Amine-Appended Hierarchical Ca-A Zeolite for Enhancing CO₂/CH₄ Selectivity of Mixed-Matrix Membranes

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• 作者：Dr. Tien Hoa Nguyen ; Heqing Gong ; Dr. Siew Siang Lee and Prof. Dr. Tae-Hyun Bae
• 刊名：ChemPhysChem
• 出版年：2016
• 出版时间：October 18, 2016
• 年：2016
• 卷：17
• 期：20
• 页码：3165-3169
• 全文大小：1206K
• ISSN：1439-7641

文摘

An amine-appended hierarchical Ca-A zeolite that can selectively capture CO₂ was synthesized and incorporated into inexpensive membrane polymers, in particular polyethylene oxide and Matrimid, to design mixed-matrix membranes with high CO₂/CH₄ selectivities. Binary mixture permeation testing reveals that amine-appended mesoporous Ca-A is highly effective in improving CO₂/CH₄ selectivity of polymeric membranes. In particular, the CO₂/CH₄ selectivity of the polyethylene oxide membrane increases from 15 to 23 by incorporating 20 wt % amine-appended Ca-A zeolite. Furthermore, the formation of filler/polymer interfacial defects, which is typically found in glassy polymer-zeolite pairs, is inhibited owing to the interaction between the amine groups on the external surface of zeolites and polymer chains. Our results suggest that the amine-appended hierarchial Ca-A, which was utilized in membrane fabrication for the first time, is a good filler material for fabricating a CO₂-selective mixed-matrix membrane with defect-free morphology.