Effect of mono- and divalent extra-framework cations on the structure and accessibility of porosity in chabazite zeolites

Huan V. Doan; Ka Ming Leung; Valeska P. Ting; Asel Sartbaeva

doi:10.1039/d0ce01259a

Effect of mono- and divalent extra-framework cations on the structure and accessibility of porosity in chabazite zeolites

Huan V. Doan, Ka Ming Leung, Valeska P. Ting, Asel Sartbaeva

Department of Chemistry

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Abstract

Chabazite (CHA), one of the most common zeolite framework types, has a remarkable capacity to accommodate a wide range of different cations within the unique CHA framework. This has led to CHA being applied extensively in ion exchange, and studied for highly selective gas sorption, most notably through a trapdoor mechanism. Here, we report the systematic study of a series of six chabazite zeolites (i.e.K-CHA, Cs-CHA, Ca-CHA, Ba-CHA, Sr-CHA and Zn-CHA) obtained by subjecting the parent chabazite (KNa-CHA) to exchange operations with cations of different valences and atomic radii. These samples were examined using numerous techniques and it was found that the differences in valence and size between extra-framework cations exert a significant effect on the abundance of these cations positioned in the framework, resulting in differing nitrogen sorption ability measured in the synthesised chabazite zeolites. These findings will help to understand how the zeolite counter-cation affects the ability of the CHA material to selectively sequester and separate gases through the use of the trapdoor mechanism.

Original language	English
Pages (from-to)	857-863
Number of pages	7
Journal	CrystEngComm
Volume	23
Issue number	4
Early online date	16 Dec 2020
DOIs	https://doi.org/10.1039/d0ce01259a
Publication status	Published - 28 Jan 2021

Bibliographical note

Funding Information:
We are grateful to Dr. David Apperley (Manager Solid-State NMR Service) at Durham University for his help in obtaining the NMR results. We thank Professor Mark T. Weller (University of Bath) for useful discussions on the structure of the exchanged samples. HVD and VPT acknowledge support from the UK Engineering and Physical Sciences Research Council (EP/T517872/1 and EP/R01650X/1, respectively). AS thanks Annette Trust, Alumni Fund of the University of Bath and The Royal Society for funding Enhancement Award and URF.

Publisher Copyright:
© The Royal Society of Chemistry 2020.

Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.

Funding

We are grateful to Dr. David Apperley (Manager Solid-State NMR Service) at Durham University for his help in obtaining the NMR results. We thank Professor Mark T. Weller (University of Bath) for useful discussions on the structure of the exchanged samples. HVD and VPT acknowledge support from the UK Engineering and Physical Sciences Research Council (EP/T517872/1 and EP/R01650X/1, respectively). AS thanks Annette Trust, Alumni Fund of the University of Bath and The Royal Society for funding Enhancement Award and URF.

ASJC Scopus subject areas

General Chemistry
General Materials Science
Condensed Matter Physics

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10.1039/d0ce01259a

CHA_paper_revised_13.12.20_accepted.PDFAccepted author manuscript, 3.15 MB

Cite this

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title = "Effect of mono- and divalent extra-framework cations on the structure and accessibility of porosity in chabazite zeolites",

abstract = "Chabazite (CHA), one of the most common zeolite framework types, has a remarkable capacity to accommodate a wide range of different cations within the unique CHA framework. This has led to CHA being applied extensively in ion exchange, and studied for highly selective gas sorption, most notably through a trapdoor mechanism. Here, we report the systematic study of a series of six chabazite zeolites (i.e.K-CHA, Cs-CHA, Ca-CHA, Ba-CHA, Sr-CHA and Zn-CHA) obtained by subjecting the parent chabazite (KNa-CHA) to exchange operations with cations of different valences and atomic radii. These samples were examined using numerous techniques and it was found that the differences in valence and size between extra-framework cations exert a significant effect on the abundance of these cations positioned in the framework, resulting in differing nitrogen sorption ability measured in the synthesised chabazite zeolites. These findings will help to understand how the zeolite counter-cation affects the ability of the CHA material to selectively sequester and separate gases through the use of the trapdoor mechanism.",

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N2 - Chabazite (CHA), one of the most common zeolite framework types, has a remarkable capacity to accommodate a wide range of different cations within the unique CHA framework. This has led to CHA being applied extensively in ion exchange, and studied for highly selective gas sorption, most notably through a trapdoor mechanism. Here, we report the systematic study of a series of six chabazite zeolites (i.e.K-CHA, Cs-CHA, Ca-CHA, Ba-CHA, Sr-CHA and Zn-CHA) obtained by subjecting the parent chabazite (KNa-CHA) to exchange operations with cations of different valences and atomic radii. These samples were examined using numerous techniques and it was found that the differences in valence and size between extra-framework cations exert a significant effect on the abundance of these cations positioned in the framework, resulting in differing nitrogen sorption ability measured in the synthesised chabazite zeolites. These findings will help to understand how the zeolite counter-cation affects the ability of the CHA material to selectively sequester and separate gases through the use of the trapdoor mechanism.

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Effect of mono- and divalent extra-framework cations on the structure and accessibility of porosity in chabazite zeolites

Abstract

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