Synthesis of Cs-ABW nanozeolite in organotemplate-free system

Tamara Mahmoud Ali Ghrear (1) , Séverinne Rigolet (2, 3) , T. Jean Daou (2, 3) , Svetlana Mintova (4) , Tau Chuan Ling (5) , Soon Huat Tan (1) , Eng-Poh Ng (1)

1 USM - Universiti Sains Malaysia
2 LMPC - Laboratoire de Matériaux à Porosité Contrôlée
3 IS2M - Institut de Science des Matériaux de Mulhouse
4 LCS - Laboratoire catalyse et spectrochimie
5 UM - University of Malaya = Universiti Malaya [Kuala Lumpur, Malaisie]

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.

Keywords: Cs-ABW; Zeolite nanocrystals; Nucleation; Crystal growth; Template-free synthesis; Fast hydrothermal synthesis

Domains: Chemical Sciences

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, 2019, 277, pp.78-83. ⟨10.1016/j.micromeso.2018.10.014⟩. ⟨hal-02047590⟩