摘要
报道SrFe1.125Co0.375Oy致密陶瓷膜在高氧梯度下的氧渗透行为。将膜的一端置于空气中，另一端引入CO，通过CO的氧化反应降低氧分压，增大膜两端的氧分压梯度。研究发现：900℃时氧渗透率高达16.0×10-7mol/cm2s。在850℃以上，氧渗透率与温度的依赖关系不显著，而氧渗透量与CO分压成线形关系，并且与膜的厚度变化基本无关。这表明在该膜材料的氧渗透过程是受表面反应控制的。
Oxygen permeation through dense SrFe1.125Co0.375Oy membranes was studied by exposing one side of the membranes to flowing air and the other side to the mixture of CO and helium. The oxygen permeation flux reached as large as 6.0×10-7mol/cm2s at 900℃. The oxygen permeation showed a weak temperature dependence at temperatures about 850℃. The oxygen flux increased linearly with increasing CO partial pressure and remained almost constant with variation of the membrane thickness. These observations all indicate that the overall oxygen permeation process is limited by the surface reaction at the membrane surface exposed to CO.
基金
国家863新材料委员会基金!(715-006-0120)
国家自然科学基金!(59789201)
