Ce0.8Sm0.2O1.9–La0.8Sr0.2Cr0.5Fe0.5O3−δ Dual-Phase Hollow Fiber Membranes Operated under Different Gradients
Ce0.8Sm0.2O1.9–La0.8Sr0.2Cr0.5Fe0.5O3−δ Dual-Phase Hollow Fiber Membranes Operated under Different Gradients
复制标题
DOI：
10.1021/ie500193c
复制
发表时间：
2014-03
影响因子：
4.2
通讯作者：
Tong Liu;Wei He;Huaqing Huang;Siwei Wang;H. Bouwmeester;Chusheng Chen
中科院分区：
文献类型：
--
作者：
Tong Liu;Wei He;Huaqing Huang;Siwei Wang;H. Bouwmeester;Chusheng Chen
采用相转化烧结法制备了Ce0.8Sm0.2O1.9−La0.8Sr0.2Cr0.5Fe0.5O3−δ（SDC-LSCrF）复合中空纤维膜。在950 °C下，通过将He或CO2（30 mL·min-1）进料到中空纤维（长度为48 mm）的内腔中，同时将壳侧暴露于环境空气中，测得平均氧通量为0.5 cm 3·cm-2·min-1（STP）。当使用反应性吹扫气体CO时，在给定条件下的氧通量增加到4.8 cm 3·cm−2·min−1（STP）。相对于使用He和CO2作为吹扫气时观察到的氧通量的活化能的显著降低表明，当使用后一种吹扫气时，发生由表面交换反应引起的速率限制。所开发的中空纤维膜在750 h的测试持续时间内显示出优异的稳定性，因此有望应用于富氧燃烧过程和膜反应器。
Ce0.8Sm0.2O1.9−La0.8Sr0.2Cr0.5Fe0.5O3−δ (SDC-LSCrF) composite hollow fiber membranes were prepared by phase inversion followed by sintering. Average oxygen fluxes of 0.5 cm3·cm−2·min−1 (STP) were measured, at 950 °C, by feeding either He or CO2 (30 mL·min−1) into the lumen of the hollow fiber (with length 48 mm), while exposing the shell side to ambient air. The oxygen flux at given conditions increases to 4.8 cm3·cm−2·min−1 (STP) when the reactive sweep gas CO is employed. The profound lowering of the activation energy for the oxygen flux relative to that observed upon using He and CO2 as sweep gas suggests that rate limitations by the surface exchange reaction occur when using the latter sweep gases. The developed hollow fiber membranes show excellent stability over the 750 h duration of the tests and therefore hold promise for application in oxyfuel combustion processes and membrane reactors.