Zeolites play many important roles in energy and environment-related fields as catalysts, adsorbents, ion-exchangers and so on. The synthesis of zeolites has been brushed up to broaden the framework types, and driven the applications. In order to go further, the conventional ideas of the synthesis need to be reconsidered.In this invited talk, two examples realized by seed-assisted approaches will be introduced. One is the synthesis of zeolites without the use of organic structure-directing agents (OSDAs). Some of zeolites had been believed that OSDAs must be employed for the synthesis. With the help of the seed crystals, OSDA-free syntheses of more than ten zeolites have been achieved. The other is the minute-order synthesis of zeolites. Zeolites have been synthesized by hydrothermal reaction over several hours or even several days to weeks. By combining fast heating with seed addition, the synthesis can be achieved within several to several tens minutes.These examples show that there still remain several feasible routes for the rational synthesis of zeolites.

Seed-assisted approaches realizing OSDA-free and minute-order syntheses of zeolites

247th National Meeting (2014)

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