Rapid glycine-nitrate combustion synthesis of the CO₂-stable dual phase membrane 40Mn_1.5Co_1.5O_4?¦Ä-60Ce_0.9Pr_0.1O_2?

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• 作者：Huixia Luo ; Heqing Jiang ; Tobias Kl ; e ; Fangyi Liang ; Zhengwen Cao ; Haihui Wang ; J¨¹rgen Caro
• 关键词：Dual phase membrane ; CO2-stable membrane ; Glycine-nitrate combustion synthesis ; Oxygen permeation
• 刊名：Journal of Membrane Science
• 出版年：2012
• 出版时间：15 December, 2012
• 年：2012
• 卷：423-424
• 期：Complete
• 页码：450-458
• 全文大小：1789 K

文摘

A rapid one-pot combustion synthesis method based on glycine-nitrate, has been applied to prepare a novel oxygen transporting dual phase CO₂-stable membrane of the composition 40 wt % Mn_1.5Co_1.5O_4?¦Ä-60 wt % Ce_0.9Pr_0.1O_2?¦Ä (40MCO-60CPO). After sintering at 1300 ¡ãC in air for 10 h, the 40MCO-60CPO membranes were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), back scattered SEM (BSEM), and energy dispersive X-ray spectroscopy (EDXS), showing that the 40MCO-60CPO composite represents a micro-scale mixture of mainly the two phases MCO and CPO, but small amounts of MnO₂ and (MnCo)(MnCo)₂O_4?¦Ä were detected in the sintered membranes as well. The oxygen permeation fluxes through the 40MCO-60CPO dual phase membrane were measured at elevated temperatures (900-1000 ¡ãC) with one side of the membrane exposed to synthetic air and the other side to a CO₂/He sweep gas stream. A stable oxygen permeation flux of 0.48 mL cm^?2 min^?1 was obtained for a 0.3 mm thick membrane under an air/CO₂ oxygen partial pressure gradient at 1000 ¡ãC. It was also found that 40MCO-60CPO dual phase membranes are stable for more than 60 h even when pure CO₂ was used as the sweep gas, which recommends 40MCO-60CPO membranes as promising candidates for 4-end membrane operation in an oxy-fuel power plant.