Synthesis, Oxygen Permeation, and CO2-Tolerance Properties of Ce0.8Gd0.2O2鈭捨?/sub>鈥揃a0.95La0.05Fe1鈥?i>xNbxO
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- 作者：Hongwei Cheng ; Naijun Zhang ; Xiaolu Xiong ; Xionggang Lu ; Hongbin Zhao ; Shenggang Li ; Zhongfu Zhou
- 刊名：ACS Sustainable Chemistry & Engineering
- 出版年：2015
- 出版时间：September 8, 2015
- 年：2015
- 卷：3
- 期：9
- 页码：1982-1992
- 全文大小：798K
- ISSN：2168-0485
文摘
A series of CO2-tolerant dual-phase dense oxygen permeable membranes of stoichiometry Ce0.8Gd0.2O2鈭捨?/sub>鈥揃a0.95La0.05Fe1鈥?i>xNbxO3鈭捨?/sub> (CG鈥揃LF1鈥?i>xNx, x = 0, 0.025, 0.05, 0.10, and 0.15) were designed and prepared by the sol鈥揼el method. Their stability regarding phase composition and structure, oxygen permeability, and CO2-tolerant property were investigated by X-ray diffraction (XRD), thermogravimetry and differential scanning calorimetry (TG-DSC), and temperature-programmed desorption of oxygen (O2-TPD). Results of the materials characterization showed excellent chemical compatibility between CG and BLF1鈥?i>xNx without the formation of any impurity phase after sintering at 1200 掳C in air. The oxygen-permeation experiments showed that with increasing niobium content, the oxygen permeability of the CG鈥揃LF1鈥?i>xNx membranes decreased slightly, but the compositional and structural stability in CO2 atmosphere improved significantly. The 60 wt % CG鈥?0 wt % BLF0.9N0.1 membrane showed simultaneously good oxygen permeability and excellent CO2 tolerance, and the oxygen-permeation flux reached 0.195 mL路cm鈥?路min鈥? in pure CO2 atmosphere at 925 掳C using a 1.0 mm thick membrane. This work demonstrates that CG鈥揃LF1鈥?i>xNx dual-phase membranes have great application potential for separating oxygen from highly concentrated CO2 atmosphere.