Potential of C-plane Aligned Hexagonal Tungsten Oxide Film as a Molecular Sieve-type Separation Membrane

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  • Hagio Takeshi
    Institute of Materials Innovation, Institutes of Innovation for Future Society, Nagoya University Department of Chemical Systems Engineering, Graduate School of Engineering, Nagoya University
  • Kunishi Hiroto
    Department of Chemical Systems Engineering, Graduate School of Engineering, Nagoya University
  • Wada Shintaro
    Department of Chemical Systems Engineering, Graduate School of Engineering, Nagoya University
  • Terao Toshihiro
    Department of Chemical Systems Engineering, Graduate School of Engineering, Nagoya University
  • Kinoshita Sora
    Department of Chemical Systems Engineering, Graduate School of Engineering, Nagoya University
  • Phouthavong Vanpaseuth
    Department of Chemical Systems Engineering, Graduate School of Engineering, Nagoya University Department of Chemistry, Faculty of Natural Sciences, National University of Laos
  • Nijpanich Supinya
    Department of Chemical Systems Engineering, Graduate School of Engineering, Nagoya University Synchrotron Light Research Institute (Public Organization)
  • Park Jae-Hyeok
    Institute of Materials Innovation, Institutes of Innovation for Future Society, Nagoya University
  • Ichino Ryoichi
    Institute of Materials Innovation, Institutes of Innovation for Future Society, Nagoya University Department of Chemical Systems Engineering, Graduate School of Engineering, Nagoya University

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Other Title
  • c面配向六方晶酸化タングステン膜の分子ふるい型分離膜としての可能性
  • cメンハイコウ ロッポウショウサンカ タングステンマク ノ ブンシ フルイ カタ ブンリマク ト シテ ノ カノウセイ

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Abstract

Separation membranes are attracting increasing attention because they can contribute to realizing a carbon neutral and sustainable society through energy reduction of energy-consuming separation processes and through recycling of resources. Among numerous research elements on this topic, research on membrane materials is one topic of importance because it determines their separation characteristics. A group of inorganic crystals with molecular-sized micropores (microporous inorganic crystals), also called molecular sieves, are promising separation membrane material candidates. Among them, the authors have proposed hexagonal tungsten oxide as a potential molecular sieve-type membrane material. Because this material possesses uniaxial pores parallel to its crystallographic c-axis, c-plane oriented hexagonal tungsten oxide membrane is expected to function as a molecular sieve type-separation membrane; however, its application as a separation membrane material has not been considered. Here, we introduce our recent attempts on challenging to synthesize dense c-plane oriented hexagonal tungsten oxide film, and the experimental results seeking its possibility to apply as liquid/liquid and/or gas/gas separation membranes. The obtained membrane was confirmed to selectively separate water from a water/acetic acid mixture. Furthermore, results on the permeability of various liquids and gas molecules implied that the membrane functions as a molecular sieve-type separation membrane for small molecules through utilization of its micropores. This discovery is expected to contribute to expanding options for membrane materials.

Journal

  • ゼオライト

    ゼオライト 41 (1), 9-19, 2024-01-30

    Japan Association of Zeolite

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