Chen, Guoxing ; Liu, Wenmei ; Widenmeyer, Marc ; Yu, Xiao ; Zhao, Zhijun ; Yoon, Songhak ; Yan, Ruijuan ; Xie, Wenjie ; Feldhoff, Armin ; Homm, Gert ; Ionescu, Emanuel ; Fyta, Maria ; Weidenkaff, Anke (2024)
Advancing oxygen separation: insights from experimental and computational analysis of La₀.₇Ca₀.₃Co₀.₃Fe₀.₆M₀.₁O₃₋δ (M = Cu, Zn) oxygen transport membranes.
In: Frontiers of Chemical Science and Engineering, 18 (6)
doi: 10.1007/s11705-024-2421-5
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

In this study, perovskite-type La₀.₇Ca₀.₃Co₀.₃Fe₀.₆M₀.₁O₃₋δ (M = Cu, Zn) powders were synthesized using a scalable reverse co-precipitation method, presenting them as novel materials for oxygen transport membranes. The comprehensive study covered various aspects including oxygen permeability, crystal structure, conductivity, morphology, CO2 tolerance, and long-term regenerative durability with a focus on phase structure and composition. The membrane La₀.₇Ca₀.₃Co₀.₃Fe₀.₆M₀.₁O₃₋δ exhibited high oxygen permeation fluxes, reaching up to 0.88 and 0.64 mL·min⁻¹cm⁻² under air/He and air/CO₂ gradients at 1173 K, respectively. After 1600 h of CO₂ exposure, the perovskite structure remained intact, showcasing superior CO₂ resistance. A combination of first principles simulations and experimental measurements was employed to deepen the understanding of Cu/Zn substitution effects on the structure, oxygen vacancy formation, and transport behavior of the membranes. These findings underscore the potential of this highly CO₂-tolerant membrane for applications in high-temperature oxygen separation. The enhanced insights into the oxygen transport mechanism contribute to the advancement of next-generation membrane materials.

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