Dual-phase inorganic membrane for high-temperature carbon dioxide separation

Carbon dioxide was produced in many industrial applications such as coal-burning power plant. CO2 separation from the hot flue gas is a key technology to reduce green house gas. This research is aimed at synthesis of a new inorganic dual-phase carbonate membrane for high temperature (>400°C) CO2 separation.;It is well known that molten carbonate has high CO3 2- ion conducting properties from the research on the molten carbonate fuel cell (MCFC). From the extension of MCFC, the concept of dual-phase membrane was introduced in this research. This membrane consists of a porous solid phase and a molten carbonate phase. The solid phase serves as an electronic conductor and molten carbonate phase serves as an ionic transport channel. Metal-carbonate dual-phase membranes were prepared by the direct infiltration method with Li/Na/K (42.5/31.5/25 mol.%) carbonate mixture and porous stainless steel support. The surface of the membrane was characterized by SEM/EDS and XRD. Gas tightness was checked with helium permeation at room temperature. Permeance for different gases was measured at different temperature (450∼750°C). (Abstract shortened by UMI.)...