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Open AccessFeature PaperArticle

Hybrid Ionic Liquid–Silica Xerogels Applied in CO2 Capture

Universidade Federal do Rio Grande do Sul (UFRGS), Avenida Bento Gonçalves, 9500. 91501-970 Porto Alegre/RS, Brazil
Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Avenida Ipiranga, 6681. 90619-900 Porto Alegre/RS, Brazil
UCIBIO, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa (FCT-UNL), Campus da Caparica. 2829-516 Caparica, Portugal
Authors to whom correspondence should be addressed.
Appl. Sci. 2019, 9(13), 2614;
Received: 30 April 2019 / Revised: 25 June 2019 / Accepted: 26 June 2019 / Published: 28 June 2019
The imidazolium-based ionic liquids (ILs) are solvents known for selectively solubilizing CO2 from a gas CH4/CO2 mixture, hence we have produced new hybrid adsorbents by immobilizing two ILs on xerogel silica to obtain a solid–gas system that benefits the ILs’ properties and can be industrially applied in CO2 capture. In this work, the ILs (MeO)3Sipmim.Cl and (MeO)3Sipmim.Tf2N were used at different loadings via the sol–gel process employing a based 1-methyl-3-(3-trimethoxysylilpropyl) imidazolium IL associated to the anion Cl or Tf2N as a reactant in the synthesis of silica xerogel. The CO2 adsorption measurements were conducted through pressure and temperature gravimetric analysis (PTGA) using a microbalance. SEM microscopies images have shown that there is an IL limit concentration that can be immobilized (ca. 20%) and that the xerogel particles have a spherical shape with an average size of 20 µm. The adsorbent with 20% IL (MeO)3Sipmim.Cl, SILCLX20, shows greater capacity to absorb CO2, reaching a value of 0.35 g CO2 / g adsorbent at 0.1 MPa (298 K). Surprisingly, the result for xerogel with IL (MeO)3Sipmim.Tf2N shows poor performance, with only 0.05 g CO2 / g absorbed, even having a hydrophobic character which would benefit their interaction with CO2. However, this hydrophobicity could interfere negatively in the xerogel synthesis process. The immobilization of ionic liquids in silica xerogel is an advantageous technique that reduces costs in the use of ILs as they can be used in smaller quantities and can be recycled after CO2 desorption. View Full-Text
Keywords: carbon dioxide; imidazolium ionic liquids; immobilization; xerogel; silica carbon dioxide; imidazolium ionic liquids; immobilization; xerogel; silica
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S. Aquino, A.; O. Vieira, M.; Ferreira, A.S.D.; Cabrita, E.J.; Einloft, S.; O. de Souza, M. Hybrid Ionic Liquid–Silica Xerogels Applied in CO2 Capture. Appl. Sci. 2019, 9, 2614.

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