Preparation and oxygen permeability of BaCo0.7Fe 0.2Nb0.1O3- δ Membrane Modified by Ce0.8Y0.2O2- δ porous layer on the air side

Abstract

BaCo0.7Fe0.2Nb0.1O3- δ (BCFN) dense ceramic membrane with submicron-Ce0.8Y0.2O2-δ (YDC) porous layer was investigated by the partial oxidation of coke oven gas (COG) in hydrogen production. XRD analysis showed this composite had good stability and no chemical reaction at high temperature. SEM and TEM characterization further showed BCFN membrane was uniformly modified by YDC porous layer (about 56 m thickness) formed by the accumulation of relative nanoparticles. At the respective COG flux and air flux of 108 mL/min and 173 mL/min, the oxygen permeation flux of BCFN modified by submicron-YDC porous layer reached 16.62 mL·min-1·cm-2, which was about 23.5% higher than that of pure BCFN membrane. Therefore, submicron-YDC porous layer obviously improved the oxygen permeation flux of BCFN membrane and its stability at 875°C. © 2013 Yuan Qiang et al.