Reverse-selective microporous membrane for gas separation

Ken Ichi Sawamura, Teruaki Izumi, Kiyotoshi Kawasaki, Shintaro Daikohara, Tetsu Ohsuna, Mitsuko Takada, Yasushi Sekine, Eiichi Kikuchi, Masahiko Matsukata*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


Reverse-selective membranes,through which bigger molecules selectively permeate, are attractive for developing chemical processes utilizing hydrogen because they can maintain the high partial pressure of hydrogen required for their further downstream utilization. Although several of these chemical processes are operated above 473 K, membranes with outstanding reverse-selective separation performance at these temperatures are still to be reported. Herein, we propose a new adsorption-based reverse-selective membrane that utilizes a Na cation occluded in a zeolitic framework. The membrane developed in this work, a compact Na+-exchanged ZSM-5 (NaZSM-5) type zeolite membrane, enables us to selectively permeate and separate bigger polar molecules, such as methanol and water, from a stream containing hydrogen, above 473 K. On the other hand, a Na+-free, H+-exchanged ZSM-5 (HZSM-5) type zeolite membrane did not show separation properties at these temperatures. The microporous zeolite membrane developed in this study can be applied to a variety of chemical reaction systems to minimize energy consumption.

Original languageEnglish
Pages (from-to)1070-1077
Number of pages8
JournalChemistry - An Asian Journal
Issue number7
Publication statusPublished - 2009 Jul 6


  • Gas separation
  • Membranes
  • Microporous materials
  • Transmission electron microscopy
  • Zeolites

ASJC Scopus subject areas

  • General Chemistry
  • Biochemistry
  • Organic Chemistry


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