Understanding CO2 adsorption in a flexible zeolite through a combination of structural, kinetic and modelling techniques
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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.
Verbraeken , M C , Mennitto , R , Georgieva , V M , Bruce , E L , Greenaway , A G , Cox , P A , Gi Min , J , Bong Hong , S , Wright , P A & Brandani , S 2021 , ' Understanding CO 2 adsorption in a flexible zeolite through a combination of structural, kinetic and modelling techniques ' , Separation and Purification Technology , vol. 256 , 117846 . https://doi.org/10.1016/j.seppur.2020.117846
Separation and Purification Technology
Copyright © 2020 Elsevier B.V. All rights reserved. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1016/j.seppur.2020.117846
DescriptionThe authors thank the EPSRC for funding (‘Cation-controlled gating for selective gas adsorption over adaptable zeolites’: EP/N032942/1, VMG, PAW; EP/N033329/1, MV and SB; an NPIF PhD scholarship for ELB, EP/R512199/1).
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