Cobalt-free SrFe1−xMoxO3-δ perovskite hollow fiber membranes for oxygen separation

SrFe0.95Mo0.05O3-δ (SFM5) perovskite hollow fiber (HF) membranes with a finger-like structure were fabricated by a phase inversion technique. The oxygen flux through SFM5 hollow fiber membrane was evaluated and reached 0.64 μmol/cm2 *s at T = 880 °C, which is 5 times higher than that of a disk SFM5 membrane (0.12 μmol/cm2 *s). A further increase in oxygen fluxes was attained by Ag deposition on the inner surface of SFM5 hollow fiber membrane. The oxygen flux of SFM5 HF membranes is governed by surface-exchange reactions on the permeate side. The equilibrium "3 − δ − lg pO2 − T" diagrams showed that doping of SF by molybdenum leads to a broadening of the cubic perovskite phase stability region.