CO2-resistant SDC-SSAF oxygen selective dual-phase hollow fiber membranes

Ce0.85Sm0.15O1.925-Sm0.6Sr0.4Al0.3Fe0.7O3-delta(SDC-SSAF) hollow fiber membranes aimed for oxyfuel application are fabricated via a phase inversion-sintering technique using powders synthesized from EDTA-citrate complex method. Oxygen ions transport is revealed to be the limiting step that determines the overall oxygen transport rate in SDC-SSAF. SDC-SSAF hollow fiber membrane attained a maximum flux of 2.6 ml min(-1)cm(-2)at 950 degrees C under an oxygen partial pressure difference of 1/0.02 atm (feed/permeate). Variation in oxygen partial pressure on the permeate side exerts larger influence on the oxygen permeation flux relative to the change on the feed side. Stability tests over 100 h demonstrate stable oxygen permeation flux under both He and CO(2)sweep conditions.