Composite-alumina-carbon molecular sieve membranes prepared from novolac resin and boehmite. Part I: Preparation, characterization and gas permeation studies
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2015-05-04
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PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
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Abstract
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 C and carbonized at 500 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 N2, O2, He, H2 and CO2. SEM showed
carbon membranes with a thin and very uniform layer with a thickness of ca. 3 mm 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 H2/N2 ¼ 117, and He/O2 ¼ 49. Aging effects were observed
after membrane exposure to ambient air. However with a thermal treatment under nitrogen
atmosphere the permeance of nitrogen increases.
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Keywords
Carbon membranes, Composite Membranes, Gas separation, Nanoparticles, Phenolic resins, Novolac
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journal article
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International journal o f hydrogen energy 40 ( 2015 ) 5653 - 5663