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High CO2 absorption capacity by chemisorption at cations and anions in choline-based ionic liquids
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Kemiteknik.ORCID-id: 0000-0002-6295-4112
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Kemiteknik. Institute of Physics, Kazan Federal University, Russia.ORCID-id: 0000-0002-6810-1882
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Kemiteknik.ORCID-id: 0000-0003-3652-7798
2017 (engelsk)Inngår i: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 19, nr 46, s. 31216-31226Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The effect of CO2 absorption on the aromaticity and hydrogen bonding in ionic liquids is investigated. Five different ionic liquids with choline based cations and aprotic N-heterocyclic anions were synthesized. Purity and structures of the synthesized ionic liquids were characterized by 1H and 13C NMR spectroscopy. CO2 capture performance was studied at 20 °C and 40 °C under three different pressures (1, 3, 6 bar). The IL [N1,1,6,2OH][4-Triz] showed the highest CO2 capture capacity (28.6 wt%, 1.57 mol of CO2 per mol of the IL, 6.48 mol of CO2 per kg of the ionic liquid) at 20 °C and 1 bar. The high CO2 capture capacity of the [N1,1,6,2OH][4-Triz] IL is due to the formation of carbonic acid (–OCO2H) together with carbamate by participation of the –OH group of the [N1,1,6,2OH]+ cation in the CO2 capture process. The structure of the adduct formed by CO2 reaction with the IL [N1,1,6,2OH][4-Triz] was probed by using IR, 13C NMR and 1H–13C HMBC NMR experiments utilizing 13C labeled CO2 gas. 1H and 13C PFG NMR studies were performed before and after CO2 absorption to explore the effect of cation–anion structures on the microscopic ion dynamics in ILs. The ionic mobility was significantly increased after CO2 reaction due to lowering of aromaticity in the case of ILs with aromatic N-heterocyclic anions.

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Royal Society of Chemistry, 2017. Vol. 19, nr 46, s. 31216-31226
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URN: urn:nbn:se:ltu:diva-66453DOI: 10.1039/C7CP07059DISI: 000416425400023PubMedID: 29143022Scopus ID: 2-s2.0-85036626114OAI: oai:DiVA.org:ltu-66453DiVA, id: diva2:1155381
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Validerad;2017;Nivå 2;2017-12-01 (rokbeg)

Tilgjengelig fra: 2017-11-07 Laget: 2017-11-07 Sist oppdatert: 2017-12-19bibliografisk kontrollert

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Forlagets fulltekstPubMedScopushttp://pubs.rsc.org/en/content/articlehtml/2017/cp/c7cp07059d

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Shah, Faiz Ullah

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