Abstract
In this study, 60 wt% Ce 0.8 Sm 0.2 O 2– δ –Ba 0.95 La 0.05 Zr 0.1 Fe 0.9– x Co x O 3– δ (SDC–BLZFC, x = 0–0.4) dual–phase oxygen transport membranes were prepared by a combined EDTA–citrate complexing sol–gol method. The effects of partial substitution of iron by cobalt on the crystal structure, phase structural stability, oxygen permeation flux and CO 2 –tolerance were systematically investigated by XRD, TG and oxygen permeation experiment. The sample with x = 0.4 had the highest oxygen permeation flux of 0.42 ml min -1 cm -2 in He, while decreased most sharply after switching into pure CO 2 . The result of sample with x = 0 was opposite. From all results, it could indicate that Co–doping contributes to oxygen permeation flux in inert gases and phase structural stability, but would reduce the CO 2 –tolerance of SDC–BLZFC dual–phase membranes.
Highlights
Dual–phase oxygen transport membranes (OTMs), consisting of perovskite–type membranes as electronic conducting phase (EC phase) and fluorite–type membranes as ionic conducting phase (IC phase), have been attracted great attention in the capture and storage of carbon[1,2,3]
The results show that Co–doping is unfavorable to CO2–tolerance of SDC–BLZFC dual–phase membranes
Oxygen permeation fluxes through the 1.0 mm dense SDC–BLZFC membrane disks at different temperatures under air/He gradient are presented in Fig. 2 (a)
Summary
Dual–phase oxygen transport membranes (OTMs), consisting of perovskite–type membranes as electronic conducting phase (EC phase) and fluorite–type membranes as ionic conducting phase (IC phase), have been attracted great attention in the capture and storage of carbon[1,2,3]. Cobalt–containing oxides have a large drawback while none of the oxygen permeation flux could reach the level of cobalt–containing materials[4,5]. A series of 60 wt% Ce0.8Sm0.2O2–į–40 wt% Ba0.95La0.05Zr0.1Fe0.9–xCoxO3–į (SDC–BLZFC) dual–phase OTMs with SDC (as the IC phase) and BLZFC (as the EC phase) were fabricated. The effects of cobalt substitution on the structure stability, chemical compatibility between the two phases, oxygen permeability and carbon dioxide tolerance of SDC–BLZFC were systemically studied
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