Synthesis of Defect-Free FAU-Type Zeolite Membranes and Separation for Dry and Moist CO2/N2 Mixtures
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- 作者：Xuehong Gu ; Junhang Dong ; and Tina M. Nenoff
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2005
- 出版时间：February 16, 2005
- 年：2005
- 卷：44
- 期：4
- 页码：937 - 944
- 全文大小：583K
- 年卷期：v.44,no.4(February 16, 2005)
- ISSN：1520-5045
文摘
In this paper, the effects of synthesis conditions, including the seeding approach, gel composition,and hydrothermal treatment process, on the quality of porous 
-alumina-supported Y-type FAUmembranes were studied. Defect-free, pure NaY-type zeolite membranes have been synthesizedand investigated for separation of equimolar CO2/N2 mixtures under dry and moist conditionsat atmospheric pressure. At room temperature, the CO2 selectivity was about 31.2 for the CO2/N2 dry gas mixture with a CO2 permeance of 2.1 × 10-8 mol/m2·Pa·s. The addition of watervapor to the feed stream decreased the permeance for both CO2 and N2 in a temperature rangeof 23-200 
C. The existence of water vapor significantly enhanced the CO2 selectivity at 110-200 C but drastically lowered the CO2 selectivity below 80 C. At 200 C, with increasing waterpartial pressure, the CO2 selectivity increased and then decreased after reaching a maximumof 4.6 at a water partial pressure of 12.3 kPa.
-alumina-supported Y-type FAUmembranes were studied. Defect-free, pure NaY-type zeolite membranes have been synthesizedand investigated for separation of equimolar CO2/N2 mixtures under dry and moist conditionsat atmospheric pressure. At room temperature, the CO2 selectivity was about 31.2 for the CO2/N2 dry gas mixture with a CO2 permeance of 2.1 × 10-8 mol/m2·Pa·s. The addition of watervapor to the feed stream decreased the permeance for both CO2 and N2 in a temperature rangeof 23-200 C. The existence of water vapor significantly enhanced the CO2 selectivity at 110-200 C but drastically lowered the CO2 selectivity below 80 C. At 200 C, with increasing waterpartial pressure, the CO2 selectivity increased and then decreased after reaching a maximumof 4.6 at a water partial pressure of 12.3 kPa.