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Membranes 2019, 9(4), 46; https://doi.org/10.3390/membranes9040046

Effects of Silica-Particle Coating on a Silica Support for the Fabrication of High-Performance Silicalite-1 Membranes by Gel-Free Steam-Assisted Conversion

1
Department of Oral Biochemistry, Division of Oral Structure, Function and Development, Asahi University School of Dentistry, 1851 Hozumi, Mizuho, Gifu 501-0296, Japan
2
Faculty of Engineering, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
3
Research Institute for Chemical Process Technology, National Institute of Advanced Industrial Science and Technology (AIST), AIST Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
4
Frontier Technologies Laboratory, Sumitomo Electric Industries, Ltd., 1, Taya-cho, Sakae-ku, Yokohama, Kanagawa 244-8588, Japan
5
Organization for Research and Community Development, 1-1 Yanagido, Gifu 501-1193, Japan
*
Author to whom correspondence should be addressed.
Received: 26 February 2019 / Revised: 26 March 2019 / Accepted: 27 March 2019 / Published: 1 April 2019
(This article belongs to the Special Issue Zeolitic Membranes: Advances and Applications)
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Abstract

Silicalite-1 membranes with high pervaporation performance were prepared successfully on a silica-particle-coated tubular silica support using a gel-free steam-assisted conversion (SAC) method. The effects of the silica-particle layer formed on the top surface of the silica support and the physical properties of the silica particles themselves on the membrane-formation process were investigated. The silica particles coated served as the additional silica source for growing the silicalite-1 seed crystal layer into the silicalite-1 membrane. As a result, it was possible to form a dense and continuous membrane even under gel-free conditions. Furthermore, it was found that the properties of the silica particles, such as their primary particle diameter, had a determining effect on their solubility during the steam treatment, that is, on the supply rate of the silica source. The silicalite-1 membrane obtained using the spherical-silica-particle-coated support had an approximately 9-μm-thick separation layer and showed very high pervaporation performance, exhibiting a separation factor of 105 and a flux of 3.72 kg m−2 h−1 for a 10 wt % ethanol/water mixture at 323 K. Thus, the gel-free SAC method can be used with a silica support coated with silica particles to readily prepare high-performance membranes without producing any chemical waste. View Full-Text
Keywords: MFI-type zeolite; silicalite-1 membrane; electrophoretic deposition; tubular silica support; silica particles; gel-free synthesis; steam-assisted conversion; secondary growth; ethanol/water separation; pervaporation MFI-type zeolite; silicalite-1 membrane; electrophoretic deposition; tubular silica support; silica particles; gel-free synthesis; steam-assisted conversion; secondary growth; ethanol/water separation; pervaporation
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Ueno, K.; Negishi, H.; Okuno, T.; Tawarayama, H.; Ishikawa, S.; Miyamoto, M.; Uemiya, S.; Oumi, Y. Effects of Silica-Particle Coating on a Silica Support for the Fabrication of High-Performance Silicalite-1 Membranes by Gel-Free Steam-Assisted Conversion. Membranes 2019, 9, 46.

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