Gas permeation properties of ion-exchanges faujasite-type zeolite membranes
- Kyushu Univ., Fukuoka (Japan). Dept. of Materials Physics and Chemistry
NaY-type zeolite membranes were synthesized on a porous support tube by a hydrothermal process. The membranes were ion-exchanged with Li{sup +} and K{sup +} ions, and permeances through the membranes were determined for an equimolar mixture of CO{sub 2} and N{sub 2}, as well as for single-components thereof, at a temperature range of 0--400 C. The permeance to CO{sub 2} showed a maximum at 100 C, but CO{sub 2}/N{sub 2} selectivity decreased with increasing temperature. The zeolite membranes that were exchanged with K{sup +} and Li{sup +} ions gave higher and lower CO{sub 2}/N{sub 2} selectivities, respectively, than were found for the NaY-type membrane. The permeation properties of the ion-exchanged zeolite membranes were analyzed using a sorption-diffusion model. The high CO{sub 2}/N{sub 2} selectivity of the K-exchanged membranes can be explained by the decrease in N{sub 2} sorptivity for the mixed feed.
- OSTI ID:
- 362052
- Journal Information:
- AIChE Journal, Vol. 45, Issue 6; Other Information: PBD: Jun 1999
- Country of Publication:
- United States
- Language:
- English
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