title: Novel Approach for Developing Dual-Phase Ceramic Membranes for Oxygen Separation through Beneficial Phase Reaction.
abstract: A novel method based on beneficial phase reaction for developing composite membranes with high oxygen permeation flux and favorable stability was proposed in this work. Various Ce0.8Sm0.2O2-δ (SDC) + SrCO3+Co3O4 powders with different SDC contents were successfully fabricated into membranes through high temperature phase reaction. The X-ray diffraction (XRD) measurements suggest that the solid-state reaction between the SDC, SrCO3 and Co3O4 oxides occurred at the temperature for membrane sintering, leading to the formation of a highly conductive tetragonal perovskite phase SmxSr1-xCoO3-δ. The morphology and elemental distribution of the dual-phase membranes were characterized using back scattered scanning electron microscopy and energy dispersive X-ray spectroscopy (BSEM-EDX). The oxygen bulk diffusivity and surface exchange properties of the materials were investigated via the electrical conductivity relaxation technique, which supported the formation of conductive phases. The SDC+20 wt % SrCO3+10.89 wt % Co3O4 membrane exhibited the highest permeation flux among the others, reaching 0.93 mL cm(-2) min(-1) [STP = standard temperature and pressure] under an air/helium gradient at 900 °C for a membrane with a thickness of 0.5 mm. In addition, the oxygen permeation flux remained stable during the long-time test. The results demonstrate the beneficial phase reaction as a practical method for the development of high-performance dual-phase ceramic membranes.
authors.affiliation: State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry & Chemical Engineering, Nanjing Tech University , Nanjing 210009, P. R. China.
authors.forename: Zhenbao
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry & Chemical Engineering, Nanjing Tech University , Nanjing 210009, P. R. China.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry & Chemical Engineering, Nanjing Tech University , Nanjing 210009, P. R. China.
authors.forename: Yubo
authors.initials: Y
authors.lastname: Chen
authors.affiliation: Department of Chemistry, Jinan University , Guangzhou 510632, P.R. China.
authors.forename: Dengjie
authors.initials: D
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry & Chemical Engineering, Nanjing Tech University , Nanjing 210009, P. R. China.
authors.forename: Jiawei
authors.initials: J
authors.lastname: Chen
authors.affiliation: Department of Chemical Engineering, Curtin University , Perth, Western Australia 6845, Australia.
authors.forename: Shaomin
authors.initials: S
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry & Chemical Engineering, Nanjing Tech University , Nanjing 210009, P. R. China.
authors.forename: Wanqin
authors.initials: W
authors.lastname: Jin
authors.affiliation: State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry & Chemical Engineering, Nanjing Tech University , Nanjing 210009, P. R. China.|Department of Chemical Engineering, Curtin University , Perth, Western Australia 6845, Australia.
authors.forename: Zongping
authors.initials: Z
authors.lastname: Shao
keywords: dual-phase membrane; oxygen permeation; permeation flux; phase reaction; stability