Investigation of Ba fully occupied A-site BaCo0.7Fe0.3−xNbxO3−δ perovskite stabilized by low concentration of Nb for oxygen permeation membrane

Zirconium stabilized Ba0.5Sr0.5(Co0.8−xZrx)Fe0.2O3−α perovskite hollow fibre membranes for oxygen separation

“…As the Zr-doping content is increased to 0.3, the lattice parameter (a) of the perovskite increases to 0.3991 nm. Furthermore, the substitution of larger Zr 4+ for Co cations also causes the shift of the perovskite peaks of the composite to the lower angle direction [7,31]. As can be …”

“…Among various types of MIEC membranes, the perovskites derived from SrCoO 3Àd (SC) by partial substitution of cobalt with higher valency transition metal cations such as Fe, Cr and Ti exhibit noticeably higher oxygen permeability in comparison with other structures, because the strontium at A-site induces the formation of oxygen vacancies while the cobalt ions at Bsite facilitate fast diffusion of oxygen within the oxide bulk and fast oxygen surface exchange kinetics due to the small binding energy with oxygen [5][6][7]. For example, SrCo 0.8 Fe 0.2 O 3Àd (SCF) membrane possess as high as 0.0231 mol m À2 s À1 oxygen permeation flux at 850 8C [8].…”

Perovskite-type oxygen-permeable membrane BaCo0.7Fe0.2Nb0.1O3−δ for partial oxidation of methane in coke oven gas to hydrogen

“…5 because of the very low intensity of the additional reflections. The introduction of Nb could stabilize the perovskite structure of BCFNO under low oxygen partial pressure [15][16].…”

“…The BCFNO membrane was tested in a methane conversion reactor with a high oxygen permeation flux of over 20 mL⋅cm −2 ⋅min −1 at 1173 K for 300 h [14]. The efficacious structural stabilization effect of Nb on the perovskite BaCo 0.7 Fe 0.3 O 3−δ has been studied extensively [15]. Our group investigated total conductivity, oxygen sorption property, oxygen permeability, and stability of pure perovskite-type oxide BCFNO in real operating conditions [16].…”

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

“…Phase decomposition and carbonates formation are frequently reported on these membranes [23,24]. Many efforts were focused on the improvement of the stability of the perovskite membranes by preparing cobalt-free perovskite materials and doping less reducible ions in the B-site of the perovskite, such as Al [36,37], etc. All the investigation shows that the doping is efficient to improve the stability of the membranes but at the cost of permeability [29,32].…”