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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
Source: 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.
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
ISSN: 13871811
DOI: 10.1016/j.micromeso.2007.11.038
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