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Surface optimization of SDC-SSF dual-phase oxygen permeable membranes and its oxygen permeability

Authors： XIE Pinhong，LI Fang, PEI Yujie, GUO Yuanyu, WANG Yusheng, LI Qiming

Units： School of petrochemical Engineering，Liaoning Petrochemical University，Fushun 113001，China

KeyWords： dual-phase oxygen permeable membrane; chemical etching; porous layer; catalyst; oxygen flux

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2022,42(3):84-90

Abstract：

SDC-SSF (75wt% Ce0.85Sm0.15O2-? -25wt% Sm0.6Sr0.4FeO3-?) dual phase oxygen permeable membranes were firstly synthesized by a sol-gel method. Then the ultra-microporous porous structure can be constructed on the surface of SDC-SSF oxygen permeable membranes by chemical etching method. The construction of the robust surface activation catalysts can be realized by means of porous layer. The experimental results show that SSF perovskite phase can be effectively leached out from the dual phase membrane by chemical etching, and thus the ultra-porous structure can be spontaneously formed based on the residual SDC fluorite particles. The cobalt-based perovskite catalysts with a lower melting point, Ba0.4 Sr0.4Ca0.2Co0.8Fe0.2O3-? (BSCCF), were coated onto SDC porous layer. After the second high temperature sintering, BSCCF perovskite catalysts can be melted and penetrate into SDC porous layer. Hence, a robust catalyst layer can be constructed on the surface of SDC-SSF dual phase membranes. In this paper, the oxygen permeation flux, the activation energy and rate-determining steps of the original membrane, the porous membrane and the membrane modified with the catalysts were compared systematically. It can be found that the oxygen permeation flux increases successively after chemical-etching and the catalyst loading. The maximum oxygen flux of the optimized 1.0 mm-thick SDC-SSF membrane reaches about 0.36 ml. cm-2. min-1 at 950oC. Through the analysis of Wagner equation, it can be found that the rate-determining step of SDC-SSF dual-phase membranes changes gradually from the surface exchanging control to the bulk diffusion control after chemical-etching and catalyst modifying. This study provides an effective method to construct a robust catalysis layer on the surface of dual-phase oxygen permeable membranes.

Funds：

国家自然科学基金项目（21703091, 21201096）；辽宁省教育厅资助项目 (L2019009)；辽宁科技厅计划指导项目（2019-ZD-0058）。

AuthorIntro：

解品红（1996年-），女，在读硕士， 1771593694@qq.com；研究方向：膜分离材料研究。

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