High CO2-tolerance oxygen permeation dual-phase membranes Ce0.9Pr0.1O2-{\delta}-Pr0.6Sr0.4Fe0.8Al0.2O3-{\delta}

TL;DR

This study develops and tests composite membranes based on Ce0.9Pr0.1O2 and Pr0.6Sr0.4Fe0.8Al0.2O3, demonstrating high oxygen permeability and stability in CO2-containing atmospheres at 1000°C, suitable for industrial oxygen supply and CO2 capture.

Contribution

The paper introduces a novel composite membrane with optimized composition that combines high oxygen permeability and stability in CO2 environments, advancing membrane materials for industrial applications.

Findings

The 60CPO-40PSFAO composition shows the highest oxygen permeability.

The membrane maintains stability and permeability after 100 hours at 1000°C in CO2 atmospheres.

Oxygen flux exceeds 1 mL cm-2 min-1 at 1000°C in air/He atmosphere.

Abstract

High stability and oxygen permeability are two prominent requirements for the oxygen transport membrane candidates used as industrialization. Herein, we report several composite membranes based on xwt.%Ce0.9Pr0.1O2(CPO)-(100-x)wt.%Pr0.6Sr0.4Fe0.8Al0.2O3(PSFAO) (x = 50, 60 and 75) prepared via a modified Pechini method. Oxygen permeability test reveals that the 60CPO-40PSFAO composition exhibits the highest oxygen permeability. The oxygen permeation flux through the optimal uncoated 0.33 mm-thickness 60CPO-40PSFAO composite can reach 1.03 mL cm-2 min-1 (over the general requirement value of 1 mL cm-2 min-1) in air/He atmosphere at 1000 {\deg}C. In situ XRD performance confirms the optimal 60CPO-40PSFAO sample shows excellent stability in CO2-containing atmospheres. The 60CPO-40PSFAO membrane still exhibits simultaneously excellent oxygen permeability and phase stability after operating for over 100 h at air/CO2 condition at 1000 {\deg}C, which further indicates that the 60CPO-40PSFAO composite is likely to be used for oxygen supply in CO2 capture