Ultra-high oxygen permeable BaBiCoNb hollow fiber membranes and their stability under pure CH4 atmosphere

作者：Wang Zhigang; Kathiraser Yasotha; Soh Telong; Kawi Sibudjing^*

来源：Journal of Membrane Science, 2014, 465: 151-158.

DOI：10.1016/j.memsci.2014.04.025

• BaBi0.05Co0.8Nb0.15O3-delta (BECN)
• Highly asymmetric ceramic hollow fiber membranes
• Perovskites
• Stability in CH4
• Oxygen permeation

The ultra-high oxygen permeable BaBi(0.05)Co(0.8)b(0.15)O(3-delta) (BBCN) ceramic hollow fiber membranes have been fabricated with highly asymmetric morphology. The highest oxygen permeation flux achieved is 14.08 ml cm(-2) min(-1) at 950 degrees C with He as sweep gas. So far, this value is the highest permeation obtained under He sweep gas through hollow fiber membranes compare with all of the previously reported data under normal atmosphere oxygen partial pressure (similar to 21 kPa) without any modification. The stability of membranes in CH4 is also investigated by oxygen permeation studies and further characterized by SEM, EDX, and XPS techniques. The results show that the oxygen flux decreases around 30% under CH4 as sweep gas for the 150 h duration. However, the oxygen permeation can be almost recovered by He as sweep gas in a short time. The degeneration is mainly clue to the formation of barium carbonate on the membrane surface by the impact of CO2 which is produced from the combustion of methane.

• 出版日期2014-9-1