Year-end Sale % OFF 
Abstract
The application of CeO2-δ-molten carbonate (MC) dual-phase membranes is limited by low CO2 permeation at high temperatures due to poor oxygen ionic conductivity. Ce1-xGdxO2-δ-MC (x = 0.00–0.03) dual-phase membranes were designed to investigate the effects of Gd-doping on the ion transport capacity and CO2 permeability. The introduction of Gd3+ promotes the conversion of some Ce4+ to Ce3+, initially increasing and then decreasing the Ce3+/Ce4+ ratio. This process increases the oxygen vacancy content, with Ce0.8Gd0.2O2-δ showing the highest concentration of oxygen vacancies. At 850 °C, the CO2 permeation flux of the Ce0.8Gd0.2O2-δ-MC membrane is more than twice higher than that of CeO2-δ-MC, increasing from 0.17 to 0.58 mL min−1 cm−2. Moreover, the microstructure of the Ce0.8Gd0.2O2-δ support is regulated using pore formers of different particle sizes, increasing porosity from 24.3 % to 45.7 %. Consequently, the CO2 permeation flux of the Ce0.8Gd0.2O2-δ-MC dual-phase membrane rises from 0.29 to 0.75 mL min−1 cm−2 at 850 ℃ after optimizing the microstructure of the membrane. Furthermore, the long-term permeation test demonstrates excellent chemical stability of the dual-phase membrane. This study provides feasible modification strategies to enhance CO2 separation.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
