|About this Abstract
||MS&T23: Materials Science & Technology
||Late News Poster Session
||O-13: Permeation of Carbon Dioxide in Tungsten-doped Lanthanum Molybdenum Oxide/Lithium-Sodium-Potassium Carbonates Dual Composite Ceramic Membranes
||Midilane Sena Medina, Sabrina Gonçalves de Macedo Carvalho, Francisco Nobuo Tabuti, Eliana Navarro dos Santos Muccillo, Fabio Coral Fonseca, Reginaldo Muccillo
|On-Site Speaker (Planned)
Single-phase tungsten-doped lanthanum molybdenum oxide (La<sub>2</sub>MoWO<sub>9</sub>) ceramic powders were synthesized using the complex polymerization technique. Porous ceramic pellets were obtained by thermally removing graphite, which served as a pore former. The porous pellets were impregnated with molten eutectic composition of lithium-sodium-potassium carbonates. The EDX analysis and FEG-SEM images of the external and fracture surfaces of the La<sub>2</sub>MoWO<sub>9</sub>-(Li,Na,K)<sub>2</sub>CO<sub>3</sub> composite dual-phase membrane revealed the percolation of the carbonate ions through the pores. Electrochemical impedance spectroscopy measurements, conducted within the temperature range below and above the melting point of the carbonates, demonstrated the contributions of oxygen and carbonate ions to the ionic conductivity of the dual membrane. The electrical conductivity of the carbonate ions within the membrane was continuously monitored for over 1300 hours with negligible degradation. A comparison of FEG-SEM images taken before and after this endurance test suggests minimal fouling, indicating that the membrane could be applied to carbon capture devices.