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Mechanism of gas separation through amorphous silicon oxycarbide membranes 

: Prasad, Ravi Mohan; Jüttke, Yvonne; Richter, Hannes; Voigt, Ingolf; Riedel, Ralf; Gurlo, Aleksander


Advanced engineering materials 18 (2016), Nr.5, S.721-727
ISSN: 1438-1656
ISSN: 1615-7508
Deutsche Forschungsgemeinschaft DFG
GU 992/3-2
Thermoresistant ceramic membrane with integrated gas sensor for high temperature separation and detection of hydrogen and carbon monoxide
Fraunhofer IKTS ()
Membran; Gasseparation; hydrogen separation; gas separation; membrane

Polymer-derived amorphous silicon oxycarbide (SiOC) ceramics are designed for hydrogen separation at high temperatures. To form amorphous SiOC top-coating with the thickness of about 300 nm, tubular porous γ-Al2O3/α-Al2O3 substrates with gradient porosity are threefold coated by vinyl-functionalized polysiloxane and pyrolyzed at 700 °C under argon. N2-physisorption measurement confirms formation of microporous material with a specific surface area of about 400 m2 g–1. Single gas permeance characterization of the SiOC membrane at 300 °C reveals H2/CO2 and H2/SF6 ideal permselectivities of about 10 and 320, respectively. The experimental gas permeance data are modeled using solid-state diffusion (for He and H2) and gas translational diffusion (for CO2 and SF6) mechanisms.