New approaches for enhancement of oxygen fluxes on hollow fiber membranes

Hollow fiber (HF) membranes composed of Ba0.5Sr0.5Co0.78W0.02Fe0.2O3-delta (BSCFW2) were prepared by the phase inversion technique. The maximum measured oxygens flux through BSCFW2 HF membranes was 10.4 ml/(min*cm(2)) at T= 900 degrees C and pO(2,1) = 0.7 atm. Study of the dependence of oxygen fluxes through BSCFW2 HF on temperature (T= 800-900 degrees C) and oxygen partial pressure on the feed side (pO(2,1)= 0.1-0.7 atm) was performed. It was shown that the rate-determining step of oxygen permeability is the kinetics of surface reactions with activation energy of 135 +/- 10 kJ/mol for furnace heating and 90 +/- 5 kJ/mol for current heating. (C) 2017 Elsevier Ltd. All rights reserved.