Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 35, Pages 11283-11288Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201805877
Keywords
amorphous precursors; intercrystalline transformation; nonclassical crystallization; potassium; zeolite L
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Funding
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0014468]
- Welch Foundation [E-1794]
- University of Alicante [GRE15-07]
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The preparation of nanosized zeolites is critical for applications where mass-transport limitations within microporous networks hinder their performance. Often the ability to generate ultrasmall zeolite crystals is dependent upon the use of expensive organics with limited commercial relevance. Herein, we report the generation of zeoliteL crystals with uniform sizes less than 30nm using a facile, organic-free method. Time-resolved analysis of precursor assembly and evolution during nonclassical crystallization highlights key differences among silicon sources. Our findings reveal that a homogenous dispersion of potassium ions throughout silicate precursors leads to the formation of a metastable nonporous phase, which undergoes an intercrystalline transformation to zeoliteL. The generation of highly interdispersed alkali-silicate precursors is seemingly critical to enhancing the rate of nucleation and facilitating the formation of ultrasmall crystal.
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