Air separation using a catalytically modified mixed conducting ceramic hollow fibre membrane module

摘要: Abstract A membrane reactor module consisting of four gas-tight hollow fibre membranes made the mixed ionic-electronic conducting perovskite La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 −  δ has been tested for oxygen permeation in temperature range 650–1000 °C with air on one side and helium other. The was operated under gradientless gas-phase conditions absence mass transfer limitations at lower temperatures. Also rate-determining step found to be reduction performance being significantly enhanced by deposition a porous platinum catalyst film onto air-side membranes. stable but limited flux 0.56 μmol cm −2  s −1 (0.73 ml STP cm  min ) achieved after period 4 days operation 1000 °C continued this rate further days. non-mass ca 0.14 μmol cm obtained 800 °C. 500 h before onset significant leakage. Post qualitative analysis indicated localised changes stoichiometry no discernable trend, quantitative other hand revealed that had retained its starting composition. Post-operation presence sulfur form sulfates strontium, cobalt calcium change surface microstructure both air- lumen-side surfaces. Possible sources contamination are: glass-ceramic sealing material employed, sweep gas atmospheric dioxide. This may contribute decrease long-term rates. metal cation showed areas following studies.