A layered perovskite La1·5Sr0·5NiO4±δ-molten carbonate dual-phase membrane for CO2 capture from simulated flue gas

Abstract

The ceramic-molten carbonate (MC) dual-phase membrane is a promising technology for CO 2 capture since the continuously operation and easily coupling with the CO 2 conversion process. In this work, an iron free layered perovskite K 2 NiF 4 structure La 1·5 Sr 0·5 NiO 4±δ (LSN) was used to prepare the LSN-MC dual-phase membrane for CO 2 capture from the simulated flue gas. The crystal structure, chemical compatibility, morphology, permeation performance and stability of the dual-phase membrane were systematically investigated. The results show that LSN is chemical compatible with the molten carbonate phase and chemical stable in the simulated flue gas. The CO 2 permeance of the prepared LSN-MC dual-phase membrane was 5.7 × 10 −7 mol s −1 m −2 Pa −1 at 850 °C. With a simulated flue gas as the feed gas, the prepared LSN-MC membrane shows no obvious degradation within 75 h operation. These results demonstrate that the LSN-MC dual-phase membrane is promising for CO 2 capture from the simulated flue gas. • There are two CO 2 transport routes in the LSN-MC membrane. • CO 2 permeance of 5.7 × 10 −7 mol s −1 m −2 Pa −1 was obtained at 850 °C. • The CO 2 permeation performance is stable at 850 °C during 75 h operation.