Palladium surface modified La0.6Sr0.4Co0.2Fe0.8O3−δ hollow fibres for oxygen separation

Abstract : Abstract View references (35) La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) hollow fibres were prepared by a phase inversion/sintering method using polyetherimide as a binder. In order to overcome surface exchange kinetics limitation, LSCF hollow fibres were coated with ∼200nm palladium (Pd) nanoparticles. The O2 flux of best performing membranes increased by up to 350% in comparison to unmodified LSCF hollow fibres. Optimal enhancement was achieved with a single Pd coating. Additional coatings resulted in reduced O2 fluxes, thus counter acting the beneficial spill-over effect of the catalyst. Long term stability testing in atmospheric air at 850°C showed that a LSCF membrane modified with a single Pd coating continually outperformed a pure LSCF hollow fibre for over 400h, though the level of enhancement was reduced over time. A dramatic reduction in performance of more than 45% occurred within the first 24h of testing, which was attributed to the coalescence and aggregation of Pd catalyst particles to ∼1000nm size at the LSCF grain boundaries. This greatly reduced the available area for the oxygen species to spill-over onto the LSCF surface and thus reduced the overall O2 flux. © 2011 Elsevier B.V.
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Submitted on : Friday, January 12, 2018 - 9:29:11 PM
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Christelle Yacou, Jaka Sunarso, Chun X.C. Lin, Simon Smart, Shaomin Liu, et al.. Palladium surface modified La0.6Sr0.4Co0.2Fe0.8O3−δ hollow fibres for oxygen separation. Journal of Membrane Science, Elsevier, 2011, 380 (1-2), pp.223 - 231. ⟨10.1016/j.memsci.2011.07.008⟩. ⟨hal-01683196⟩

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