Development, performance and stability of sulfur-free, macrovoid-free BSCF capillaries for high temperature oxygen separation from air

作者：Buysse C^*; Kovalevsky A; Snijkers F; Buekenhoudt A; Mullens S; Luyten J; Kretzschmar J; Lenaerts S

来源：Journal of Membrane Science, 2011, 372(1-2): 239-248.

DOI：10.1016/j.memsci.2011.02.011

• BSCF
• Oxygen permeation
• Capillary membrane
• Phase-inversion spinning
• Macrovoid-free
• Sulfur-free

Capture and storage of CO(2) (CCS) from fossil-fuel power plants is vital in order to counteract a pending anthropogenic global warming. High temperature oxygen transport perovskite membranes can fulfill an important role in the separation of oxygen from air needed in the oxy-fuel technologies for CCS. In this study we present the development, performance and stability of gastight, macrovoid-free and sulfur-free Ba(0.5)Sr(0.5)Co(0.8)Fe(0.2)O(3-delta) (BSCF) mixed conductor capillary membranes prepared by phase-inversion spinning and sintering. A sulfur-free phase-inversion polymer was chosen in order to obtain a phase-pure BSCF crystal phase. Special attention was given to the polymer solution and ceramic spinning suspension in order to avoid macrovoids and achieve gastight membranes. The sulfur-free BSCF capillaries showed an average 4-point bending strength of 64 +/- 8 MPa and a maximum oxygen flux of similar to 5.3 Nml/(cm(2) min) at 950 degrees C for an argon sweep flow rate of 125 Nml/min. The comparison of the performance of sulfur-free and sulfur-containing BSCF capillaries with similar dimensions revealed a profound impact of the sulfur contamination on both the oxygen flux and the activation energy of the overall oxygen transport mechanism. Both long-term oxygen permeation at different temperatures and post-operation analysis of a sulfur-free BSCF capillary were performed and discussed.

• 出版日期2011-4-15