TY - JOUR
T1 - Fabrication of lanthanum-based perovskites membranes on porous alumina hollow fibre (AHF) substrates for oxygen enrichment
AU - Sihar, Ainun Sailah
AU - Othman, Nur Hidayati
AU - Alias, Nur Hashimah
AU - Shahruddin, Munawar Zaman
AU - Asghrar Syed-hassan, Syed Shatir
AU - Rahman, Mukhlis A.
AU - Ismail, Ahmad Fauzi
AU - Wu, Zhentao
N1 - © 2019, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
PY - 2019/7/1
Y1 - 2019/7/1
N2 - In this work, two types of lanthanum-based MIEC perovskite oxides, namely La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) and La0.6Sr0.4Co0.2Ni0.8O3-δ (LSCNi), were deposited onto porous alumina hollow fibre (AHF) substrates and used for oxygen enrichment. Such structure was developed to shorten oxygen ion diffusion distances in dense membranes and simultaneously leading to higher oxygen flux. The perovskite oxides were prepared using Pechini sol-gel method and deposited via a vacuum-assisted technique. The deposition of lanthanum-based membranes onto the outer and inner sides of the porous AHF has been facilitated through numerous microchannels in the AHF substrates. The effects of operating temperature and argon sweep gas flowrate on oxygen permeation flux of lanthanum-based AHF membrane were investigated. The results revealed that the oxygen permeation flux of LSCF-AHF and LSCNi-AHF increased with operating temperatures due to the improvement of bulk diffusion and surface exchange properties after the lanthanum-based perovskite deposition. Higher oxygen flux was observed for LSCNi-AHF as LSCNi possessed balanced oxygen ionic and electronic conductivities as compared to LSCF membranes. Benefitting from improved oxygen activation and vacancy generation properties after Ni substitution into the B-site ion of LSC perovskite, a dramatic increased oxygen fluxes up to 4.5 mL/min·cm2 was observed at 950 °C. The present work demonstrated a feasible method for fabricating oxygen transport membrane (OTM) using porous AHF substrates.
AB - In this work, two types of lanthanum-based MIEC perovskite oxides, namely La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) and La0.6Sr0.4Co0.2Ni0.8O3-δ (LSCNi), were deposited onto porous alumina hollow fibre (AHF) substrates and used for oxygen enrichment. Such structure was developed to shorten oxygen ion diffusion distances in dense membranes and simultaneously leading to higher oxygen flux. The perovskite oxides were prepared using Pechini sol-gel method and deposited via a vacuum-assisted technique. The deposition of lanthanum-based membranes onto the outer and inner sides of the porous AHF has been facilitated through numerous microchannels in the AHF substrates. The effects of operating temperature and argon sweep gas flowrate on oxygen permeation flux of lanthanum-based AHF membrane were investigated. The results revealed that the oxygen permeation flux of LSCF-AHF and LSCNi-AHF increased with operating temperatures due to the improvement of bulk diffusion and surface exchange properties after the lanthanum-based perovskite deposition. Higher oxygen flux was observed for LSCNi-AHF as LSCNi possessed balanced oxygen ionic and electronic conductivities as compared to LSCF membranes. Benefitting from improved oxygen activation and vacancy generation properties after Ni substitution into the B-site ion of LSC perovskite, a dramatic increased oxygen fluxes up to 4.5 mL/min·cm2 was observed at 950 °C. The present work demonstrated a feasible method for fabricating oxygen transport membrane (OTM) using porous AHF substrates.
KW - Alumina hollow fibre
KW - LSCF
KW - MIEC perovskites
KW - Oxygen enrichment
KW - Oxygen permeation
UR - https://linkinghub.elsevier.com/retrieve/pii/S0272884219307977
UR - http://www.scopus.com/inward/record.url?scp=85063739532&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2019.03.242
DO - 10.1016/j.ceramint.2019.03.242
M3 - Article
SN - 0272-8842
VL - 45
SP - 13086
EP - 13093
JO - Ceramics International
JF - Ceramics International
IS - 10
ER -