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• W2002178071 abstract "During the last 15 years, organic quaternary species, ions and amines, have been extensively employed as ‘templating’ additives in both aluminosilicate and aluminophosphate molecular sieve syntheses. A ‘template theory’ was evolved to explain the structure-directing effect of these organic species. The charge distribution and the size and geometric shape of a template are believed to be the causes for structure-directing. Meanwhile, data available in the literature also strongly suggest that gel chemistry, i.e. hydroxyl ion concentration, Si02/Al2O3 ratio, temperature, etc., is extremely important. The basic questions to be answered by the ‘template theory’ are: (1) How can one template give rise to so many different structures? (2) How can so many templates, differing in size and shape, all direct the same structure? (3) On the other hand, why do certain structures not form in the absence of a specific template molecule? In this article we intend to carefully review much of the synthesis data available in the literature and to examine the importance of the basic gel chemistry as well as of the templating effect. Also, we want to explore the close relationship of these two effects in molecular sieve synthesis. Based on the data reviewed, we propose that during the hydrothermal synthesis of molecular sieves, both gel chemistry and template species can play important roles in the formation of a specific structure, but that templating becomes operative only in the environment of the right ‘gel chemistry’." @default.
• W2002178071 created "2016-06-24" @default.
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• W2002178071 date "1983-10-01" @default.
• W2002178071 modified "2023-10-10" @default.
• W2002178071 title "The role of organic molecules in molecular sieve synthesis" @default.
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• W2002178071 doi "https://doi.org/10.1016/0144-2449(83)90169-0" @default.
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