of gases

Margarida Costa Gomes

CNRS Chemistry Laboratory, Ecole Normale Supérieure de Lyon

46 allée d’Italie, 69634 Lyon, France

E-mail: margarida.costa-gomes@ens-lyon.fr

Among the alternative sorbents potentially capable of outperforming current separation technologies,

in particular gas separations, ionic liquids are promising candidates. Their most attractive feature is the

possibility of tuning their physical and chemical properties through proper pairing of anions and cations,

which can include reactive groups, enabling the selective absorption of different gases, even at low

partial pressures [1].

We will describe ionic liquid-based absorbents which are liquids with permanent porosity [2], designed

to selectively absorb different gases. The absorbents are stable suspensions of metal-organic

frameworks (MOFs) in salts whose ion pairs are too voluminous to enter the solid pores [3]. The

increase in gas absorption, when compared with the pure ionic liquids, is proportional to the amount of

porous solid in suspension. The thermodynamic analysis of the absorption data, as well as molecular

dynamics simulations, show that the driving force for gas absorption by the porous ionic liquids is

energetic as well as structural and thus is controlled by gas-solid affinity or by the porous liquid free

volume [4,5].

We have shown that porous ionic liquids prepared as stable suspensions of ZIF-8 in phosphonium

acetate or levulinate salts can selectively absorb carbon dioxide with a capacity more than 100% higher

than that of the pure MOF at 1 bar and 303 K [6]. Porous ionic liquids can also be designed to promote

the reaction, at mild conditions of temperature and pressure, of the gases absorbed. Carbon dioxide

can be catalytically coupled with epoxides to form cyclic carbonates in porous ionic liquids containing

alkylphosphonium halides and ZIF-8. The high activity and selectivity observed at atmospheric pressure

and room temperature indicate that porous ionic liquids are a promising and sustainable family of

sorbents for both separating and transforming gases [7,8].

References

[1] Bui et al. Energy Environ. Sci. 2018, 11 (5), 1062–1176.

[2] Giri et al. Nature 2015, 527, 216-221.

[3] Costa Gomes et al. Angew. Chem. Int. Ed. 2018, 57, 11909-11912.

[4] Avila et al. Adv. Mater. Interfaces 2021, 8, 2001982.

[5] Avila et al Materials Adv. 2022, 3, 8848-8863.

[6] Avila et al. Angew. Chem. Int. Ed. 2021, 60, 12876-12882.

[7] Zhou et al. Chem. Commun. 2021, 57, 7922-7925.

[8] Clark et al. J. Chem. Phys. B 2023, 127, 3266−3277

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