Fabrication of lanthanum-based perovskites membranes on porous alumina hollow fibre (AHF) substrates for oxygen enrichment. Issue 10 (July 2019)

• Record Type: Journal Article
• Authors: Sihar, Ainun Sailah; Othman, Nur Hidayati; Alias, Nur Hashimah; Shahruddin, Munawar Zaman; Asghrar Syed-Hassan, Syed Shatir; Rahman, Mukhlis A.; Ismail, Ahmad Fauzi; Wu, Zhentao
• Is Part Of: Ceramics international. Volume 45:Issue 10(2019)
• Page Start: 13086
• Page End: 13093
• Publication Date: 2019-07
• Subjects: Alumina hollow fibre -- MIEC perovskites -- Oxygen permeation -- LSCF -- Oxygen enrichment; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.03.242
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In this work, two types of lanthanum-based MIEC perovskite oxides, namely La0.6 Sr0.4 Co0.2 Fe0.8 O3-δ (LSCF) and La0.6 Sr0.4 Co0.2 Ni0.8 O3-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·cm 2 was observed at 950 °C. The present work demonstrated a feasible method for fabricating oxygen transport membrane (OTM) using porous AHF substrates