Synthesis and Characterization of 40 wt % Ce_0.9Pr_0.1O_2--60 wt % NdSr_1-Fe_0.9Cu_0.1O_3- Dual-Phase Membranes for...

Dense, H₂- and CO₂-resistant, oxygen-permeable 40 wt % Ce_0.9Pr_0.1O_2--60 wt % NdSr_1-Fe_0.9Cu_0.1O_3-dual-phase membranes were prepared in a one-pot process. These Nd-containing dual-phase membranes have up to 60% lower material costs than many classically used dual-phase materials. The Ce_0.9Pr_0.1O_2--Nd_0.5Sr_0.5Fe_0.9Cu_0.1O_3- sample demonstrates outstanding activity and a regenerative ability in the presence of different atmospheres, especially in a reducing atmosphere and pure CO₂ atmosphere in comparison with all investigated samples. The oxygen permeation fluxes across a Ce_0.9Pr_0.1O_2--Nd_0.5Sr_0.5Fe_0.9Cu_0.1O_3- membrane reached up to 1.02 mL min^-1 cm^-2 and 0.63 mL min^-1 cm^-2 under an air/He and air/CO₂ gradient at T = 1223 K, respectively. In addition, a Ce_0.9Pr_0.1O_2--Nd_0.5Sr_0.5Fe_0.9Cu_0.1O_3- membrane (0.65 mm thickness) shows excellent long-term self-healing stability for 125 h. The repeated membrane fabrication delivered oxygen permeation fluxes had a deviation of less than 5%. These results indicate that this highly renewable dual-phase membrane is a potential candidate for long lifetime, high temperature gas separation applications and coupled reaction-separation processes.