Oxygen permeation properties of novel BaCo<inf>0.85</inf>Bi<inf>0.05</inf>Zr<inf>0.1</inf>O<inf>3-?</inf>hollow fibre membrane
MetadataShow full item record
© 2017 Elsevier Ltd In this work, we characterized and tested the oxygen permeation properties of BaCo 0.85 Bi 0.05 Zr 0.1 O 3-d (BCBZ) hollow fibre membranes fabricated by a combined phase inversion for spinning and sintering route using polyetherimide (PEI) as the polymer binder. The powder X-ray diffraction results showed that the BCBZ powder for spinning had to be calcined at around 950 °C to form a hexagonal phase structure, while the hollow fibre precursors were sintered at 1150–1200 °C to form the cubic perovskite structure for oxygen permeation. It displayed the highest oxygen flux of 7.3 cm 3 (STP) cm -2 min -1 at 950 °C under an air/He gradient. The theoretical correlation of the oxygen fluxes at different operating conditions showed that the oxygen permeation through BCBZ fibre was limited by surface exchange reactions. Carbon dioxide (CO 2 ) resistance of BCBZ hollow fibre was tested by exposing it to alternating different sweep gas containing helium (He), 20% CO 2 in He, 80% CO 2 in He, and pure He. Despite the significant reduction in oxygen fluxes upon subjected to CO 2 -containing sweep gases due to the strong CO 2 sorption on the membrane surface, no permanent damage on the membrane was detected and the original flux could be recovered at the end of the 105-h test once the sweep gas was switched back to helium. This result clearly highlights the high CO 2 resistance of BCBZ hollow fibre membrane due to the presence of Zr 4+ with higher acidity than Co 2+ in BCBZ perovskite lattice. High CO 2 tolerance enables the membrane use as membrane reactors for more advanced applications where the presence of CO 2 -containing atmosphere is unavoidable.
Showing items related by title, author, creator and subject.
Oxygen permeation behavior of La0.6Sr0.4Co0.8Fe0.2O3 hollow fibre membranes with highly concentrated CO2 exposureTan, X.; Liu, N.; Meng, B.; Sunarso, J.; Zhang, K; Liu, Shaomin (2012)La0.6Sr0.4Co0.8Fe0.2O3-a (LSCF) hollow fibre membranes with an asymmetric structure consisting of a central porous layer and two dense surface layers were prepared using a mixture of 50% ethanol + 50% NMP as the internal ...
Han, D.; Tan, X.; Yan, Z.; Liu, Shaomin (2012)Perovskite La0.6Sr0.4Co0.2Fe0.8O3-α (LSCF) hollow fibre membranes were fabricated by a combined phase inversion and sintering technique. The prepared membrane possessed a novel structure consisting of only one thin dense ...
Meng, B.; Wang, Z.; Liu, Y.; Tan, X.; da Costa, J.; Liu, Shaomin (2011)Ultrafine SrCo0.9Nb0.1O3− δ (SCNb) perovskite powders were synthesized by a modified Pechini method using EDTA and citrate acid as chelating agents. Dense SCNb hollow fibre membranes with an asymmetric structure were ...