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https://doi.org/10.1016/j.micromeso.2007.11.038
Title: | Exploratory development of dual-layer carbon-zeolite nanocomposite hollow fiber membranes with high performance for oxygen enrichment and natural gas separation | Authors: | Li, Y. Chung, T.-S. |
Keywords: | Carbon-zeolite nanocomposite Dual-layer hollow fiber membranes Molecular sieving mechanism Natural gas separation Oxygen enrichment |
Issue Date: | 1-Aug-2008 | Citation: | Li, Y., Chung, T.-S. (2008-08-01). Exploratory development of dual-layer carbon-zeolite nanocomposite hollow fiber membranes with high performance for oxygen enrichment and natural gas separation. Microporous and Mesoporous Materials 113 (1-3) : 315-324. ScholarBank@NUS Repository. https://doi.org/10.1016/j.micromeso.2007.11.038 | Abstract: | A type of novel precursor, namely dual-layer polyethersulfone (PES)-zeolite beta/BTDA-TDI/MDI co-polyimide (P84) composite hollow fibers, was applied to fabricate the dual-layer carbon-zeolite nanocomposite hollow fiber membranes through pyrolysis in this work. After pyrolysis at 800 °C, these newly developed nanocomposite hollow fibers exhibit a significantly enhanced O2/N2 and CO2/CH4 selectivity of 11.3 and 152, respectively, in the pure gas measurement, and meanwhile, they also show a comparable CO2/CH4 selectivity of 140 in the mixed gas measurement. TGA curves indicate that the presence of zeolite beta may assist the formation of carbon-zeolite nanocomposite structure in the outer layer and both outer layer and inner layer inside the dual-layer hollow fibers may experience a delayed decomposition pattern during pyrolysis compared with their corresponding single-layer membranes. After pyrolysis at 800 °C, X-ray diffraction (XRD) patterns suggest that the monolayer graphite sheets have been formed in the outer-layer carbon matrix with a d-space of 3.73 Å, scanning electron microscope (SEM) images reveal a uniform and compact dispersion of zeolite particles in the outer-layer carbon matrix, and both XRD patterns and energy dispersion of X-ray (EDX) data demonstrate the integrity of zeolite beta by an analysis of the crystalline structure and elemental composition. These above-mentioned characterizations support a conjecture from various aspects that a combining effect of carbon molecular sieve (CMS) and zeolite materials results in a remarkable improvement of dual-layer hollow fiber membranes in the performance of oxygen enrichment and natural gas separation through the molecular sieving mechanism. © 2007 Elsevier Inc. All rights reserved. | Source Title: | Microporous and Mesoporous Materials | URI: | http://scholarbank.nus.edu.sg/handle/10635/88882 | ISSN: | 13871811 | DOI: | 10.1016/j.micromeso.2007.11.038 |
Appears in Collections: | Staff Publications |
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