Micro- and macroscopic observations of the nucleation process and crystal growth of nanosized Cs-pollucite in an organotemplate-free hydrosol

Ng, Eng Poh and Mohammad S., Aleid Ghadah and Rigolet, Severinne and Daou, T. Jean and Mintova, Svetlana and Ling, Tau Chuan (2019) Micro- and macroscopic observations of the nucleation process and crystal growth of nanosized Cs-pollucite in an organotemplate-free hydrosol. New Journal of Chemistry, 43 (44). pp. 17433-17440. ISSN 1144-0546

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Official URL: https://doi.org/10.1039/c9nj03151k

Abstract

The nucleation and crystal growth of a nanoscale cesium pollucite aluminosilicate zeolite (ANA topology) from an organotemplate-free precursor suspension are reported. By using a new and reactive synthesis recipe (5.5SiO2 : 1Al2O3 : 6Cs2O : 140H2O), zeolite nanocrystals with higher Al content (Si/Al ratio = 2.12) are obtained within 120 min under mild conditions (180 °C), which is much faster and safer as compared to those previously reported. The solid initially experiences amorphous phase re-organization before nucleation, crystallization and crystal growth take place. The resulting Cs-pollucite nanocrystals (average size 55 nm) display a trapezohedron morphology. The nanocrystals are colloidally stabilized in water and they are very active in the base-catalyzed cyanoethylation of dipropylamine reaction, giving 89.6% conversion at 180 °C within 50 min. In addition, a high solid yield of nanocrystals (ca. 70%) is also achieved, thus offering a green pathway for synthesizing zeolite nanocrystals with high basicity on a large scale. © 2019 The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.

Item Type: Article
Uncontrolled Keywords: Zeolites; Synthesis (chemical); Organic template
Subjects: Q Science > Q Science (General)
Q Science > QD Chemistry
Q Science > QR Microbiology
Divisions: Faculty of Science > Institute of Biological Sciences
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 20 Feb 2020 01:03
Last Modified: 20 Feb 2020 01:03
URI: http://eprints.um.edu.my/id/eprint/23850

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