Design and experimental investigation of oxide ceramic dual-phase membranes

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

“…All the dualphase composite oxides contain a fluorite phase and a perovskite phase, and no impurities. That is to say, the two phases are chemically compatible with each other as reported in our previous investigations [45][46][47][48][49][50][51]. For the cobalt-containing dual-phase membranes, the diffraction peaks strength of SCC perovskite is very weak and only the diffraction peaks at 33.61, 48.31 and 60.31 can be detectable, which indicates that few perovskite grains are exposed on surfaces of the as-prepared membranes.…”

“…The higher permeation flux of SDC67-SCC33 is related to the higher oxygen exchange rate of the cobalt-based perovskite adopted in SDC67-SCC33. In our previous investigation, we found that the oxygen exchange reactions on both surfaces have great influence on the permeation fluxes of dual-phase membranes, and the permeation fluxes can be improved by 40-100% by coating cobalt-based perovskite oxides, such as (La,Sm) 1À x Sr x CoO 3À δ , as the oxygen exchange catalysts [50,51].…”

“…For these dual-phase membranes, the ionic transport path is more or less blocked by the pure electronic conducting phase, so the permeation fluxes are usually low. The higher permeation flux results from the fact that our dual-phase membranes comprise an ionic conductor for ionic transport and a mixed conductor for both ionic and electronic transport, in which the mixed conductor does not block but help the transport of oxygen ions across the membranes [7,[45][46][47][48][49][50][51]. investigation.…”

“…According to our previous investigations, the optimal weight ratios between fluorite phase and perovskite phase usually fall in the range of 3:1-2:1 [45,51], so the ratios of 3:1 and 2:1 were chosen in this investigation. The structural stability under CO 2 atmosphere, permeation flux and permeation stability of these dual-phase membranes were experimentally studied in detail.…”

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

“…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]. These dual-phase materials showing higher stability and permeability than traditional dual-phase membranes were designed for syngas production in membrane reactors [7,29,30].…”