Enhancing the oxygen permeation rate of Zr(0.84)Y(0.16)O(1.92)-La(0.8)Sr(0.2)Cr(0.5)Fe(0.5)O(3-δ) dual-phase hollow fiber membrane by coating with Ce(0.8)Sm(0.2)O(1.9) nanoparticles.
Enhancing the oxygen permeation rate of Zr(0.84)Y(0.16)O(1.92)-La(0.8)Sr(0.2)Cr(0.5)Fe(0.5)O(3-δ) dual-phase hollow fiber membrane by coating with Ce(0.8)Sm(0.2)O(1.9) nanoparticles.
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DOI：
10.1021/am402125j
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发表时间：
2013-09
影响因子：
9.5
通讯作者：
Tongfa Liu;Yao Wang;Rong-hua Yuan;Jianfeng Gao;Chusheng Chen;Henny J. M. Bouwmeester
中科院分区：
文献类型：
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作者：
Tongfa Liu;Yao Wang;Rong-hua Yuan;Jianfeng Gao;Chusheng Chen;Henny J. M. Bouwmeester
采用相变与烧结相结合的方法制备了Zr0.84Y0.16O1.92-La0.8Sr0.2Cr0.5Fe0.5O3-δ (YSZ-LSCrF)双相复合中空纤维膜。用Ce0.8Sm0.2O1.9 （SDC）对中空纤维膜壳表面进行滴涂改性。由于未改性膜的透氧速率部分由表面交换动力学控制，因此在中空纤维膜的壳侧（氧还原侧）涂覆多孔SDC层可以提高其透氧性。在950°C的空气/氦气和空气/CO梯度下，速率提高了113和48%，最大氧通量分别为0.32和4.53 mL min(-1) cm（-2）。发现过量的SDC涂层会引起显著的气相传输限制，从而降低氧渗透速率。提出了一种计算包覆双相复合膜三相边界长度的模型，并解释了包覆对膜透氧性的影响。
Zr0.84Y0.16O1.92-La0.8Sr0.2Cr0.5Fe0.5O3-δ (YSZ-LSCrF) dual-phase composite hollow fiber membranes were prepared by a combined phase-inversion and sintering method. The shell surface of the hollow fiber membrane was modified with Ce0.8Sm0.2O1.9 (SDC) via a drop-coating method. As the rate of oxygen permeation of the unmodified membrane is partly controlled by the surface exchange kinetics, coating of a porous layer of SDC on the shell side (oxygen reduction side) of the hollow fiber membrane was found to improve its oxygen permeability. Rate enhancements up to 113 and 48% were observed, yielding a maximum oxygen flux of 0.32 and 4.53 mL min(-1) cm(-2) under air/helium and air/CO gradients at 950 °C, respectively. Excess coating of SDC was found to induce significant gas phase transport limitations and hence lower the rate of oxygen permeation. A model was proposed to calculate the length of triple phase boundaries (TPBs) for the coated dual-phase composite membrane and to explain the effect of coating on the oxygen permeability.