Design and optimization of porous ceramic supports for asymmetric ceria-based oxygen transport membranes

The microstructure, mechanical properties and gas permeability of porous supports of Ce0.9Gd0.1O1.95−δ (CGO) were investigated as a function of sintering temperature and volume fraction of pore former for use in planar asymmetric oxygen transport membranes (OTMs). With increasing the pore former con...

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Bibliographic Details
Published in:Journal of membrane science 2016-09, Vol.513, p.85-94
Main Authors: Kaiser, A., Foghmoes, S.P., Pećanac, G., Malzbender, J., Chatzichristodoulou, C., Glasscock, J.A., Ramachandran, D., Ni, De Wei, Esposito, V., Søgaard, M., Hendriksen, P.V.
Format: Article
Language:English
Subjects:
Asymmetry
Ceramic support
Co-firing
Gas permeability
Mechanical properties
Membranes
Microstructure
Oxygen
Oxygen transport membrane
Permeability
Porosity
Sintering (powder metallurgy)
Transport
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Summary:The microstructure, mechanical properties and gas permeability of porous supports of Ce0.9Gd0.1O1.95−δ (CGO) were investigated as a function of sintering temperature and volume fraction of pore former for use in planar asymmetric oxygen transport membranes (OTMs). With increasing the pore former content from 11vol% to 16vol%, the gas permeabilities increased by a factor of 5 when support tapes were sintered to comparable densities. The improved permeabilities were due to a more favourable microstructure with larger interconnected pores at a porosity of 45% and a fracture strength of 47±2MPa (m=7). The achieved gas permeability of 2.25×10−15m2 for a 0.4mm thick support will not limit the gas transport for oxygen production but in partial oxidation of methane to syngas at higher oxygen fluxes. For integration of the CGO support layer into a flat, asymmetric CGO membrane, the sintering activity of the CGO membrane was reduced by Fe2O3 addition (replacing Co3O4 as sintering additive). •Design of porous ceria supports for asymmetric oxygen transport membranes.•Investigation of support microstructure, mechanical properties and gas permeability.•Pore former percolation at constant porosity increases gas permeability significantly.•Dusty gas model predicts gas transport limitations through supports at high fluxes.•Use of sintering aids to co-sinter defect-free multilayers of support and membrane.
ISSN:0376-7388
1873-3123
DOI:10.1016/j.memsci.2016.04.016