采用相转移纺织技术制备了致密的纯相钙钛矿BaCo0.4Fe0.4Zr0.2O3-δ(BCFZ)中空纤维透氧膜. 并用所制备的BCFZ中空纤维膜构建反应器对甲烷部分氧化制合成气进行研究. 结果表明: 在没有催化剂时, BCFZ膜材料本身对甲烷的活性较低, 甲烷转化率低于3%; 而加入Ni基催化剂后, 甲烷的转化率提高到93%以上、CO选择性为80%左右, 透氧量为11mL/min·cm2左右. 中空纤维膜反应器中初始阶段的活化只需要90min, 比片状膜反应器要快得多. 同时对在反应情况下, BCFZ中空纤维膜膜反应器的稳定性进行了初步的研究, 结果表明:BCFZ中空纤维膜在40h的操作中具有较好的稳定性.
The dense perovskite hollow fiber made of BaCo0.4Fe0.4Zr0.2O3-δ (BCFZ) was prepared by phase inversion spinning followed by sintering. The crystal structure and the microstructures of the hollow fiber membrane were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The sintered hollow fiber membrane was also used to construct a reactor for the partial oxidation of methane (POM) to syngas. It is found that the BCFZ itself exhibits low activity for conversion of methane which is lower than 3% without catalysts. After Ni-based catalyst is introduced, the conversion of methane, the CO selectivity and the oxygen permeation flux reach 93%, 80% and 11mL/min·cm2, respectively. It takes only 90min to get the steady state at initial stage in the hollow fiber membrane reactor, which is much shorter than that in the disk-type membrane reactor. The hollow fiber membrane reactor is steadily operated for 40h for the POM reaction.
参考文献
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