High CO2 permeability of ceramic-carbonate dual-phase hollow fiber membrane at medium-high temperature

Abstract CO2 separation through ceramic-carbonate dual-phase membrane from various industrial carbon sources has become a promising way to solve the high-temperature CO2 emission. In this study, we synthesize Ce0.8Sm0.2O2-δ(SDC)-carbonate dual-phase hollow fiber membranes using phase inversion method to separate CO2 under different feed conditions at high temperature. The SDC-carbonate hollow fiber membranes show not only high CO2 permeation flux but also stable permeation behavior during the test process. The maximum CO2 permeation flux reaches up to 4.78, 5.46 and 1.79 ml min−1·cm−2 under the feed condition of 50%CO2–50%N2, 5%H2-47.5%CO2-47.5%N2 and 5%O2–20%CO2–75%N2, respectively, at 700 °C. These results are the highest CO2 permeation flux of the ceramic-carbonate membrane under the similar operation conditions in recent years. The excellent CO2 fluxes can be attributed to a unique and superior structure and a thinner thickness of the hollow fiber membrane. In addition, the membrane shows a stable time with 85 h during the long-term test process in a 50%CO2–50%N2 feed stream.