铝含量对60 Ce $_{0.9}$ Pr $_{0.1}$ O $_{2-δ}$-40 Pr $_{0.6}$ Sr $_{0.4}$ Fe $_{1-x}$ Al PDMATHAAG O $_{3-δ}$双相膜透氧性能的影响
Effects of Al content on the oxygen permeability through dual-phase membrane 60Ce$_{0.9}$Pr$_{0.1}$O$_{2-δ}$-40Pr$_{0.6}$Sr$_{0.4}$Fe$_{1-x}$Al$_x$O$_{3-δ}$
摘要：
组成为60 wt.%的陶瓷双相氧传输膜Ce0.9Pr0.1O2-δ-40wt.%以60Ce0.9Pr0.1O2-δ-40Pr0.6Sr0.4FeO3-δ掺杂Al为原料，采用改进的Pechini法成功合成了Pr0.6Sr0.4Fe1-xAlxO 3-δ（x = 0.05，0.1，0.2，0.3，0.4，0.6，0.8，1.0）（60 CPO-40 PSF 1-xAxO）。系统地研究了其晶体结构、表面微观形貌和透氧性能。钙钛矿相的晶胞参数随Al含量的增加先增大后减小，这与Al 3+的半径和杂质相的形成有关。当x在0.1 ~ 0.8范围内变化时，材料的透氧率先增大后减小，当x = 0.4时，0.4mm厚的60 CPO-40 PSF 1-xAxO膜在1000 °C下的透氧速率最大值为1.12 mL min-1 cm-2。XRD测试结果表明，该双相复合材料具有高温稳定性和耐CO2性能。用Al $^{3+}$部分取代Fe $^{3+}$ /Fe $^{4+}$使得材料不仅表现出良好的稳定性，而且还增加了膜的氧渗透性。
英文摘要：
Ceramic dual-phase oxygen transport membranes with the composition of 60wt.% Ce0.9Pr0.1O2-δ-40wt.%Pr0.6Sr0.4Fe1-xAlxO3-δ (x = 0.05, 0.1, 0.2, 0.3, 0.4, 0.6, 0.8, 1.0) (60CPO-40PSF1-xAxO) based on 60Ce0.9Pr0.1O2-δ-40Pr0.6Sr0.4FeO3-δ doped Al was successfully synthesized through a modified Pechini method. Crystal structure, surface microtopography and oxygen permeability are investigated systematically. The cell parameters of perovskite phase first increased and then decreased with the increase of Al content, which is related to the radius of the Al3+ and the formation of impurity phase. As x ranges from 0.1 to 0.8, the oxygen permeability of the materials first increases and then decreases, and the maximum value of oxygen permeation rate for 60CPO-40PSF1-xAxO membranes with 0.4mm thickness at 1000 °C is 1.12 mL min-1 cm-2 when x = 0.4. XRD measurements revealed high temperature stability and CO2-tolerant property of the dual-phase composites. The partial replacement of Fe$^{3+}$/Fe$^{4+}$ by Al$^{3+}$ causes the material not only to exhibit good stability, but also to increase the oxygen permeability of the membranes.
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