Our group found the effect of phase ratio on hydrogen separation of dual-phase membrane reactors. Recently, dual-phase oxygen permeable membranes reactors have been proposed for hydrogen separation and achieved excellent hydrogen separation performance. Researchers have developed numerous dual-phase membrane materials with excellent hydrogen separation performance and stability. However, the effect of phase ratio on hydrogen separation of dual-phase membrane reactors is unclear. Therefore, A series of new dual-phase membrane materials SDC-STF with different ratios were synthesized by a simple one-pot solid state reaction method to explore the effect of the ratio of the two phases on the microstructure, conductivity and hydrogen separation performance of dual-phase membrane reactors. The dual-phase membranes only consist of a fluorite phase and a perovskite phase and the sintered membranes have relatively high densities. Conductivity test result reveals that the total conductivity of dual-phase membranes is higher than that of STF and it decreases with the increase of STF content. Dual-phase membranes have higher total conductivity in a stronger reducing atmosphere. The performances of these membranes were evaluated under different oxygen partial pressures of the two sides, respectively. The single-phase STF membrane has the lowest hydrogen separation performance. With the increase of the perovskite phase in the dual-phase membranes, the hydrogen separation rates of the dual-phase membranes decrease, i.e., 70SDC-30STF has the highest hydrogen separation performance in this study. Based on the total conductivity and hydrogen separation performance, we deduce that the hydrogen separation process of dual-phase membrane reactors is limited by ambipolar diffusion of oxygen ions and electrons in the membrane bulk, suggest that more ceria phase and thinner membrane are better for the improvement of hydrogen separation rate. This work has been published in Chemie Ingenieur Technik.

The article links:https://doi.org/10.1002/cite.202100119