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Korean Journal of Chemical Engineering

, Volume 19, Issue 2, pp 309–313 | Cite as

Separation of co2-ch4 and co2-n2 systems using ion-exchanged fau-type zeolite membranes with different si/al ratios

  • Yasuhisa Hasegawa
  • Takeshi Tanaka
  • Kaori Watanabe
  • Byeong-Heon Jeong
  • Katsuki KusakabeEmail author
  • Shigeharu Morooka
Article

Abstract

FAU-type zeolite membranes with different Si/Al ratios were hydrothermally synthesized on the outer surface of a porous α-Al2O3 support tube. The permeances of the membranes to CO2, CH4 and N2 were then measured at 308 K for single-component and equimolar binary systems. The separation properties were dependent on both the Si/Al ratio and the ion-exchange treatment. For single-component systems, a lower Si/Al ratio resulted in the incorporation of a larger number of Na+ ions. For a CO2-CH4 mixture, both CO2 permeances and CO2/CH4 selectivities were approximately half the values obtained for a binary CO2-N2 mixture. The highest selectivities, obtained using the NaX(1) zeolite membrane, were 28 for CO2/CH4 and 78 for CO2/N2. The RbY, RbX(1) and RbX(2) zeolite membranes showed larger CO2 permeances, compared with those of the original Na-type membranes. Ion-exchange with K+ ions was the most effective for the NaY zeolite membrane in that both the CO2 permeance and the CO2/CH4 selectivity were increased.

Key words

FAU-type Zeolite Membrane Ion Exchange Gas Separation Selectivity 

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Copyright information

© Korean Institute of Chemical Engineering 2002

Authors and Affiliations

  • Yasuhisa Hasegawa
    • 1
  • Takeshi Tanaka
    • 1
  • Kaori Watanabe
    • 1
  • Byeong-Heon Jeong
    • 1
  • Katsuki Kusakabe
    • 1
    Email author
  • Shigeharu Morooka
    • 1
  1. 1.Department of Applied ChemistryKyushu UniversityFukuokaJapan

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