Influence of the ultrasonic-assisted synthesis on Al distribution in a MOR zeolite: from gel to resulting material

Two Al-rich mordenite samples were prepared by the same synthesis procedure except for the activation of the gel for which classical stirring and ultrasonic pretreatment was used. The organization of Al atoms both in the synthesis gel and zeolite product was investigated. Although both methods of th...

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Bibliographic Details
Published inNew journal of chemistry Vol. 45; no. 41; pp. 19294 - 1933
Main Authors Olszowka, Joanna E, Pashkova, Veronika, Kornas, Agnieszka, Dedecek, Jiri, Brus, Jiri, Urbanova, Martina, Tabor, Edyta, Klein, Petr, Brabec, Libor, Mlekodaj, Kinga
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 25.10.2021
Subjects
Aluminum
NMR spectroscopy
Pretreatment
Silicon
Stirring
Synthesis
Zeolites
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Summary:Two Al-rich mordenite samples were prepared by the same synthesis procedure except for the activation of the gel for which classical stirring and ultrasonic pretreatment was used. The organization of Al atoms both in the synthesis gel and zeolite product was investigated. Although both methods of the gel activation resulted in a similar transformation of Al and Si source according to NMR spectroscopy, stirring provided a significantly higher fraction of AlSiAl sequences in the gel compared to the ultrasonic pretreatment. These sequences were transferred to the zeolite product and were more populated in the conventionally prepared mordenite. Al atoms of AlSiAl sequences face different channels and mainly behave as single Al atoms, but they can also form Al pairs or close unpaired Al atoms, observed for the first time for mordenite. Two Al-rich mordenite samples were prepared by the same synthesis procedure except for the activation of the gel for which classical stirring and ultrasonic pretreatment was used.
Bibliography:COO
27
acetonitrile adsorption. See DOI
29
Electronic supplementary information (ESI) available: SEM images of mordenites prepared by US assisted synthesis (MOR-U), and by a standard approach (MOR-R)
10.1039/d1nj00685a
Al DQ coherence followed for recoupling periods ranging from 200 to 2000 μs; concentration of SiOHAl calculated based on the intensity of the band at 3613 cm
Si MAS NMR spectrum of MOR-U (a), and MOR-R (b); comparison of
1
Al DQF MAS NMR spectra of Al(CH
3
the build-up of
Al MAS NMR and
on FTIR spectra of evacuated H-forms of MOR-R and MOR-U, and after d
ISSN:1144-0546
1369-9261
DOI:10.1039/d1nj00685a