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混合导体透氧材料由于在高温下具有氧离子导电特性,在纯氧制备、膜反应器及富氧燃烧等方面显示出广阔的应用前景。单相混合导体材料用作透氧材料时存在稳定性不足、机械性能差等问题,限制了其在生产中的实际应用。在离子导体相中掺入电子导体相形成双相导体膜可以提高透氧材料在高温下和高氧浓度梯度下的工作稳定性和化学稳定性。本文详细论述了双相透氧材料的透氧机理和研究进展,包括氧离子导体/贵金属电子导体和氧离子导体/氧化物电子导体和氧离子导体/混合导体等的复合形式。重点分析了材料的组成、结构以及两相之间的化学相容性和混合比例对材料透氧率和工作稳定性的影响。介绍了双相材料在甲烷部分氧化制合成气(POM)膜反应过程及富氧燃烧中的应用,分析了目前有待解决的问题并提出了今后的研究方向。
Due to its oxygen ion conductivity at high temperature, mixed conductor oxygen permeable materials have shown broad application prospects in the field of pure oxygen preparation, membrane reactor and oxygen-rich combustion. Single-phase mixed conductor materials used as oxygen-permeable materials, there is insufficient stability, poor mechanical properties and other issues, limiting its practical application in the production. Incorporating an electron conductor phase into the ionic conductor phase to form a biphasic conductor film can improve the working stability and chemical stability of the oxygen permeable material under high temperature and high oxygen concentration gradient. In this paper, the oxygen permeation mechanism and research progress of two-phase oxygen-permeable materials are discussed in detail, including oxygen ion conductor / noble metal electron conductor and oxygen ion conductor / oxide electron conductor and oxygen ion conductor / mixed conductor. The effects of material composition, structure, chemical compatibility and mixing ratio on the oxygen permeability and work stability of the material were analyzed. The applications of biphasic materials in the reaction of partial oxidation of methane to synthesis gas (POM) membrane and oxy-fuel combustion are introduced. The problems to be solved and the future research directions are pointed out.