Novel Cobalt-Free, Noble Metal-Free Oxygen-Permeable 40Pr0.6Sr0.4FeO3-未鈥?0Ce0.9Pr0.1O2鈭捨?/sub> Dual-Phase Membrane
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- 作者：Huixia Luo ; Heqing Jiang ; Tobias Klande ; Zhengwen Cao ; Fangyi Liang ; Haihui Wang ; J眉rgen Caro
- 刊名：Chemistry of Materials
- 出版年：2012
- 出版时间：June 12, 2012
- 年：2012
- 卷：24
- 期：11
- 页码：2148-2154
- 全文大小：432K
- 年卷期：v.24,no.11(June 12, 2012)
- ISSN：1520-5002
文摘
A novel cobalt-free and noble metal-free dual-phase oxygen-transporting membrane with a composition of 40 wt % Pr0.6Sr0.4FeO3鈭捨?/sub>鈥?0 wt % Ce0.9Pr0.1O2鈭捨?/sub> (40PSFO鈥?0CPO) has been successfully developed via an in situ one-pot one-step glycine-nitrate combustion process. In situ XRD demonstrated that the 40PSFO鈥?0CPO dual-phase membrane shows a good phase stability not only in air but also in 50 vol % CO2/50 vol % N2 atmosphere. When using pure He or pure CO2 as sweep gases, at 950 掳C steady oxygen permeation fluxes of 0.26 cm3 min鈥? cm鈥? and 0.18 cm3 min鈥? cm鈥? are obtained through the 40PSFO鈥?0CPO dual-phase membrane. The partial oxidation of methane (POM) to syngas was also successfully investigated in the 40PSFO鈥?0CPO dual-phase membrane reactor. Methane conversion was found to be higher than 99.0% with 97.0% CO selectivity and 4.4 cm3 min鈥? cm鈥? oxygen permeation flux in steady state at 950 掳C. Our dual-phase membrane - without any noble metals such as Ag, Pd or easily reducible metals oxides of Co or Ni - exhibits high oxygen permeation fluxes as well as good phase stability at high temperatures. Furthermore, the dual-phase membrane shows a good chemical stability under the harsh conditions of the POM reaction and in a CO2 atmosphere at high temperatures.