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Downsizing AFX zeolite crystals to nanoscale by post-milling recrystallization method Hiroki Yamada, Takayuki Iida, Zhendong Liu, Yusuke Naraki, Koji Ohara, Shinji Kohara, Tatsuya Okubo, and Toru Wakihara Cryst. Growth Des., Just Accepted Manuscript • DOI: 10.1021/acs.cgd.6b00365 • Publication Date (Web): 22 Apr 2016 Downloaded from http://pubs.acs.org on April 26, 2016
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Downsizing AFX zeolite crystals to nanoscale by post-milling recrystallization method
Hiroki Yamada1, Takayuki Iida1, Zhendong Liu1, Yusuke Naraki2, Koji Ohara3, Shinji Kohara4, Tatsuya Okubo1 and Toru Wakihara1*
1) Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan 2) Inorganic Materials Research Laboratory, Tosoh Corporation, 4560 Kaiseicho, Shunan, Yamaguchi 746-8501, Japan 3) JASRI/SPring-8, Kouto 1-1-1, Sayo-cho, Sayo-gun Hyogo 679-5198, Japan 4) National Institute for Materials Science, Kouto 1-1-1, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
*Corresponding author: Toru Wakihara Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan Tel: +81-3-5841-7368; Fax: +81-3-5800-3806; E-mail:
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Abstract Downsizing zeolites to obtain nanosized crystals for circumventing problems regarding molecular diffusion is a critical method for enhancing their functionalities, and therefore, such approach has been a focus of great attention. Here we applied the post-milling recrystallization method for reducing the AFX aluminosilicate zeolite crystal sizes to the nanoscale. Highly crystalline AFX zeolite particles with crystal sizes smaller than 100 nm were obtained by the post-milling recrystallization method using the supernatant solution acquired during the preparation of the ingredient raw crystals used for the milling. The prepared AFX zeolite nanocrystals were found to possess better ion-exchange performance than micrometer-sized counterparts highlighting the improved accessibility of the cations inside the micropores.
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Introduction Zeolites are crystalline microporous aluminosilicate materials that have been widely used as catalysts, adsorbents, and ion-exchangers because of their favorable features such as ordered micropore structures, high hydrothermal stabilities, and large ion-exchange capacities1,2. Reduction of the zeolite crystal size down to the nanoscale (
