Rationalizing the role of the anion in CO2 capture and conversion using imidazolium-based ionic liquid modified mesoporous silica
authors Aquino, AS; Bernard, FL; Borges, JV; Mafra, L; Dalla Vecchia, F; Vieira, MO; Ligabue, R; Seferin, M; Chaban, VV; Cabrita, EJ; Einloft, S
nationality International
journal RSC ADVANCES
keywords MAGNETIC SUSPENSION BALANCE; CARBON-DIOXIDE SOLUBILITY; CYCLIC CARBONATES; MCM-41; ADSORPTION; CATALYST; CYCLOADDITION; EPOXIDES; MATRIX; TRANSFORMATION
abstract Covalently supported ionic liquids in mesoporous materials were prepared by grafting 1-methyl-3-(3-trimethoxysylilpropyl)imidazolium chloride in MCM-41. Subsequently, the [Cl-] anion was changed to [BF4-], [PF6-] or [Tf2N-]. These materials that present an advantageous combination of the properties of mesoporous solid materials and ionic liquids were evaluated for CO2 sorption as well as catalysts for CO2 conversion into cyclic carbonate using propylene oxide. The material with the [Cl-] anion had the best performance for both CO2 sorption and conversion. A CO2 sorption of 11 w/w% on the adsorbent was achieved and the cycloaddition reaction exhibited a conversion of 67% with 82% selectivity with the catalyst remaining active after 5 cycles, proving that the same sorbent/catalyst setup can be used for both CO2 capture and conversion. Based on the experimental data and electronic-structure numerical simulations, we have hypothesized two major reasons why chloride out performs other anions when adsorbed on MCM-41 unlike unsupported ionic liquids.
publisher ROYAL SOC CHEMISTRY
issn 2046-2069
year published 2015
volume 5
issue 79
beginning page 64220
ending page 64227
digital object identifier (doi) 10.1039/c5ra07561k
web of science category Chemistry, Multidisciplinary
subject category Chemistry
unique article identifier WOS:000358786400026
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journal impact factor 2.936
5 year journal impact factor 3.096
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