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  • Title: Continuous flow synthesis of ZSM-5 zeolite on the order of seconds.
    Author: Liu Z, Okabe K, Anand C, Yonezawa Y, Zhu J, Yamada H, Endo A, Yanaba Y, Yoshikawa T, Ohara K, Okubo T, Wakihara T.
    Journal: Proc Natl Acad Sci U S A; 2016 Dec 13; 113(50):14267-14271. PubMed ID: 27911823.
    Abstract:
    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 °C) with the pressurized water preheated to extremely high temperature (370 °C) in the millimeter-sized continuous flow reactor resulted in immediate heating to high temperatures (240-300 °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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