Novel CO₂-tolerant Al-containing membranes for high-temperature oxygen separation

Abstract

(NSAF5528-CN82) were successfully synthesized via a one-pot sol-gel method. The oxygen permeation performance and the structural properties of the membranes could be simultaneously improved owing to Al doping of the perovskite phase. The newly developed dense ceramic membranes (0.6 mm thick) displayed long-term stable oxygen permeation fluxes of 0.31 and 0.51 cm 3 min À1 cm À2 under an air/CO 2 oxygen partial pressure gradient at 950 C for NSAF6428-CN91 and NSAF5528-CN82, respectively. The NSAF6428-CN91 showed a stable oxygen flux of 0.15 cm 3 min À1 cm À2 at 900 C for 100 h, without any deterioration of the microstructure under pure CO 2 sweeping.

High CO2-tolerance oxygen permeation dual-phase membranes Ce0.9Pr0.1O2--Pr0.6Sr0.4Fe0.8Al0.2O3-

“…Unfortunately, most reports confirmed that the oxygen permeation rate decreased after doping aluminum in the single lanthanum-based or strontium-based perovskite oxides except for the (Ba0.5Sr0.5)(Fe1-xAlx)O3- and Ba0.5Sr0.5Co0.8Fe0.1Al0.1O3- system [30][31][32][33][34][35][36][37][38][39][40][41]. However, the oxygen permeability and the thermochemical stability under reducing atmospheres or corrosive (such as CO2) atmosphere have both been enhanced with the substitution of Al at the B-site of OIC in the dual-phase OTM case [42][43][44]. More recently, J. Caro group have developed a novel CO2-stable 60wt.%Ce0.9Pr0.1O2--40wt.%Pr0.6Sr0.4FeO3- (denoted as 60CPO-40PSFO) composite material [45].…”

Zr‐ and Tb‐doped barium cerate‐based cermet membrane for hydrogen separation application

“…A worldwide rapid climate change due to fast depletion of fossil fuels forced to review the existing power generation technologies and also demanded to explore new power sources for producing clean and renewable energies . In this context, pure hydrogen is considered to be an attractive alternative for future energy source .…”

Effects of Al content on the oxygen permeability through dual-phase membrane 60Ce0.9Pr0.1O2--40Pr0.6Sr0.4Fe1-Al O3-

“…δ-40wt.%Nd0.6Sr0.4Fe0.8Al0.2O3-δ exhibited higher oxygen permeability and much more stability in comparison to CNO-NSFO [30,31]. Zhu group is doped with Al on the basis Ce0.85Sm0.15O1.925-Sm0.6Sr0.4Al0.3Fe0.7O3-δ exhibits high oxygen permeability and stability and can work stably for a long time in the membrane reactor for the partial oxidation of methane [32][33][34].…”