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Defect sites in zeolites: origin and healing

Palčić, Ana; Moldovan, Simona; El Siblani, Hussein; Vicente, Aurelie; Valtchev, Valentin (2021) Defect sites in zeolites: origin and healing. Advanced Science, 9 (4). ISSN 2198-3844

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This paper deals with the synthesis conditions–defect formation relationship in zeolites. Silicalite-1 (MFI-type) is used as a model material. Samples synthesized from a system with high basicity (at 100 °C), a system with moderate basicity (at 150 °C), and a fluoride- containing system in neutral medium (at 170 °C) were compared. Well-crystallized materials with sizes ca. 0.1, 1-10, and 30-40 µm were obtained. The samples are analyzed by complementary methods providing information on the short- and long-range order in the zeolite framework. A strong correlation between the number of point defects in the zeolite framework and preparation conditions is established. Silicalite-1 synthesized under mild synthesis conditions from a highly basic system exhibits a larger number of framework defects and thus low hydrophobicity. Further, the calcined samples were subjected to aluminum and silicon incorporation by post- synthesis treatment. The Al/Si incorporation in the zeolite framework and its impact on the physicochemical properties is studied by XRD, TEM/SEM, solid-state NMR, FTIR, and thermogravimetric analyses. The defects healing as a function of the number of point defects in the initial material and zeolite crystal size is evaluated. The results of this study will serve for fine-tuning zeolite properties by in situ and post-synthesis methods.

Item Type: Article
Uncontrolled Keywords: zeolites ; defect sites ; silanols ; post-synthesis treatment ; Al/Si incorporation
Subjects: NATURAL SCIENCES > Chemistry
Divisions: Division of Materials Chemistry
Depositing User: Ana Palčić
Date Deposited: 22 Feb 2022 09:49
DOI: 10.1002/advs.202104414

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