Understanding CO2 adsorption in a flexible zeolite through a combination of structural, kinetic and modelling techniques
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Date
01/02/2021Author
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Grant ID
EP/N032942/1
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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.
Citation
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
Publication
Separation and Purification Technology
Status
Peer reviewed
ISSN
1383-5866Type
Journal article
Description
The 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).Collections
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