膜科学与技术

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ClassificationCode：TQ028.8

year,volume(issue):pagination： 2020,40(2):45-52

Abstract：

A potassium-doped K0.1Sr0.9Co0.8Fe0.2O3-?(KSCF) perovskite material was successfully prepared by a sol-gel method. Oxygen permeability, structural stability and rate-determined step were investigated systematically. XRD characterization shows that while the potassium doping content is lower than or equal to 10%, KSCF cubic perovskite phase can be obtained. SEM results show that the highly dense KSCF membrane disk can be attained at 1220oC. Moreover, KSCF membrane disk possesses excellent mechanical strength under the long-term air condition, which cannot be disintegrated spontaneously as SrCo0.8Fe0.2O3-? material (SCF). Oxygen permeation test shows that the increase of operation temperature, the decrease of membrane thickness and the increase of purge gas flow rate are beneficial to improve oxygen permeation flux of KSCF membranes. Especially, it can be found that oxygen flux of KSCF membrane with a thickness of 0.5mm can reach about 2.65ml·cm-2·min-1 at 950oC. Further comparison experiment indicates that oxygen permeability of KSCF membrane is also higher than SCF under the same measurement conditions. Through investigating the rate-determining steps of KSCF membranes, it can be found that while the KSCF membrane thickness is lower than 0.7mm, oxygen permeation of KSCF membranes is determined by surface exchange process. While KSCF membrane thickness is higher than 0.7mm, their oxygen permeation is determined by bulk diffusion process.

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国家自然科学基金项目（21703091, 21201096）；辽宁省教育厅资助项目 (L2019009)；辽宁省教育厅辽宁石油化工大学石油化工重点实验室项目(LZ2015050)

AuthorIntro：

第一作者简介：刘力魁（1993年-），男，本科，河南新乡人，硕士在读，主要从事新型透氧膜材料及膜催化的研究工作. 通讯联系人：李其明，E-mail：lqm_dicp@163.com

Reference：

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