(SrCo_(0.8)Fe_(0.2)O_(3-δ))_(0.9)(SrZrO_3)_(0.1)中空纤维膜制备和氧分离性能研究  

Preparation and oxygen permeation property of (SrCo_(0.8)Fe_(0.2)O_(3-δ))_(0.9)(SrZrO_3)_(0.1) hollow fiber membrane

作　　者：李伟[1] 刘建军[1] 左艳波[1] 陈初升[1] 

机构地区：[1]中国科学技术大学材料科学与工程系先进功能材料与器件实验室,安徽合肥230026

出　　处：《中国科学技术大学学报》2008年第6期628-632,共5页JUSTC

基　　金：国家自然科学基金重点项目(50332040)资助

摘　　要：采用相转化法制备了SrCo0．8Fe0．2O3-δ-SrZrO3（10mol％）双相复合中空纤维陶瓷膜．所制得的纤维膜的壁厚为0．25mm，外径为1．70mm．为建立氧渗透所需的氧分压梯度，将膜的外壁暴露在空气中，内壁采用高纯氦气吹扫．在950℃时，采用30ml／min氦气吹扫，测得氧渗透速率为1．42ml·cm^-2·min^-1．氧渗透速率随温度而升高，在850-950℃范围内的表观活化能为35．3±1．6kJ／moL.随着吹扫气流量的增加，膜管内的氧分压下降，氧渗透速率提高．采用活塞式流动模型和Wagner氧渗透理论模拟了纤维膜的氧渗透过程，模拟结果与实测数据符合较好．Dual-phase hollow fiber membrane SrCo0.8Fe0.2O3-δ-SrZrO3（10 mol%） was prepared using the phase-inversion method. The hollow fiber had a dimension of 0.25 mm in thickness, 1.70 mm in outer diameter. The oxygen permeability of the hollow fiber was measured by exposing its shell side to ambient air and sweeping the tube side with high purity helium to carry away the permeated oxygen. An oxygen flux as large as 1.42 ml· cm^-2· min^-1 was obtained at 950 ℃. The permeation flux expectedly increased with temperature, and the apparent activation energy was calculated to be 35. 3 ± 1.6 kJ/mol in the temperature range of 850-950 ℃. The oxygen permeation flux also increased with the increase in the helium sweeping rate corresponding to a lower oxygen partial pressure at the tube side. A plug-flow model in combination with the Wagner theory was used to simulate the oxygen permeation process. The simulation results were in fair agreement with the measured permeation data.

关 键 词：混合导体 氧渗透 中空纤维膜 双相复合材料 

分 类 号：TQ174[化学工程—陶瓷工业] TB383[化学工程—硅酸盐工业]