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Processes 2019, 7(4), 199; https://doi.org/10.3390/pr7040199

Enhancing Oxygen Permeation via the Incorporation of Silver Inside Perovskite Oxide Membranes

1
School of Chemical Engineering, Shandong University of Technology, Zibo 255049, China
2
Department of Chemical Engineering, Curtin University, Perth, WA 6102, Australia
3
School of Chemical Engineering, The University of Queensland, Brisbane 4072, Australia
*
Author to whom correspondence should be addressed.
Received: 11 February 2019 / Revised: 31 March 2019 / Accepted: 3 April 2019 / Published: 8 April 2019
(This article belongs to the Special Issue Membrane Materials, Performance and Processes)
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Abstract

As a possible novel cost-effective method for oxygen production from air separation, ion-conducting ceramic membranes are becoming a hot research topic due to their potentials in clean energy and environmental processes. Oxygen separation via these ion-conducting membranes is completed via the bulk diffusion and surface reactions with a typical example of perovskite oxide membranes. To improve the membrane performance, silver (Ag) deposition on the membrane surface as the catalyst is a good strategy. However, the conventional silver coating method has the problem of particle aggregation, which severely lowers the catalytic efficiency. In this work, the perovskite oxide La0.8Ca0.2Fe0.94O3−a (LCF) and silver (5% by mole) composite (LCFA) as the membrane starting material was synthesized using one-pot method via the wet complexation where the metal and silver elements were sourced from their respective nitrate salts. LCFA hollow fiber membrane was prepared and comparatively investigated for air separation together with pure LCF hollow fiber membrane. Operated from 800 to 950 °C under sweep gas mode, the pure LCF membrane displayed the fluxes from 0.04 to 0.54 mL min−1 cm−2. Compared to pure LCF, under similar operating conditions, the flux of LCFA membrane was improved by 160%. View Full-Text
Keywords: mixed conducting; ceramic membranes; perovskite oxides; air separation mixed conducting; ceramic membranes; perovskite oxides; air separation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Ma, T.; Han, N.; Meng, B.; Yang, N.; Zhu, Z.; Liu, S. Enhancing Oxygen Permeation via the Incorporation of Silver Inside Perovskite Oxide Membranes. Processes 2019, 7, 199.

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