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Carbonate "door" in the NaKA zeolite as the reason of higher CO2 uptake relative to N-2
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK), Physical Chemistry.ORCID iD: 0000-0002-0323-0210
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK), Physical Chemistry.
2012 (English)In: Microporous and Mesoporous Materials, ISSN 1387-1811, E-ISSN 1873-3093, Vol. 162, 98-104 p.Article in journal (Refereed) Published
Abstract [en]

Theoretical calculations are performed on a model zeolite A where sodium ions have successively been exchanged with potassium. Using both isolated cluster and periodic DFT calculations, we made an attempt to explain how the chemisorbed carbonate species in the material contribute to the exceptionally high CO2 over N-2 selectivity of nearly 200 found in recent experiments [Liu et al. [1]] with the zeolite NaKA as adsorbent to capture and separate carbon dioxide from a gas mixture containing nitrogen. We have shown that the high carbonate forming at the potassium positions in the 8R windows (KII) results in a larger 8R window diameter potentially enhancing the CO2 uptake if adsorption is measured for individual gases.

Place, publisher, year, edition, pages
2012. Vol. 162, 98-104 p.
Keyword [en]
Separation, Carbon dioxide, Periodic density functional calculations, Alkali form, Linde type zeolite
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:su:diva-81279DOI: 10.1016/j.micromeso.2012.06.005ISI: 000308284800014OAI: oai:DiVA.org:su-81279DiVA: diva2:560518
Note

AuthorCount:4;

Available from: 2012-10-15 Created: 2012-10-15 Last updated: 2017-12-07Bibliographically approved

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