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Understanding CO2 adsorption in a flexible zeolite through a combination of structural, kinetic and modelling techniques

Title
Understanding CO2 adsorption in a flexible zeolite through a combination of structural, kinetic and modelling techniques
Authors
Maarten C. VerbraekenRoberto MennittoVeselina M. GeorgievaElliott L. BruceAlex G. GreenawayPaul A. CoxMin, Jung GiHong, Suk BongPaul A. WrightStefano Brandani
Date Issued
Feb-2021
Publisher
Pergamon Press Ltd.
Abstract
In this study we show how non-trivial equilibrium and kinetic adsorption behaviour in a flexible zeolite can be understood through a combination of experimental characterisation and modelling. Flexible zeolites, such as those in the RHO-family, can exhibit unusual stepped isotherms in the presence of CO2, but their structural complexity makes it hard to attribute a clear mechanism. Here we present a structural and kinetic study on (Na,TEA)-ZSM-25, an extended member of the RHO-family, and show that by combining diffraction data, lattice fluid modelling and dynamic column experiments, we obtain a plausible mechanism for CO2 adsorption and transport in this material. It is evident that by using any single technique, the behaviour is too complex to be readily understood. This is to our knowledge the first study to measure and model the changing kinetics due to adsorption induced framework flexibility.
Keywords
Carbon dioxide; Kinetics; Tea; Zeolites; Adsorption behaviour; Column experiments; Diffraction data; Framework flexibility; Modelling techniques; Non-trivial equilibrium; Plausible mechanisms; Structural complexity; Adsorption
URI
http://oasis.postech.ac.kr/handle/2014.oak/104924
ISSN
1383-5866
Article Type
Article
Citation
Separation and Purification Technology, vol. 256, 2021-02
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홍석봉HONG, SUK BONG
Div of Environmental Science & Enginrg
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