Continuous flow synthesis of ZSM-5 zeolite on the order of seconds

作者：Liu Zhendong; Okabe Kotatsu; Anand Chokkalingam; Yonezawa Yasuo; Zhu Jie; Yamada Hiroki; Endo Akira; Yanaba Yutaka; Yoshikawa Takeshi; Ohara Koji; Okubo Tatsuya; Wakihara Toru^*

来源：Proceedings of the National Academy of Sciences, 2016, 113(50): 14267-14271.

DOI：10.1073/pnas.1615872113

• crystal growth
• continuous flow synthesis
• zeolites
• ultrafast synthesis
• ZSM-5

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.

• 出版日期2016-12-13