Direct AC heating of oxygen transport membranes

Direct AC/DC Heating of Oxygen Transport Membranes

“…As can be seen from the SEM images, the membrane surface lost its uniformity. It can be assumed that use of direct DC heating leads to degradation of the membrane, as opposed to using direct AC heating [6]. In terms of long-term experiments such difference can lead to a significant negative effect on the membrane.…”

“…BSCFM10 HFMs were produced by a phase inversion technique. The ceramic precursor was mixed with an N-methyl-2-pyrrolidone solvent (NMP) and a polysulfone binder (PSU) in a ratio of 10:4:1, respectively [6][7][8]. The slurry was homogenized and degassed by using a Dispermat®LC-55 (VMA-Getzmann, Germany) over 120 min at 1500 rpm.…”

“…Earlier [6,7], it was shown the promise of using AC (50 Hz frequency) for the direct heating of hollow fiber membranes (HFMs), which improves their performance and efficiency of temperature control. In this case, the membranes with mixed oxygen-electronic conductivity are both a heater and an oxygen separator.…”

Oxygen Exchange in MIEC Perovskite Oxide La0.6Sr0.4Co0.2Fe0.8O3−δ: Kinetic and Equilibrium Parameters and Their Interrelation

“…The first attempts to replace cations in the A and B sublattices resulted only in the stabilization of the phase composition by ⟨⟨blocking⟩⟩ structural transitions, and the transport characteristics were significantly reduced. 10−15 A positive effect of doping is observed, for example, in the case of doping with high-valent cations, where effects are observed in the values of oxygen conductivity/permeability, 16,17 resistance to CO 2 , 18−20 the formation of domain and nanostructured systems with facilitated oxygen diffusion along the phase boundaries, etc. 21−23 In order to establish the regularity of the doping effect on the kinetic and equilibrium characteristics of the oxide in oxygen exchange, a deep understanding of the mechanism of oxygen exchange itself is necessary.…”

“…Over the past decades, the study of oxygen exchange reactions in perovskite oxides with mixed ion-electron conductivity with the general formula ABO 3−δ has attracted much of attention of scientists from all over the world. − After the discovery of abnormally high oxygen conductivity in SrCo 0.8 Fe 0.2 O 3−δ in 1985, an active search for various dopants capable of improving the properties of such oxides began. The first attempts to replace cations in the A and B sublattices resulted only in the stabilization of the phase composition by ⟨⟨blocking⟩⟩ structural transitions, and the transport characteristics were significantly reduced. − A positive effect of doping is observed, for example, in the case of doping with high-valent cations, where effects are observed in the values of oxygen conductivity/permeability, , resistance to CO 2 , − the formation of domain and nanostructured systems with facilitated oxygen diffusion along the phase boundaries, etc. − …”