Synthesis of Cs-ABW nanozeolite in organotemplate-free system

Abstract : Cesium-aluminosilicate zeolite nanocrystals with ABW framework structure are synthesized free of organic template using hydrothermal approach. The crystallization process of Cs-ABW zeolite nanocrystals by varying the initial gel molar composition, heating temperature and crystallization time was studied. More detailed investigations of the formation of Cs-ABW nanozeolite using a reactive clear precursor hydrogel (4SiO2:1Al2O3:16Cs2O:160H2O) were then carried out. Fully crystalline Cs-ABW nanozeolites were obtained within 120 min at 180 °C and 22 bar, which is considerably faster and safer in comparison to the currently available method involving treatment at 695 °C, 1000 bar and 46 h. The Cs-ABW nanocrystals have grain shape morphology with a mean size of 32 nm and they do not agglomerate for long durations. The nanosized Cs-ABW zeolite has high alumina content (Si/Al ratio = 1.04). These nanocrystals can be prepared in high solid yield (ca. 82%) thus offering a promising route for large-scale production of highly basic zeolite nanoparticles.
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https://hal-normandie-univ.archives-ouvertes.fr/hal-02047590
Contributeur : Pascal Roland <>
Soumis le : lundi 25 février 2019 - 10:03:06
Dernière modification le : lundi 27 mai 2019 - 17:16:23

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Tamara Mahmoud Ali Ghrear, Séverinne Rigolet, T. Jean Daou, Svetlana Mintova, Tau Chuan Ling, et al.. Synthesis of Cs-ABW nanozeolite in organotemplate-free system. Microporous and Mesoporous Materials, Elsevier, 2019, 277, pp.78-83. ⟨10.1016/j.micromeso.2018.10.014⟩. ⟨hal-02047590⟩

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