 |
HAL Université des Antilles |  |
Journal articles
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.
https://hal.univ-antilles.fr/hal-01683196
Contributor : Christelle Yacou <>
Submitted on : Friday, January 12, 2018 - 9:29:11 PM
Last modification on : Tuesday, May 28, 2019 - 2:18:04 PM
Contributor : Christelle Yacou <>
Submitted on : Friday, January 12, 2018 - 9:29:11 PM
Last modification on : Tuesday, May 28, 2019 - 2:18:04 PM