Effect of A-site lanthanum doping on the CO2 tolerance of SrCo0.8Fe0.2O3−-δ oxygen-transporting membranes

Investigation of carbonates in oxygen-transporting membrane ceramics

“…These results are in agreement with the SEM/EDXS results published by Klande et al [24] concerning the SCF membrane surface after using CO 2 as a sweeping gas for 24 h. It was shown that a change in composition of the surface material compared to the bulk took place, and that the top layer was depleted of cobalt and iron. Analysis of the fractured surface revealed a 25 mm carbon-rich layer close to the sweep side [24]. Investigation of the polished SCF membrane cross-section enables an accurate estimation of the decomposition layer thickness, which explains the deviation in the carbonate layer thickness.…”

“…Nevertheless, a more detailed investigation of the CO 2 poisoning mechanism and microstructure changes for the LSCF series is required. In this study, we extend our previous work [24] and report a more detailed study of these compositions with respect to long-term oxygen permeation under carbon dioxide atmospheres. The results were correlated with the microstructure using transmission and scanning electron microscopy techniques.…”

“…The crystal structure of each powder and membrane was analyzed by X-ray diffraction (XRD) using a Bruker-AXS D8 Advance diffractometer with Cu K α radiation as shown by Klande et al [24].…”

“…The effect of A-site doping on the CO 2 tolerance of the materials was investigated [24]. It has been shown that using pure CO 2 as the sweep gas causes a halt in oxygen permeation flux after 30 h of operation for SCF, after 200 h for LSCF 2882 and after 60 h for LSCF 4682.…”

A CO2-stable reduction-tolerant Nd-containing dual phase membrane for oxyfuel CO2capture

“…On the other hand, it has been reported that a phase transition occurs at moderate and high temperatures in the Co-containing single phase perovskite OTM materials, also for some dual phase membranes. 26,34 However, no carbonate formation or phase transition could be observed in our dual phase membrane 40NSFO-60CNO in an atmosphere of 50 vol% CO 2 and 50 vol% N 2 in the temperature range of 30 C and 1000 C suggesting that the dual phase membrane 40NSFO-60CNO is thermally and chemically stable both in air and in CO 2 up to 1000 C. The long-time stability of the oxygen ux with pure CO 2 as the sweep gas also conrmed the stability of our dual-phase membrane in CO 2 (Fig. 6).…”