This investigation demonstrates the feasibility to fabricate high quality ceramic-carbonate membranes based on mixed-conducting ceramics. Specifically, it is reported the simultaneous CO₂/O₂ permeation and stability properties of membranes constituted by a combination of ceramic and carbonate phases, wherein the microstructure of the ceramic part is composed, in turn, of a mixture of fluorite and perovskite phases. These ceramics showed ionic and electronic conduction, and at the operation temperature, the carbonate phase of the membranes is in liquid state, which allows the transport of \(\rm{CO}_3^{2-}\) and O²⁻ species via different mechanisms. To fabricate the membranes, the ceramic powders were uniaxially pressed in a disk shape. Then, an incipient sintering treatment was carried out in such a way that a highly porous ceramic was obtained. Afterwards, the piece is densified by the infiltration of molten carbonate. Characterization of the membranes was accomplished by SEM, XRD, and gas permeation techniques among others. Thermal and chemical stability under an atmosphere rich in CO₂ was evaluated. CO₂/O₂ permeation and long-term stability measurements were conducted between 850 and 940 °C.The best permeation-separation performance of membranes of about 1 mm thickness, showed a maximum permeance flux of about 4.46×10⁻⁷ mol·m⁻²·s⁻²·Pa⁻¹ for CO₂ and 2.18×10⁻⁷ mol·m⁻²·s⁻¹·Pa⁻¹ for O₂ at 940 °C. Membranes exhibited separation factor values of 150–991 and 49–511 for CO₂/N₂ and O₂/N₂ respectively in the studied temperature range. Despite long-term stability test showed certain microstructural changes in the membranes, no significant detriment on the permeation properties was observed along 100 h of continuous operation.

中文翻译：

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混合导电陶瓷碳酸盐膜表现出高的CO 2 / O 2渗透通量和高温下的稳定性

这项研究证明了制造基于混合导电陶瓷的高质量碳酸陶瓷膜的可行性。具体地，据报道，由陶瓷和碳酸盐相的组合构成的膜同时具有CO ₂ / O ₂渗透和稳定性，其中陶瓷部件的微观结构又由萤石和钙钛矿相的混合物组成。这些陶瓷表现出离子导电性和电子导电性，并且在工作温度下，膜的碳酸盐相处于液态，这可以传输\（\ rm {CO} _3 ^ {2-} \）和O ²⁻物种通过不同的机制。为了制造膜，将陶瓷粉末单轴压成盘状。然后，以得到高度多孔的陶瓷的方式进行初期烧结处理。之后，通过熔融碳酸盐的渗透使该块致密化。膜的表征是通过SEM，XRD和气体渗透技术来完成的。评价了在富含CO ₂的气氛下的热和化学稳定性。在850至940°C的温度下进行了CO ₂ / O _2的渗透和长期稳定性测量。膜的最佳渗透分离性能为约1mm厚，最大渗透通量为约4.46×10 ^-7 mol·m。⁻²·S ^-2 ·帕^-1的CO ₂和2.18×10 ^-7摩尔·^米-2 ·^秒-1 ·帕^-1代表O ₂在940℃。在研究温度范围内，膜对CO ₂ / N ₂和O ₂ / N _2的分离系数分别为150-991和49-511 。尽管长期的稳定性测试表明膜的某些微结构变化，但在连续运行100小时后未观察到对渗透性能的明显损害。