Here, Ba0.9Co0.7Fe0.2Nb0.1O3−δ perovskite was prepared by introducing A-site deficiency into BaCo0.7Fe0.2Nb0.1O3−δ and expected to enhance the stability and as well as the oxygen permeability. Under an air/helium oxygen gradient, the oxygen permeation flux of 1mm thick Ba0.9Co0.7Fe0.2Nb0.1O3−δ membrane was 1.8ml.min−1cm−2 at 875C, which was slightly higher than that of BaCo0.7Fe0.2Nb0.1O3−δ membrane under the similar condition. A 400h durability test of Ba0.9Co0.7Fe0.2Nb0.1O3−δ membrane for POM reaction at 875C showed no degradation in the measured oxygen permeation flux and methane conversion, which indicated that Ba0.9Co0.7Fe0.2Nb0.1O3−δ had a significantly better stability than BaCo0.7Fe0.2Nb0.1O3−δ and could be a promising material for oxygen generator.

Oxygen Permeation and Partial Oxidation of Methane Reaction in Ba0.9Co0.7Fe0.2Nb0.1O3-δ Oxygen Permeation Membrane. S.Song, P.Zhang, M.Han, S.C.Singhal: Journal of Membrane Science, 2012, 415-416, 654-62