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

Research output: Contribution to journalArticle

Author(s)

Maarten C. Verbraeken, Roberto Mennitto, Veselina M. Georgieva, Elliott L. Bruce, Alex G. Greenaway, Paul A. Cox, Jung Gi Min, Suk Bong Hong, Paul A. Wright, Stefano Brandani

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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.
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Details

Original languageEnglish
Article number117846
Number of pages14
JournalSeparation and Purification Technology
Volume256
Early online date7 Oct 2020
DOIs
Publication statusE-pub ahead of print - 7 Oct 2020

    Research areas

  • ZSM-25, Adsorption, Synchrotron X-ray diffraction, Zero Length Column technique, Lattice Fluid

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