Additive-free synthesis of layer-like Faujasite-type zeolite X

Faujasite-type zeolite X (FAU-X) with a layered morphology was successfully synthesized by an additive-free route at a crystallization temperature of 90 °C for 24 h. The sample was dried at 70 °C for 40 h (designated FAU) and then calcined at 450 °C for 5 h (designated FAU-450). Both samples were an...

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Published inJournal of materials science Vol. 59; no. 23; pp. 10169 - 10181
Main Authors Koop-Santa, C., Yocupicio-Gaxiola, R. I., Murrieta-Rico, Fabian N., Avalos-Borja, M., Xiao, Mufei, Petranovskii, V., Reyes-Serrato, A.
Format Journal Article
LanguageEnglish
Published New York Springer US 01.06.2024
Springer Nature B.V
Subjects
Ceramics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Crystallization
Crystallography and Scattering Methods
Dehydration
Differential thermal analysis
Electron microscopy
Materials Science
Microscopy
Morphology
Polymer Sciences
Solid Mechanics
Thickness
X-ray diffraction
Zeolites
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Summary:Faujasite-type zeolite X (FAU-X) with a layered morphology was successfully synthesized by an additive-free route at a crystallization temperature of 90 °C for 24 h. The sample was dried at 70 °C for 40 h (designated FAU) and then calcined at 450 °C for 5 h (designated FAU-450). Both samples were analyzed by X-ray diffraction (XRD), which confirmed the formation of the FAU structure. In addition, from the XRD data and Energy Dispersive Spectroscopy, the Si/Al ratio was determined to be ~ 1.20, which is typical for FAU-X zeolite. Scanning Electron Microscopy revealed that both samples have morphologies corresponding to sheet agglomerate, with FAU-450 having an agglomerate size of 1.41 µm and a sheet thickness of about 0.13 µm. These values are close to the data obtained by transmission electron microscopy, where an agglomerate size of ~ 1.39 µm and a sheet thickness of ~ 0.12 µm were observed. From the Tauc’s plots for FAU and FAU-450, the values of direct and indirect band gaps were determined and found to be close for both samples. In the case of FAU-450, values of 4.35 eV and 3.12 eV were obtained for the direct and indirect transition, respectively. From the TGA/DTA data, it was found that FAU loses mass due to dehydration of the zeolite at temperatures below 350 °C, while the sample is structurally stable up to 700 °C. Graphical Abstract
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-024-09739-6