Abstract CO2 and O2 permeable ceramic-carbonate dual-phase membranes can be used in membrane reactors for applications such as selective oxidation of hydrocarbons. Two ceramic-carbonate dual-phase membranes consisting of mixed electronic-ionic conducting perovskite-type ceramics of Pr0.6Sr0.4Co0.2Fe0.8 and SrFe0.9Ta0.1O3-δ are studied for CO2 and O2 permeation and counter-permeation. The geometric factors for the carbonate phase and ceramic phase, obtained from the data of helium permeation and electrical conductivity, are used to calculate the effective carbonate and oxygen ionic conductivity in the carbonate and ceramic phase. Without counter-permeation, O2 permeation through the dual-phase membrane is controlled by oxygen ionic conduction in the ceramic phase and CO2 permeation is determined by the total conductance including effective carbonate and oxygen ionic conductivities in both phases. When the dual-phase membrane is exposed to CO2 on one side and O2 on the other side, counter-permeation of CO2 and O2 occurs in the opposite directions across the membrane. With CO2 counter-permeation, the oxygen ionic flux is higher than that without counter-permeation due to an increase in the driving force for oxygen transport. CO2 permeation consumes oxygen ions transporting through the membrane, resulting in a lower O2 permeation flux compared with the O2-only permeation case. However, O2 counter-permeation has negligible effect on CO2 permeation flux for the dual-phase membranes.

中文翻译：

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混合导电陶瓷-碳酸盐双相膜：气体渗透和反渗透

摘要 CO2 和 O2 可渗透陶瓷-碳酸盐双相膜可用于膜反应器，用于烃类的选择性氧化等应用。研究了由 Pr0.6Sr0.4Co0.2Fe0.8 和 SrFe0.9Ta0.1O3-δ 的混合电子离子导电钙钛矿型陶瓷组成的两种陶瓷-碳酸盐双相膜的 CO2 和 O2 渗透和反渗透。从氦渗透和电导率数据中获得的碳酸盐相和陶瓷相的几何因子用于计算碳酸盐和陶瓷相中的有效碳酸盐和氧离子电导率。没有反渗透，O2 通过双相膜的渗透由陶瓷相中的氧离子传导控制，而 CO2 渗透由总电导决定，包括两相中的有效碳酸盐和氧离子电导。当双相膜在一侧暴露于 CO2 而在另一侧暴露于 O2 时，CO2 和 O2 会以相反的方向穿过膜发生反渗透。有 CO2 反渗透时，氧离子通量高于没有反渗透的情况，因为氧传输的驱动力增加。CO2 渗透消耗通过膜传输的氧离子，导致与仅 O2 渗透情况相比较低的 O2 渗透通量。然而，O2 反渗透对双相膜的 CO2 渗透通量的影响可以忽略不计。