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Effects of carbon dioxide captured from ambient air on the infrared spectra of supported amines
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Number of Authors: 22016 (English)In: Vibrational Spectroscopy, ISSN 0924-2031, E-ISSN 1873-3697, Vol. 87, p. 215-221Article in journal (Refereed) Published
Abstract [en]

Amino groups in highly dense coatings of amines on solid supports react with CO2 of ambient air and form ammonium-carbamate ion pairs. These ion pairs change the properties of the amine-modified supports. In numerous studies, the corresponding infrared (IR) spectra have been misinterpreted. The presumption has been that such ion pairs would not form in ambient air, and therefore IR bands have been assigned to moieties of the support and the amines. Here, we discuss common misunderstandings of the IR spectra of amine-modified supports and highlight that proper sample handling is necessary before employing different characterization techniques. We exemplify by performing an IR spectroscopic study of a propylamine-modified porous silica. Such amine-modified supports are relevant to applications in gas separation, catalysis, controlled drug delivery and adsorption of pollutants from water.

Place, publisher, year, edition, pages
2016. Vol. 87, p. 215-221
Keywords [en]
Amine-modified silica, CO2 adsorption, Infrared spectroscopy, PEI, TEPA, CO2 capture
National Category
Chemical Sciences Other Engineering and Technologies
Identifiers
URN: urn:nbn:se:su:diva-137741DOI: 10.1016/j.vibspec.2016.10.006ISI: 000389167800030OAI: oai:DiVA.org:su-137741DiVA, id: diva2:1064905
Available from: 2017-01-13 Created: 2017-01-10 Last updated: 2017-11-29Bibliographically approved

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Bacsik, ZoltanHedin, Niklas
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