Issue 1, 2017

Click-based porous cationic polymers for enhanced carbon dioxide capture

Abstract

Imidazolium-based porous cationic polymers were synthesized using an innovative and facile approach, which takes advantage of the Debus–Radziszewski reaction to obtain meso-/microporous polymers following click-chemistry principles. In the obtained set of materials, click-based porous cationic polymers have the same cationic backbone, whereas they bear the commonly used anions of imidazolium poly(ionic liquid)s. These materials show hierarchical porosity and a good specific surface area. Furthermore, their chemical structure was extensively characterized using ATR-FTIR and SS-NMR spectroscopies, and HR-MS. These polymers show good performance towards carbon dioxide sorption, especially those possessing the acetate anion. This polymer has an uptake of 2 mmol g−1 of CO2 at 1 bar and 273 K, a value which is among the highest recorded for imidazolium poly(ionic liquid)s. These polymers were also modified in order to introduce N-heterocyclic carbenes along the backbone. Carbon dioxide loading in the carbene-containing polymer is in the same range as that of the non-modified versions, but the nature of the interaction is substantially different. The combined use of in situ FTIR spectroscopy and micro-calorimetry evidenced a chemisorption phenomenon that brings about the formation of an imidazolium carboxylate zwitterion.

Graphical abstract: Click-based porous cationic polymers for enhanced carbon dioxide capture

Supplementary files

Article information

Article type
Paper
Submitted
02 Oct 2016
Accepted
09 Nov 2016
First published
09 Nov 2016

J. Mater. Chem. A, 2017,5, 372-383

Click-based porous cationic polymers for enhanced carbon dioxide capture

A. Dani, V. Crocellà, C. Magistris, V. Santoro, J. Yuan and S. Bordiga, J. Mater. Chem. A, 2017, 5, 372 DOI: 10.1039/C6TA08574A

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