Dual-layer hollow carbon fiber membranes for gas separation consisting of carbon and mixed matrix layers
Dual-layer hollow carbon fiber membranes for gas separation consisting of carbon and mixed matrix layers
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DOI：
10.1016/j.carbon.2006.07.008
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发表时间：
2007-01-01
期刊：
影响因子：
10.9
通讯作者：
Rajagopalan, Raj
中科院分区：
文献类型：
--
作者：
Jiang, Lan Ying;Chung, Tai-Shung;Rajagopalan, Raj
利用一种特殊的前驱体，首次成功制备了中空碳纤维气体分离膜。该前驱体是由聚砜-沸石（psf - β）混合基质外层和基质内层组成的双层中空纤维。纯气体渗透测试表明，所得中空碳纤维的O-2/N-2和CO2/CH4选择性分别为9.3和150；这一性能远远优于由单层Matrimid中空纤维衍生而来的中空碳纤维。混合气体测量表明，CO2/CH4选择性为128。热解后，双层前驱体中的PSF- β层演化为嵌套在PSF炭渣中的紧密排列的沸石颗粒的连续结构。TGA光谱分析表明，上述现象的可能原因是psf - β外层和Matrimid内层显著改变了彼此的热解动力学和热降解过程。(c) 2006 Elsevier Ltd.版权所有。
Hollow carbon fiber membranes for gas separation have been successfully fabricated for the first time by a special type of precursor. This precursor is dual-layer hollow fiber composed of a polysulfone-beta zeolite (PSF-beta) mixed matrix outer layer and a Matrimid inner layer. Pure gas permeation measurements show that the resultant hollow carbon fiber has O-2/N-2 and CO2/CH4 selectivities of 9.3 and 150, respectively; this performance is much better than that of the hollow carbon fiber derived from single-layer Matrimid hollow fiber. Mixed gas measurements show the CO2/CH4 selectivity of 128. After pyrolysis, the PSF-beta layer in the dual-layer precursor evolves into a continuous structure of closely packed zeolite particles embedded in the PSF carbon residue. TGA spectra suggest that the possible reason for the above observation is that the PSF-beta outer layer and Matrimid inner layer has significantly changed each other's pyrolysis dynamics and thermal degradation process. (c) 2006 Elsevier Ltd. All rights reserved.