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

CeSmO–SmSrAlFeO (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 cm at 950°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 sweep conditions.