Palladium surface modified La(0.6)Sr(0.4)Co(0.2)Fe(0.8)O(3-delta) hollow fibres for oxygen separation

Yacou, Christelle, Sunarso, Jaka, Lin, Chun X. C., Smart, Simon, Liu, Shaomin and Diniz da Costa, João C. (2011) Palladium surface modified La(0.6)Sr(0.4)Co(0.2)Fe(0.8)O(3-delta) hollow fibres for oxygen separation. Journal of Membrane Science, 380 1-2: 223-231. doi:10.1016/j.memsci.2011.07.008


Author Yacou, Christelle
Sunarso, Jaka
Lin, Chun X. C.
Smart, Simon
Liu, Shaomin
Diniz da Costa, João C.
Title Palladium surface modified La(0.6)Sr(0.4)Co(0.2)Fe(0.8)O(3-delta) hollow fibres for oxygen separation
Formatted title
Palladium surface modified La0.6Sr0.4Co0.2Fe0.8O3−δ hollow fibres for oxygen separation
Journal name Journal of Membrane Science   Check publisher's open access policy
ISSN 0376-7388
1873-3123
Publication date 2011-09
Sub-type Article (original research)
DOI 10.1016/j.memsci.2011.07.008
Volume 380
Issue 1-2
Start page 223
End page 231
Total pages 9
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2012
Language eng
Formatted abstract
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 ∼200 nm 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 400 h, though the level of enhancement was reduced over time. A dramatic reduction in performance of more than 45% occurred within the first 24 h of testing, which was attributed to the coalescence and aggregation of Pd catalyst particles to ∼1000 nm 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.

Highlights ► La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF) hollow fibres were coated with palladium (Pd) nanoparticles. ► The O2 flux of best performing membranes increased by up to 350% in comparison to unmodified LSCF hollow fibres. ► Optimal performance was achieved with a single Pd coating. ► LSCF Pd outperformed a pure LSCF hollow fibre for over 400 h testing, though O2 fluxes reduced over time. ► Pd particles aggregated at the LSCF grain boundaries within the first 24 h of testing, reducing O2 fluxes by > 45%.
Keyword Oxygen separation
Hollow fibres
Perovskites
Lscf
Pd surface modification
Perovskite membranes
Reducing agent
Air separation
Permeation
Enhancement
Fabrication
Silver
Module
Flux
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2012 Collection
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 27 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 28 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Sun, 25 Sep 2011, 00:08:03 EST by System User on behalf of School of Chemical Engineering