Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 113, Issue 50, Pages 14267-14271Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1615872113
Keywords
crystal growth; continuous flow synthesis; zeolites; ultrafast synthesis; ZSM-5
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Funding
- New Energy and Industrial Technology Development Organization
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The hydrothermal synthesis of zeolites carried out in batch reactors takes a time so long (typically, on the order of days) that the crystallization of zeolites has long been believed to be very slow in nature. We herein present a synthetic process for ZSM-5, an industrially important zeolite, on the order of seconds in a continuous flow reactor using pressurized hot water as a heating medium. Direct mixing of a well-tuned precursor (90 degrees C) with the pressurized water preheated to extremely high temperature (370 degrees C) in the millimeter- sized continuous flow reactor resulted in immediate heating to high temperatures (240-300 degrees C); consequently, the crystallization of ZSM-5 in a seed-free system proceeded to completion within tens of or even several seconds. These results indicate that the crystallization of zeolites can complete in a period on the order of seconds. The subtle design combining a continuous flow reactor with pressurized hot water can greatly facilitate the mass production of zeolites in the future.
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