高等学校化学学报Issue(7)：1246-1253,8.DOI:10.7503/cjcu20141082
CO2气氛中La掺杂BaCo0.88 Nb0.12 O3-δ膜的透氧性能及结构稳定性
Oxygen Permeation Property and Structural Stabiltiy of La-doped BaCo0. 88 Nb0. 12 O3-δMembranes in CO2 Atmosphere†
摘要
Abstract
La-doped BaCo0. 88 Nb0. 12 O3-δ( BLCN-x, x represents the molar ratio of La) perovskite membranes were prepared by solid phase reaction. The structrural stability of membranes was analyzed by X-ray diffraction ( XRD) , scanning electron microscopy( SEM) , thermogravimetric( TG) analysis and temperature programmed desorption-mass spectrography( TPD-MS) methods. The results indicated that the CO2 tolerance properties of BLCN-x membranes were improved markedly with the increase of La content. Specially, the diffraction peaks of witherite can't be observed for the membranes with a La content higher than 0. 5, whatever the membranes were calcined or conducted the oxygen permeation measurement with pure CO2 sweeping. The initial oxygen permeation flux of BLCN-x membranes would be reduced with the doping of La, however, the oxygen flux of BLCN-x membranes swept by CO2 was more stable with the increase of La content. Particularly, the oxygen flux of BLCN-0. 5 membrane is about 0. 46 mL·cm-2 ·min-1 after pure CO2 sweeping for 10 h. The better structural stability and CO2 tolerance properties of BLCN-x membranes with higher La content are due to more appropriate Goldschmidt tolerance factor and the enhanced average metal-oxygen bond energy.关键词
钙钛矿/透氧膜/二氧化碳/掺杂/结构稳定性Key words
Perovskite/Oxygen permeation membrane/CO2/Doping/Structural stability分类
化学化工引用本文复制引用
张星星,吴成章,周建芳,杨恭辉,刘银河,张玉文,丁伟中..CO2气氛中La掺杂BaCo0.88 Nb0.12 O3-δ膜的透氧性能及结构稳定性[J].高等学校化学学报,2015,(7):1246-1253,8.基金项目
国家自然科学基金(批准号:51274139,51174133)、上海市教委创新项目(批准号:13YZ019)及教育部博士学科点专项科研基金(批准号:20123108120020)资助.@@@@? Supported by the National Natural Science Foundation of China(Nos.51274139,51174133), the Innovation Program of Shanghai Municipal Education Commission, China(No.13YZ019) and the Doctoral Fund of Ministry of Education of China(No.20123108120020) （批准号:51274139,51174133）
