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Production of pure oxygen from BSCF hollow fiber membranes using steam sweep

机译：使用蒸汽吹扫从BSCF中空纤维膜生产纯氧

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摘要

In this work, BSCF hollow fiber membranes made from a phase inversion/sintering technique produced high purity oxygen (>99.5%) at high flow rate of 9.52 mlmin~(-1) cm~(-2) at 950 °C using a steam sweep gas. Long term exposure to steam sweep gas revealed loss of performance. For instance, oxygen flux remained stable up to 20 h, though undergoing a significant reduction afterwards. Similarly, the oxygen purity reduced after 40 h testing, though less significantly as oxygen fluxes. We found that steam leached the elements of BSCF, mainly forming an extra layer of insoluble carbonates of barium and strontium. This was attributed to the reaction of the perovskite with carboxylic acid ever present in steam. In addition, steam exposure at high temperature reduced the area of diffraction and crystallite sizes of the reflective planes of the BSCF membrane, thus indicating that the steam exposure deteriorated the crystal ordering. The membrane area exposed to steam become porous while covered with a porous layer of carbonates of barium and strontium, thus limiting the oxygen surface kinetics and explaining the oxygen flux reduction over time.
机译：在这项工作中，由相转化/烧结技术制成的BSCF中空纤维膜在950°C下使用蒸汽以9.52 mlmin〜（-1）cm〜（-2）的高流速产生了高纯度氧气（> 99.5％）。扫气。长期暴露于蒸汽吹扫气体中会发现性能下降。例如，氧通量在20小时内仍保持稳定，尽管随后发生了显着降低。同样，经过40小时的测试后，氧气纯度降低了，尽管氧通量却没有那么明显。我们发现蒸汽浸出了BSCF的元素，主要形成了一层额外的钡和锶不溶碳酸盐。这归因于钙钛矿与蒸汽中曾经存在的羧酸的反应。另外，高温下的蒸汽暴露减少了BSCF膜的衍射面积和微晶尺寸，从而表明BSCF膜的蒸汽暴露使晶体的有序性恶化。暴露于蒸汽的膜区域变得多孔，同时被钡和锶的碳酸盐的多孔层覆盖，从而限制了氧气的表面动力学并解释了氧气流量随时间的减少。

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