非对称LSCF中空纤维透氧膜的制备及性能  

Preparation and Performance of Asymmetry LSCF Hollow Fiber Oxygen-permeable Membrane

作　　者：邹成贤 介志远 王洋 王晓斌 孟波 杨乃涛 ZOU Chengxian;JIE Zhiyuan;JVANG Yang;WANG Xiaobin;MENG Bo;YANG Naitao(School of Chemistry and Chemical Engineering,Shandong University of Technology,Zibo 255000,Shandong,China)

机构地区：[1]山东理工大学化学化工学院,山东淄博255000

出　　处：《硅酸盐学报》2021年第4期785-792,共8页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(21776166);山东省自然科学基金(ZR2016JL011);山东省重点研发计划(2017GGX70105);山东省高等学校青创科技支持计划(2019KJC030)。

摘　　要：采用溶胶-凝胶法制备了具有钙钛矿型结构的La_(0.6)Sr_(0.4)Co_(1-y)FeyO_(3-δ)(LSCF,y=0.2,0.5或0.8)氧化物,然后以相转化烧结技术制备了LSCF中空纤维透氧膜,考察了凝固浴与Co/Fe摩尔比对LSCF中空纤维膜微结构及透氧性能的影响.使用70%(质量分数)NMP与30%乙醇的混合液作为内凝固浴,去离子水为外凝固浴,制备了具有外表面薄而致密的分离层、同时具有贯穿内表面的众多指状孔结构的LSCF中空纤维陶瓷膜.指状孔结构会极大地降低扩散阻力,从而改善LSCF膜的透氧量.LSCF中空纤维膜的透氧量随温度和吹扫气He吹扫速率的增加逐渐升高.Co/Fe摩尔比对LSCF中空纤维膜的微观结构和透氧量具有重要影响,透氧量随Co/Fe摩尔比的增大而增加.950℃(透氧膜的测试温度)、吹扫气He的吹扫速率为120 mL·min^(-1)、Co/Fe摩尔比为4时,LSCF透氧膜的氧气渗透通量达到2.81 mL·min^(-1)·cm^(-2).A series of La_(0.6)Sr_(0.4)Co_(1-y)FeyO_(3-δ)(LSCF,y=0.2,0.5 or 0.8)oxides with perovskite structure was prepared by sol-gel method,and then the corresponding hollow fiber membranes with different microstructures were fabricated through the phase inversion/sintering method.The influence of the coagulant and Co/Fe molar ratio on the microstructure and oxygen permeability of LSCF hollow fiber membranes was investigated.LSCF hollow fiber membrane with a dense thin outer surface and large numbers of finger-like channels was prepared by using a mixture of 70%(mass fraction)NMP and 30%ethanol as internal coagulation and deionized water as outer coagulation.The finger-like pores could greatly reduce the diffusion resistance,and thus improving the oxygen permeability.With the increase of temperature and the rate of helium sweeping gas,the oxygen permeation flux of LSCF hollow fiber membrane increases gradually.The Co/Fe molar ratio has an important influence on the membrane microstructure and oxygen permeation.The O_(2) permeation flux increased with increasing the Co/Fe molar ratio.The oxygen permeation flux reached up to 2.81 mL·min^(-1)·cm^(-2) at a helium sweeping rate of 120 mL·min^(-1) and Co/Fe molar ratio of 4 at 950℃(the test temperature of oxygen-permeable membrane).

关 键 词：中空纤维 钙钛矿型氧化物 透氧膜 透氧量 

分 类 号：TQ174[化学工程—陶瓷工业]