Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
633001 | Journal of Membrane Science | 2015 | 8 Pages |
Abstract
The performance of perovskite-type oxygen-transporting membranes during CO2 sweeping has been investigated. The series of La1âxSr xCo0.8Fe0.2O3âδ (LSCF) 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.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Filtration and Separation
Authors
Olga Ravkina, Tobias Klande, Armin Feldhoff,