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Synthesis and oxygen permeability of SDC-BCCF dual-phase oxygen permeable membrane materials

Authors： XIA Xin，MIAO Qiang，YANG Wei, LI Fang, LI Qiming*

Units： School of Chemistry, Chemical Engineering and Environmental Engineering，Liaoning Shihua University

KeyWords： Dual-phase oxygen permeable membrane; perovskite, oxygen flux; bulk diffusion; surface exchange

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2018,38(4):75-80

Abstract：

In order to improve the stability and oxygen flux of oxygen permeable membrane materials, Ce0.8Sm0.2O1.9(50wt.%)-BaCe0.1Co0.3Fe0.6O3-σ(50wt.%)(SDC-BCCF) fluorite-perovskite dual-phase oxygen permeable membrane materials were synthesized by one-spot method, and the effect of operation temperature, membrane thickness and oxygen partial pressure gradient (sweeping gas rate) on oxygen flux of SDC-BCCF dual phase membranes were investigated. XRD patterns of SDC-BCCF show that fluorite SDC and perovskite BCCF phases could be homogeneously mixed in SDC-BCCF dual-phase materials. However, the refined XRD patterns reveal that trace mounts of perovskite BeCeO3 impure phase can still be identified. SEM images show that the dense SDC-BCCF dual-phase membrane disk can be obtained at 1450oC. Oxygen permeation tests demonstrated that oxygen flux of SDC-BCCF dual phase membranes can be improved by raising the temperature, reducing the membrane thickness and increasing the sweeping gas rate. It was found that the oxygen permeation flux can reach 0.71 ml.min-1.cm-2 at 950oC for SDC-BCCF membrane with a thickness of 0.5mm. The rate-determining step of SDC-BCCF dual-phase membranes was also checked in our experiment, which showed that the oxygen permeation for SDC-BCCF dual-phase membrane was determined by bulk diffusion when the membrane thickness is more than or equal to 0.7 mm. However, while the membrane thickness was decreased to less than 0.7 mm, the oxygen permeation of SDC-BCCF membranes transforms into the surface-exchange control.

Funds：

国家自然科学基金项目（21703091, 21201096）；辽宁省教育厅资助项目 (L2010242)；辽宁省教育厅辽宁石油化工大学石油化工重点实验室项目(LZ2015050)；中国科学院煤制乙二醇及相关技术重点实验室资助项目。

AuthorIntro：

作者简介：苗强（1993年5月），男，本科，辽宁盘锦人，硕士在读，主要从事新型透氧膜材料及膜催化的研究工作，E-mail：xiaxin_001@163.com. 通讯联系人：李其明（1977-），男，副教授，博士学位；E-mail：lqm_dicp@163.com；研究方向：储氢能源与催化新材料。

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