Tuning the CHA framework composition by isomorphous substitution for CO2/CH4 separation
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F22%3A39919510" target="_blank" >RIV/00216275:25310/22:39919510 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11310/22:10436161
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S1385894721028588?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S1385894721028588?via%3Dihub</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.cej.2021.131277" target="_blank" >10.1016/j.cej.2021.131277</a>
Alternative languages
Result language
angličtina
Original language name
Tuning the CHA framework composition by isomorphous substitution for CO2/CH4 separation
Original language description
Chemically and structurally flexible zeolites that adapt to coordinate extra-framework cations show a rich variety of gas adsorption behavior. Zeolite framework composition can be tuned to optimize pore geometry and host-guest interaction to improve selectivity. Herein, we report the study on the influence of zeolite framework nature on the separation of CO2/CH4, for CHA system containing variable isomorphously substituted heteroelements (none, B, Al, Ga, and Ti). Their performance has been evaluated by single-component isotherms and the overall separation ability was found to be related to both the geometry of 8-ring pore apertures in CHA and interaction between zeolite host and guest molecules, as revealed by Rietveld refinement of PXRD after dehydration and variable-pressure FTIR spectroscopy. Nearly isotropic geometry of the 8-ring pore opening in Al-CHA (3.84 x 3.89 angstrom) was obtained, while Ga-CHA exhibits the largest distortion (3.76 x 3.93 angstrom). Despite the smallest ionic radius of B, both the pore size of 8-ring (3.76 x 3.86 angstrom) as well as the unit cell volume are the smallest amongst the studied materials. Due to the combination of both the textural and the chemical factors, the maximum CO2 capacity and separation selectivity over CH4 follows the order Al-CHA > Ga-CHA > B-CHA approximate to Si-CHA > Ti-CHA. These observations suggest that tuning the framework composition of zeolite can strongly influence the separation of small molecules such as CO2 and CH4.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20401 - Chemical engineering (plants, products)
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Chemical Engineering Journal
ISSN
1385-8947
e-ISSN
1873-3212
Volume of the periodical
429
Issue of the periodical within the volume
February
Country of publishing house
CH - SWITZERLAND
Number of pages
8
Pages from-to
"131277-1"-"131277-8"
UT code for WoS article
000728573800002
EID of the result in the Scopus database
2-s2.0-85115657132