Abstract
This article reviews historical trends in the use of organic structure-directing agents (SDA) for the syntheses of high-silica zeolites. Methods for the preparation of amines and quaternary ammonium molecules are illustrated with examples of known SDA molecules. Recent developments in the synthesis of zeolites are described: synthesis in concentrated fluoride media, synthesis of germanosilicate zeolites, synthesis in ionothermal media, synthesis using the concept of charge density mismatch, and synthesis with “recyclable” SDA molecules. Examples are also provided that illustrate how molecular modeling is used to understand the structure-directing effects of SDA molecules.
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