Novel La _0.7 Sr _0.3 FeO _{3 − δ} /(La _0.5 Sr _0.5 ) ₂ CoO _{4 + δ} composite hollow fiber membrane for O ₂ separation with high CO ₂ resistance

Abstract

Recently, the reported Perovskite/Ruddlesden-Popper composite with significant improvement of oxygen surface kinetics has been adopted into gas separation process. Here, we report a novel La 0.7 Sr 0.3 FeO 3 − δ /(La 0.5 Sr 0.5 ) 2 CoO 4 + δ (LSF-LSC) composite hollow fiber membrane (HFM), which was characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and thermal expansion test, etc. The O 2 permeation test results indicated that, under sweeping gas of pure He (100 mL min −1 ), the composite HFM exhibited the superior O 2 permeability (0.72 mL min −1 cm −2 ) at the temperature of 950°C with respect to the single La 0.7 Sr 0.3 FeO 3 − δ (LSF) membrane, acid-etched membrane, and (La 0.5 Sr 0.5 ) 2 CoO 4 + δ (LSC)-coated membrane. Moreover, the composite membrane exhibited high CO 2 tolerance as well as phase stability. The generation of hetero-interface between Ruddlesden-Popper phase and perovskite phase could be responsible for the improvement of the oxygen transportation over the fabricated composite membrane.

Experimental study on water recovery and SO 2 permeability of ceramic membranes with different pore sizes

“…In addition to provide cooling load, the system used LiCl solution as absorbent to extract water from the atmosphere. Han et al 7 adopted a new La 0.7 Sr 0.3 FeO 3−δ /(La 0.5 Sr 0.5 ) 2 CoO 4+δ composite hollow fiber membrane to separate oxygen. Xu et al 8 used porous metal organic framework (MOF)-205 to separate carbon dioxide from hydrogen and methane.…”

Insight into Steam Permeation through Perovskite Membrane via Transient Modeling

“…Perovskite oxides with special physical characteristic are widely applied in membrane separation (oxygen/hydrogen/carbon dioxide separation membranes) [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ], fuel cells [ 22 , 23 , 24 ], and other environment-related application areas [ 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 ]. Up to now, many studies have focused on the mechanism of perovskite oxide membrane for high-temperature gas separation in practical experiments; however, the research on the simulation of the gas separation process is still limited and inadequate.…”