Dynamical Equilibrium between Bronsted and Lewis Sites in Zeolites: Framework-Associated Octahedral Aluminum
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F23%3A10467054" target="_blank" >RIV/00216208:11310/23:10467054 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=bH1L0QzWuW" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=bH1L0QzWuW</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1002/anie.202306183" target="_blank" >10.1002/anie.202306183</a>
Alternative languages
Result language
angličtina
Original language name
Dynamical Equilibrium between Bronsted and Lewis Sites in Zeolites: Framework-Associated Octahedral Aluminum
Original language description
While the structures of Bronsted acid sites (BAS) in zeolites are well understood, those of Lewis acid sites (LAS) remain an active area of investigation. Under hydrated conditions, the reversible formation of framework-associated octahedral aluminum has been observed in zeolites in the acidic form. However, the structure and formation mechanisms are currently unknown. In this work, combined experimental (27)Al NMR spectroscopy and computational data reveal for the first time the details of the zeolite framework-associated octahedral aluminium. The octahedral LAS site becomes kinetically allowed and thermodynamically stable under wet conditions in the presence of multiple nearby BAS sites. The critical condition for the existence of such octahedral LAS appears to be the availability of three protons: at lower proton concentration, either by increasing the Si/Al or by ion-exchange to non-acidic form, the tetrahedral BAS becomes thermodynamically more stable. This work resolves the question about the nature and reversibility of framework-associated octahedral aluminium in zeolites.
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
10403 - Physical chemistry
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
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Angewandte Chemie - International Edition
ISSN
1433-7851
e-ISSN
1521-3773
Volume of the periodical
62
Issue of the periodical within the volume
31
Country of publishing house
DE - GERMANY
Number of pages
7
Pages from-to
e202306183
UT code for WoS article
001016096200001
EID of the result in the Scopus database
2-s2.0-85162967021