The Zr_0.84Y_0.16O_1.92-La_0.8Sr_0.2Cr_0.5Fe_0.5O_3-δ (YSZ-LSCrF) dual-phase composite membrane is known to possess appreciable oxygen permeability and excellent stability under stringent operation conditions. In the present study, a sandwich-like symmetric YSZ-LSCrF membrane was prepared using the phase-inversion tape casting/lamination/sintering technique. The as-prepared membrane consisted of a 5 μm thick dense oxygen separation layer sandwiched between two 300 μm thick finger-like porous layers. To promote the surface oxygen exchange, the membrane was impregnated with Sm_0.2Ce_0.8O_2-δ (SDC) nanoparticles. The oxygen permeation flux through the membrane was measured by exposing one side of the membrane to a flowing air stream and the other side to a flowing CO stream. An oxygen permeation rate of 1.95 ml (STP) cm^–2 min^–1 was obtained at 900 °C. The oxygen permeation rate increased with increasing temperature as expected, and the apparent activation energy for oxygen permeation was calculated to be 29.5 kJ mol^–1. The membrane remained intact after the oxygen permeation measurement and thermal cycle stability test. The sandwich-like symmetric YSZ-LSCrF membrane with an ultra-thin oxygen separation layer demonstrated desired oxygen permeability and satisfactory durability, promising for membrane reactor applications. The preparation method developed in the present study can be applied to other ceramic membranes and devices requiring the similar sandwich-like symmetric structure.

已知Zr _0.84 Y _0.16 O _1.92 -La _0.8 Sr _0.2 Cr _0.5 Fe _0.5 O3 _-δ（YSZ-LSCrF）双相复合膜在苛刻的操作条件下具有明显的透氧性和优异的稳定性。在本研究中，使用相转化带流延/层压/烧结技术制备了三明治状的对称YSZ-LSCrF膜。所制备的膜由一个夹在两个300μm厚的手指状多孔层之间的5μm厚的致密氧分离层组成。为了促进表面氧交换，用Sm _0.2 Ce _0.8 O浸渍膜_2-δ（SDC）纳米粒子。通过使膜的一侧暴露于流动的空气流而另一侧暴露于流动的CO流来测量通过膜的氧气渗透通量。在900°C下获得的氧气渗透速率为1.95 ml（STP）cm ^–2  min ^–1。氧气的渗透速率随温度的升高而增加，如预期的那样，并且计算得出的氧气渗透的表观活化能为29.5 kJ mol ^–1。在氧气渗透测量和热循环稳定性测试之后，膜保持完整。具有超薄氧气分离层的夹心状对称YSZ-LSCrF膜表现出所需的透氧性和令人满意的耐久性，有望用于膜反应器。本研究开发的制备方法可应用于其他需要类似夹心对称结构的陶瓷膜和装置。