Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 40, Issue 16, Pages 5653-5663Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2015.02.112
Keywords
Carbon membranes; Composite membranes; Gas separation; Nanoparticles; Phenolic resin; Novolac
Categories
Funding
- Portuguese Foundation for Science and Technology (FCT) [SFRH/BD/61898/2009, SFRH/BD/24768/2005]
- FCT [REEQ/1062/CTM/2005, REDE/1512/RME/2005]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/24768/2005, SFRH/BD/61898/2009] Funding Source: FCT
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Supported composite alumina-carbon molecular sieve membranes (c-CMSM) were prepared from in house prepared novolac phenolic resin loaded with boehmite nanoparticles in a single dipping-drying-carbonization step. A porous a-alumina tube support was dipped into a N-methyl-2-pyrrolidone solution containing polymerized novolac resin loaded with boehmite, subsequently dried at 100 degrees C and carbonized at 500 degrees C under nitrogen environment. The structure, morphology and performance of the membranes were examined by scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), carbon dioxide adsorption and permeation of N-2, O-2, He, H-2 and CO2. SEM showed carbon membranes with a thin and very uniform layer with a thickness of ca. 3 mu m CO2 adsorption isotherms indicated that the produced carbon membranes presented a microporous structure. The c-CMSM exhibited good gas separation properties. The permselectivity surpass the Robeson upper bound for polymeric membranes, especially regarding ideal permselectivities of pairs H-2/N-2 = 117, and He/O-2 = 49. Aging effects were observed after membrane exposure to ambient air. However with a thermal treatment under nitrogen atmosphere the permeance of nitrogen increases. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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