The effect of A-site element on CO2 resistance of O2-selective La-based perovskite hollow fibers

Abstract

Oxygen-selective mixed ionic-electronic conducting (MIEC) ceramic membrane technology enables clean coal combustion and membrane reactor for green chemical synthesis. To be practical in these applications that involve CO2 presence, the membrane materials should have simultaneously high CO2 resistance and oxygen permeation fluxes. This work probed these properties for the perovskite oxide family of La0.6X0.4FeO3-d (X=Mg, Ca, Sr, or Ba), i.e., La0.6Mg0.4FeO3-d (LMF), La0.6Ca0.4FeO3-d (LCF), La0.6Sr0.4FeO3-d (LSF), and La0.6Ba0.4FeO3-d (LBF) in the hollow fiber membrane geometry that is highly suitable for industrial application. LCF hollow fiber displayed the best balance in CO2 resistance and oxygen permeation fluxes.