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High‐Flux Carbon Molecular Sieve Membranes for Gas Separation
Author(s) -
Richter Hannes,
Voss Hartwig,
Kaltenborn Nadine,
Kämnitz Susanne,
Wollbrink Alexander,
Feldhoff Armin,
Caro Jürgen,
Roitsch Stefan,
Voigt Ingolf
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201701851
Subject(s) - molecular sieve , carbonization , chemical engineering , membrane , carbon fibers , carbide derived carbon , materials science , amorphous carbon , hydrogen , permeance , gas separation , permeation , membrane reactor , propane , adsorption , chemistry , organic chemistry , amorphous solid , nanotechnology , carbon nanotube , carbon nanofiber , composite material , biochemistry , composite number , engineering
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 sp 2 hybridized carbon sheets as well as sp 3 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 m 3 (STP)/(m 2 hbar). 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.