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Nature of Chemisorbed CO2 in Zeolite A
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).ORCID iD: 0000-0003-3185-3535
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).ORCID iD: 0000-0002-2542-8113
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).ORCID iD: 0000-0002-7284-2974
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Number of Authors: 52019 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 123, no 35, p. 21497-21503Article in journal (Refereed) Published
Abstract [en]

Formation of CO32- and HCO3- species without the participation of the framework-bridging oxygen atoms (-O-) upon chemisorption of CO2 in zeolite vertical bar Na-12 vertical bar-A is revealed. The transfer of O and H atoms is very likely to have proceeded via the involvement of residual H2O or -OH groups. A combined study by the solid-state H-1 and C-13 MAS NMR, quantum chemical calculations, and in situ infrared spectroscopy showed that the chemisorption mainly occurred by the formation of HCO3-. However, at a low surface coverage of physisorbed and acidic CO2, a significant fraction of HCO3- was deprotonated and transformed into CO32-. We expect that a similar chemisorption of CO2 would occur for low-silica zeolites and other basic silicates of interest for capture of CO2 from the gas mixtures.

Place, publisher, year, edition, pages
2019. Vol. 123, no 35, p. 21497-21503
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Chemical Sciences Chemical Engineering
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URN: urn:nbn:se:su:diva-174874DOI: 10.1021/acs.jpcc.9b04142ISI: 000484882500020OAI: oai:DiVA.org:su-174874DiVA, id: diva2:1360684
Available from: 2019-10-14 Created: 2019-10-14 Last updated: 2019-11-29Bibliographically approved

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Rzepka, PrzemyslawBacsik, ZoltanPell, Andrew J.Hedin, NiklasJaworski, Aleksander
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