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Reverse‐Selective Microporous Membrane for Gas Separation
Author(s) -
Sawamura Kenichi,
Izumi Teruaki,
Kawasaki Kiyotoshi,
Daikohara Shintaro,
Ohsuna Tetsu,
Takada Mitsuko,
Sekine Yasushi,
Kikuchi Eiichi,
Matsukata Masahiko
Publication year - 2009
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.200900048
Subject(s) - membrane , microporous material , zeolite , chemical engineering , permeation , hydrogen , adsorption , chemistry , membrane technology , gas separation , molecule , selective adsorption , methanol , materials science , organic chemistry , catalysis , biochemistry , engineering
Sort the bigs from the smalls : Reverse‐selective membranes, through which bigger molecules selectively permeate, are attractive for developing chemical processes. A new adsorption‐based reverse‐selective membrane that utilizes a Na cation occluded in a zeolitic framework is presented. The membrane developed enables the selective permeation and separation of bigger polar molecules, such as methanol and water, from hydrogen above 473 K.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.