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Dominance of heat transfer limitations in conventional sol-gel synthesis of LTA revealed by microcrystallization

Dominance of heat transfer limitations in conventional sol-gel synthesis of LTA revealed by... The non-classical nucleation and growth mechanism for hydrothermal zeolite synthesis is a complex convolution of thermodynamic phase transformations, kinetic chemical condensations, three-phase mass transfer and spatial-temporal thermal gradients. The process is typically studied in batch autoclaves heated with laboratory ovens before being scaled in high temperature batch crystallizers. The experimental and theoretical work presented here proposes that transport limitations dominate batch process syntheses. Thus, kinetically-controlled, scalable crystallization must be achieved for accurate elucidation of the underlying crystallization mechanism. A segmented microdroplet crystallizer is used to remove internal and external heat transfer gradients during the synthesis of LTA zeolite crystals. The heat transfer regimes are carefully mapped, and specific criteria are established for overcoming thermal limitations.Graphical abstract[graphic not available: see fulltext] http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Flow Chemistry Springer Journals

Dominance of heat transfer limitations in conventional sol-gel synthesis of LTA revealed by microcrystallization

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Publisher
Springer Journals
Copyright
Copyright © Akadémiai Kiadó 2022
ISSN
2062-249X
eISSN
2063-0212
DOI
10.1007/s41981-022-00217-1
Publisher site
See Article on Publisher Site

Abstract

The non-classical nucleation and growth mechanism for hydrothermal zeolite synthesis is a complex convolution of thermodynamic phase transformations, kinetic chemical condensations, three-phase mass transfer and spatial-temporal thermal gradients. The process is typically studied in batch autoclaves heated with laboratory ovens before being scaled in high temperature batch crystallizers. The experimental and theoretical work presented here proposes that transport limitations dominate batch process syntheses. Thus, kinetically-controlled, scalable crystallization must be achieved for accurate elucidation of the underlying crystallization mechanism. A segmented microdroplet crystallizer is used to remove internal and external heat transfer gradients during the synthesis of LTA zeolite crystals. The heat transfer regimes are carefully mapped, and specific criteria are established for overcoming thermal limitations.Graphical abstract[graphic not available: see fulltext]

Journal

Journal of Flow ChemistrySpringer Journals

Published: Apr 7, 2022

Keywords: Hydrothermal; Zeolite; Synthesis; Microdroplet; Mixing

References