Synthesis of Mordenite Type Zeolite - Download PDF
Natural Zeolite Structural and ion-exchange properties - Format: PDF
Zeolite molecular sieves have found extensive applications in ion-exchange, separation and catalytic processes, particularly in the chemical and petroleum industries. Currently, the state-of-the-art in synthesis of high-silica zeolites involves the use of complex organic molecules to direct the formation of zeolitic materials with novel pore structures. While efforts towards preparation of new zeolites using organic molecules as structure-directing agents continues, synthesis of calcium and other alkaline-earth zeolites has not received much attention since the inception of the systematic investigation of zeolite synthesis some 35 years ago. Of the approximate 50 natural zeolites discovered to date, over 20% have eluded synthesis and another 10% have proven exceedingly difficult to synthesize at typical hydrothermal conditions. The overwhelming majority of these zeolites are calcium-dominant. The difficulty encountered in the synthesis of these alkaline-earth zeolites is in direct contrast to their natural occurrence as alteration products of volcanic glasses. Thus, the objective of this work is developing practical methodolgies for the synthesis of alkaline-earth zeolites.
Database of Zeolite Structures - IZA Structure Commission
The properties of the porous materials depend both on the pore structures and the chemistry of the framework. The continuously increasing demands for materials with highly specific chemical and physical properties as zeolites have inspired scientists to make new porous materials with unique structures .
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Zeolites have the ability to act as catalysts for chemical reactions which take place within the internal cavities. Essentially, zeolites have two properties which make them particularly suitable as starting materials for the preparation of catalysts :