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Synthesis of Sodalite from Water Glass: Effect of the Composition of Synthetic Mixtures on Its Crystallinity and Crystallite Size  

Bae, Song Eun (School of Applied Chemical Engineering and the Institute for Catalysis Research, Chonnam National University)
Seo, Gon (School of Applied Chemical Engineering and the Institute for Catalysis Research, Chonnam National University)
Song, Mee Kyung (Bioinformatics and Molecular Design Research Center)
No, Kyoung Tai (Department of Biotechnology, Yonsei University)
Publication Information
Korean Chemical Engineering Research / v.47, no.4, 2009 , pp. 424-429 More about this Journal
Abstract
The effects of $Na_2O$, $SiO_2$ and $H_2O$ contents of the synthetic mixtures prepared from water glass on the crystallinity and crystallite size of sodalite were studied. The composition of the synthetic mixtures described by $x\;Na_2O{\cdot}y\;SiO_2{\cdot}Al_2O_3{\cdot}z\;H_2O$ was varied within x=2.5~7.5, y=1.4~3.0, z=140~400. The hydrothermal reaction was carried out at $140^{\circ}C$ for 2 days. High content of $Na_2O$ resulted in the high crystallinity and small crystallite of sodalite. The $SiO_2/Al_2O_3$ molar ratios of around 2 were suitable for the synthesis of sodalite, and produced zeolite species were varied by the $H_2O$ content. Sodalite was mainly obtained with a high crystallinity from the synthetic mixtures with $SiO_2/Al_2O_3$ molar ratio of around 2 and high content of $Na_2O$. The high content of sodium ions caused a decrease in the particle sizes because of their role of structure directing agent.
Keywords
Sodalite; Water Glass; Synthesis; Crystallinity; Crystallite Size;
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