화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.19, No.2, 309-313, March, 2002
DOI10.1007/BF02698420  Export Citation
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 Kusakabe†, and Shigeharu Morooka
  • Department of Applied Chemistry, Kyushu University, Fukuoka 812-8581, Japan
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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.
Keywords:FAU-type Zeolite;Membrane;Ion Exchange;Gas Separation;Selectivity
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