High-Flux Carbon Molecular Sieve Membranes for Gas Separation |
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| Authors: | Dr. Hannes Richter Hartwig Voss Nadine Kaltenborn Susanne Kämnitz Alexander Wollbrink Armin Feldhoff Prof. Dr. Jürgen Caro Stefan Roitsch Dr. Ingolf Voigt |
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| Affiliation: | 1. Fraunhofer Institute for Ceramic Technologies and Systems, IKTS-Hermsdorf branch, Michael-Faraday-Strasse 1, 07629 Hermsdorf, Germany;2. BASF SE, Membrane Separation Processes, GCP/TC—L 540, 67056 Ludwigshafen, Germany;3. Leibniz University Hannover, Institute for Physical Chemistry and Electrochemistry, Callinstrasse 3A, 30167 Hannover, Germany;4. University of Köln, Institute of Physical Chemistry, Luxemburger Strasse 116, 50939 Köln, Germany |
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| Abstract: | Carbon membranes have great potential for highly selective and cost-efficient gas separation. Carbon is chemically stable and it is relative cheap. The controlled carbonization of a polymer coating on a porous ceramic support provides a 3D carbon material with molecular sieving permeation performance. The carbonization of the polymer blend gives turbostratic carbon domains of randomly stacked together sp2 hybridized carbon sheets as well as sp3 hybridized amorphous carbon. In the evaluation of the carbon molecular sieve membrane, hydrogen could be separated from propane with a selectivity of 10 000 with a hydrogen permeance of 5 m3(STP)/(m2hbar). Furthermore, by a post-synthesis oxidative treatment, the permeation fluxes are increased by widening the pores, and the molecular sieve carbon membrane is transformed from a molecular sieve carbon into a selective surface flow carbon membrane with adsorption controlled performance and becomes selective for carbon dioxide. |
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| Keywords: | carbon membranes carbon dioxide gas separation molecular sieves polymer carbonization |
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