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Mechanism of Gas Separation through Amorphous Silicon Oxycarbide Membranes

Prasad, Ravi Mohan and Jüttke, Yvonne and Richter, Hannes and Voigt, Ingolf and Riedel, Ralf and Gurlo, Aleksander (2016):
Mechanism of Gas Separation through Amorphous Silicon Oxycarbide Membranes.
In: Advanced Engineering Materials, WILEY-V C H VERLAG GMBH, Weinheim, pp. 721-727, 18, (5), ISSN 14381656,
[Online-Edition: http://doi.org/10.1002/adem.201500380],
[Article]

Abstract

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 gamma-Al2O3/a-Al2O3 substrates with gradient porosity are threefold coated by vinyl-functionalized polysiloxane and pyrolyzed at 700 degrees C under argon. N-2-physisorption measurement confirms formation of microporous material with a specific surface area of about 400 m(2) g(-1). Single gas permeance characterization of the SiOC membrane at 300 degrees C reveals H-2/CO2 and H-2/SF6 ideal permselectivities of about 10 and 320, respectively. The experimental gas permeance data are modeled using solid-state diffusion (for He and H-2) and gas translational diffusion (for CO2 and SF6) mechanisms.

Item Type: Article
Erschienen: 2016
Creators: Prasad, Ravi Mohan and Jüttke, Yvonne and Richter, Hannes and Voigt, Ingolf and Riedel, Ralf and Gurlo, Aleksander
Title: Mechanism of Gas Separation through Amorphous Silicon Oxycarbide Membranes
Language: English
Abstract:

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 gamma-Al2O3/a-Al2O3 substrates with gradient porosity are threefold coated by vinyl-functionalized polysiloxane and pyrolyzed at 700 degrees C under argon. N-2-physisorption measurement confirms formation of microporous material with a specific surface area of about 400 m(2) g(-1). Single gas permeance characterization of the SiOC membrane at 300 degrees C reveals H-2/CO2 and H-2/SF6 ideal permselectivities of about 10 and 320, respectively. The experimental gas permeance data are modeled using solid-state diffusion (for He and H-2) and gas translational diffusion (for CO2 and SF6) mechanisms.

Journal or Publication Title: Advanced Engineering Materials
Volume: 18
Number: 5
Publisher: WILEY-V C H VERLAG GMBH, Weinheim
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 19 May 2017 11:10
Official URL: http://doi.org/10.1002/adem.201500380
Identification Number: doi:10.1002/adem.201500380
Funders: DFG - German Research Foundation : Grant Number GU 992/3-2 and VO 1705/1-2 .
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