Bendable Zeolite Membranes: Synthesis and Improved Gas Separation Performance

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• 作者：Bo Wang ; W. S. Winston Ho ; Jose D. Figueroa ; Prabir K. Dutta
• 刊名：Langmuir
• 出版年：2015
• 出版时间：June 23, 2015
• 年：2015
• 卷：31
• 期：24
• 页码：6894-6901
• 全文大小：520K
• ISSN：1520-5827

文摘

Separation and sequestration of CO₂ emitted from fossil energy fueled electric generating units and industrial facilities will help in reducing anthropogenic CO₂, thereby mitigating its adverse climate change effects. Membrane-based gas separation has the potential to meet the technical challenges of CO₂ separation if high selectivity and permeance with low costs for large-scale manufacture are realized. Inorganic zeolite membranes in principle can have selectivity and permeance considerably higher than polymers. This paper presents a strategy for zeolite growth within the pores of a polymer support, with crystallization time of an hour. With a thin coating of 200鈥?00 nm polydimethylsiloxane (PDMS) on the zeolite鈥損olymer composite, transport data for CO₂/N₂ separation indicate separation factors of 35鈥?5, with CO₂ permeance between 1600 and 2200 GPU (1 GPU = 3.35 脳 10^鈥?0 mol/(m² s Pa)) using dry synthetic mixtures of CO₂ and N₂ at 25 掳C. The synthesis process results in membranes that are highly reproducible toward transport measurements and exhibit long-term stability (3 days). Most importantly, these membranes because of the zeolite growth within the polymer support, as contrasted to conventional zeolite growth on top of a support, are mechanically flexible.