Investigation of carbonates in oxygen-transporting membrane ceramics

被引：14

作者：

Ravkina, Olga ^{[1
]}

Klande, Tobias ^{[1
]}

Feldhoff, Armin ^{[1
]}

机构：

[1] Leibniz Univ Hannover, Inst Phys Chem & Electrochem, D-30167 Hannover, Germany

来源：

JOURNAL OF MEMBRANE SCIENCE | 2015年 / 480卷

关键词：

Oxygen-transporting membrane; Carbonate formation; Long-term oxygen permeation; Transmission electron microscopy; Electron-energy loss spectroscopy; DUAL-PHASE MEMBRANES; PERMEATION PERFORMANCE; CO2; CAPTURE; MICROSTRUCTURE; SEPARATION; INTEGRATION; COMBUSTION; GENERATION; EXCHANGE; SURFACE;

D O I：

10.1016/j.memsci.2015.01.042

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The performance of perovskite-type oxygen-transporting membranes during CO2 sweeping has been investigated. The series of La1-xSr1-xCo0.8Fe0.2O3-delta (LSCE) materials with x=1. 0.8, 0.6 and 0.4 (SCF, LSCF2882, LSCF4682, LSCF6482) were synthesized by the sol-gel method and characterized by X-ray diffraction (XRD). To investigate the poisoning effect of CO2 on the phase composition and microstructure of the membranes after long-term oxygen permeation experiments (more than 200 h) at 1173 K under a CO2 atmosphere, transmission electron microscopy (TEM) investigations were carried out. Electron-energy loss spectroscopy (EELS) and energy-dispersive X-ray spectroscopy (EDXS) revealed the formation of carbonate at the outer surface of the LSCF materials with low lanthanum content, which correlates with a decrease in oxygen permeation flux. Nevertheless, the LSCF 6482 material is tolerant to CO2 gas. No carbonate layer was found after 200 h of operation, and the oxygen flux remained stable. (C) 2015 Elsevier B.V. All rights reserved

引用

页码：31 / 38

页数：8

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