High-Flux Oxygen-Transporting Membrane Pr0.6Sr0.4Co0.5Fe0.5O3-δ: CO2 Stability and Microstructure
High-Flux Oxygen-Transporting Membrane Pr0.6Sr0.4Co0.5Fe0.5O3-δ: CO2 Stability and Microstructure
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DOI：
10.1021/am501657j
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发表时间：
2014-07-09
影响因子：
9.5
通讯作者：
Caro, Juergen
中科院分区：
文献类型：
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作者：
Partovi, Kaveh;Liang, Fangyi;Caro, Juergen
氧气输送膜（OTM）的高氧气渗透性和良好的热化学稳定性是关于这些装置在化学过程（例如CO、使用氧燃料概念的捕获或催化膜反应器）中的适用性的两个主要要求。在这项工作中，单相钙钛矿型膜Pr0.6Sr0.4Co0.5Fe0.5O3-delta（PSCF）与0.6毫米厚的进行周期性的热循环在850和1000摄氏度之间的温度范围内，在1000小时的长期渗透测试与纯CO2作为吹扫气。该长期渗透操作的结果显示，在每次热循环之后，在1000 ℃下的氧渗透值逐步增加，从第一循环的1.38 cm（3）（STP）min（-1）cm（-2）达到第四循环的1.75 cm（3）（STP）min（-1）cm（-2）。此外，该膜在900摄氏度及以上显示出非常好的CO2稳定性。尽管在850 ℃下氧渗透通量部分降低，但达到0.25 cm（3）（STP）min（-1）cm（-2）的稳定状态并保持超过100 h。新开发的PSCF膜也表现出更高的氧气渗透通量与He和CO2吹扫在所有测量的温度相比，类似的La0.6Sr0.4Co0.8Fe0.2O3-δ（LSCF）膜。
High oxygen permeability and good thermochemical stability of oxygen-transporting membranes (OTMs) are two main requirements concerning the applicability of these devices in chemical processes, such as CO, capture using the oxyfuel concept or catalytic membrane reactors. In this work, a single-phase perovskite-type membrane Pr0.6Sr0.4Co0.5Fe0.5O3-delta (PSCF) with 0.6-mm thickness was subjected to periodic thermal cycling in the temperature range between 850 and 1000 degrees C in a 1000-h long-term permeation test with pure CO2 as the sweep gas. The results of this long-term permeation operation revealed a stepwise increase in oxygen permeation values at 1000 degrees C after each thermal cycle, reaching from 1.38 cm(3) (STP) min(-1) cm(-2) in the first cycle to 1.75 cm(3) (STP) min(-1) cm(-2) in the fourth cycle. Furthermore, the membrane showed very good CO2 stability at 900 degrees C and above. Despite a partial decrease in oxygen permeation fluxes at 850 degrees C, a steady state of 0.25 cm(3) (STP) min(-1) cm(-2) was reached and maintained for more than 100 h. The newly developed PSCF membrane also exhibited a higher oxygen permeation flux with He and CO2 sweeping at all measured temperatures compared to a similar La0.6Sr0.4Co0.8Fe0.2O3-delta (LSCF) membrane.