Enhanced High Oxygen Permeation of Mixed-Conducting Multichannel Hollow Fiber Membrane via Surface Modified Porous Layer

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• 作者：Shaobin Guo ; Jiawei Zhu ; Zhengkun Liu ; Xin Jiang ; Zhicheng Zhang ; Wanqin Jin
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2015
• 出版时间：July 15, 2015
• 年：2015
• 卷：54
• 期：27
• 页码：6985-6992
• 全文大小：440K
• ISSN：1520-5045

文摘

The oxygen permeation performance of Ba_0.5Sr_0.5Co_0.8Fe_0.2O_{3鈭捨?/sub> (BSCF) mixed-conducting multichannel hollow fiber (MCMHF) membranes was improved by surface modification via spin-spraying of a La0.6Sr0.4CoO3鈭捨?/sub> (LSC) porous layer. At 1173 K, the oxygen permeation flux of the modified membranes was clearly enhanced and reached 9.68 mL路cm^鈥?路min^鈥?, which is a remarkable high value in the field of mixed-conducting oxygen permeation membrane processes. Theoretical calculations demonstrated that the oxygen transport resistance, especially the surface exchange resistance, obviously decreased as a result of the modified LSC porous layer. Moreover, the process of oxygen permeation through the modified membrane was controlled by both bulk diffusion and the surface oxygen exchange reaction, whereas the oxygen permeation of the unmodified membrane was dominantly controlled by the surface oxygen exchange reaction. The modified MCMHF membranes showed generally stable oxygen permeation fluxes over 100 h at 1173 K.}