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

Processes

Ning Han¹  Shaomin Liu¹  Teng Ma²  Naitao Yang²  Bo Meng²  Zhonghua Zhu³ 

[1] Department of Chemical Engineering, Curtin University, Perth, WA 6102, Australia;School of Chemical Engineering, Shandong University of Technology, Zibo 255049, China;School of Chemical Engineering, The University of Queensland, Brisbane 4072, Australia;

关键词: mixed conducting;    ceramic membranes;    perovskite oxides;    air separation;   

DOI  :  10.3390/pr7040199

来源: DOAJ

【 摘 要 】

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 La_0.8Ca_0.2Fe_0.94O_3−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%.

【 授权许可】

Unknown