Novel Cobalt-Free, Noble Metal-Free Oxygen-Permeable 40Pr0.6Sr0.4FeO3-delta-60Ce
0.9Pr0.1O2-delta, Dual-Phase Membrane

Luo, Huixia; Jiang, Heqing; Klande, Tobias; Zhengwen, Cao; Liang, Fangyi; Wang, Haihui; Caro, Jürgen

doi:10.1021/cm300710p

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Novel Cobalt-Free, Noble Metal-Free Oxygen-Permeable 40Pr_0.6Sr_0.4FeO₃-delta-60Ce_0.9Pr_0.1O₂-delta, Dual-Phase Membrane

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Jiang, Heqing
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Luo, H., Jiang, H., Klande, T., Zhengwen, C., Liang, F., Wang, H., et al. (2012). Novel Cobalt-Free, Noble Metal-Free Oxygen-Permeable 40Pr_0.6Sr_0.4FeO₃-delta-60Ce_0.9Pr_0.1O₂-delta, Dual-Phase Membrane. CHEMISTRY OF MATERIALS, 24(11), 2148-2154. doi:10.1021/cm300710p.

Cite as: https://hdl.handle.net/11858/00-001M-0000-000E-F358-D

Abstract

A novel cobalt-free and noble metal-free dual-phase oxygen-transporting membrane with a composition of 40 wt % Pr_0.6Sr_0.4FeO₃-delta-60 wt % Ce_0.9Pr_0.1O₂-delta (40PSFO-60CPO) has been successfully developed via an in situ one-pot one-step glycine-nitrate combustion process. In situ XRD demonstrated that the 40PSFO-60CPO dual-phase membrane shows a good phase stability not only in air but also in SO vol % CO₂/50 vol % N₂ atmosphere. When using pure He or pure CO₂ as sweep gases, at 950 degrees C steady oxygen permeation fluxes of 0.26 cm³ min^-1 cm^-2 and 0.18 cm³ min^-1 cm^-2 are obtained through the 40PSFO-60CPO dual-phase membrane. The partial oxidation of methane (POM) to syngas was also successfully investigated in the 40PSFO-60CPO dual-phase membrane reactor. Methane conversion was found to be higher than 99.0% with 97.0% CO selectivity and 4.4 cm³ min^-1 cm^-2 oxygen permeation flux in steady state at 950 degrees 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. Accession Number: WOS:000305092600022