Ca-containing CO2-tolerant perovskite materials for oxygen separation

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

“…But the chemical stability of the perovskite-type membrane material strongly depends on the A and/or B-site composition as well. Thus, the primary approach used to improve the CO 2 stability of the perovskite-type materials is to modify the composition by doping other metals into the 42 can be obtained by doping a less basic alkaline-earth metal or non-alkaline earth metals (such as La, Ca). [40][41][42][43] In our study the 40NSFO-60CNO membrane has good reversibility of the oxygen permeation uxes and good chemical stability in a CO 2 atmosphere.…”

Oxygen permeation through Ca-contained dual-phase membranes for oxyfuel CO2 capture

“…For example, the oxygen permeation flux of LaCoO 3 perovskite was less than 0.03 mL cm À2 min À1 for a 0.41 mm thick membrane at 1000°C [25], and the oxygen permeation fluxes of LaGa 1ÀxÀy Co xMg y O 3Àd membranes were no larger than 0.05 mL cm À2 min À1 for the 1.0 mm thick membranes at 950°C, while the permeation fluxes of the Ba 2+ and Sr 2+ doped LaCoO 3Àd perovskite-type MIEC membranes were usually more than ten times higher than that of the parent membranes [26,27]. Therefore, the doping of alkaline earth metal ions in the perovskite A-site is important for MIEC [28], and found that the membranes were stable for oxygen permeation when CO 2 was used as the sweeping gas at temperature 850°C. However, the permeation flux reduced from 0.26 to 0.16 mL cm À2 min À1 at 900°C when the sweeping gas switched from He to CO 2 .…”

“…However, the permeation flux reduced from 0.26 to 0.16 mL cm À2 min À1 at 900°C when the sweeping gas switched from He to CO 2 . The great reduction was attributed to the adsorption of CO 2 on the membrane surface, so as to retard the oxygen exchange rate [28]. [29][30][31].…”

Comparative investigation of dual-phase membranes containing cobalt and iron-based mixed conducting perovskite for oxygen permeation

“…As a result, high permeability has been achieved. [53], and found that the membranes were stable for oxygen permeation when CO 2 was used as the sweep gas at temperature 900 1C.…”

“…Many investigations have revealed that Fe-and Co-based mixed conducting perovskite membranes show great differences in permeation performance, electric conduction properties, stability and microstructure [4,11,26,44,53]. However, these differences are not clear when Fe-and Co-based perovskite oxides are employed in dual-phase membranes.…”