Naslov
Defect sites in zeolites: origin and healing

Autori
Palčić, Ana ; Moldovan, Simona ; El Siblani, Hussein ; Vicente, Aurelie ; Valtchev, Valentin

Izvornik
Advanced Science (2198-3844) 9 (2021), 4; 2104414, 11

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
zeolites ; defect sites ; silanols ; post-synthesis treatment ; Al/Si incorporation

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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