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Synthesis of zeolite A membranes on alumina support by hydrothermal reaction  

Ko, Tae-Seog (Department of Jewelry Design and Metalsmithing, Dongshin University)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.17, no.3, 2007 , pp. 95-101 More about this Journal
Abstract
The synthesis of NaA zeolite membrane on a porous alumina support from clear solution by using hydrothermal reaction was investigated. Effects of reaction temperature, reaction time and seeding for transformation of zeolite A membrane and powder which are produced in the reactor were monitored through X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM). The transformation process of producing Zeolite A membrane starts from the formation of the compact and continuous membrane on the surface of porous support from clear solution. The large Zeolite A poly-crystal was then farmed through the dissolution process. Finally, the process was advanced from sodalite to amorphous. In case of powder, sodalite is formed in the early stage of reaction because of surrounding space difference between membrane and powder crystal. Discrete surrounding space of powder crystal makes easy to transform to sodalite. From Zeolite A to amorphous through transformed product was rapidly advanced at high temperature while the membrane with somewhat low coverage was obtained at low temperature. A compact and continuous zeolite A membrane was synthesized at $120^{\circ}C$ in 12-hour period.
Keywords
Hydrothermal synthesis; Zeolite A membrane; Seeding; Membrane formation;
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