Structural stability and oxygen permeability of BaCo0.7Fe0.2M0.1O3 − δ (M = Ta, Nb, Zr) ceramic membranes for producing hydrogen from coke oven gas

• B-site doping has a great influence on the performance of BaCo0.7Fe0.2M0.1O3 − δ.
• The highest oxygen permeation flux of 14.65 ml min− 1 cm− 2 was achieved in this work.
• The high-temperature phase change of the BCFZ was observed by TG-DSC.

The perovskite-type oxygen-transporting membranes of BaCo0.7Fe0.2M0.1O3 − δ (M = Ta, Nb, Zr) were prepared by solid state reaction methods and used for producing hydrogen from coke oven gas (COG). The structural stability of the membranes was characterized systematically using XRD, H2-TPR, O2-TPD, TG–DSC, and SEM-EDXS. Meanwhile, the oxygen permeation flux of the membranes was measured at different temperatures under He or CO2 containing atmosphere. It can be concluded that the Ta-substituting BaCo0.7Fe0.2M0.1O3 − δ is a promising candidate of the membrane materials for producing hydrogen through the catalytic partial oxidation of COG.