Hydrogen separation through LSF-perovskite membrane prepared by chelating method

• A La0.3Sr0.7FeO3−δ perovskite membrane was prepared applying a new ligand.
• The hydrogen separation using LSF membrane from a gas stream was measured for the first time.
• A remarkable increase in the hydrogen permeation was observed.
• A bulk diffusion mechanism was considered for this permeation.

La0.3Sr0.7FeO3−δ (LSF) perovskite was prepared according to two methods: (1) applying new phenolic derivative of serine amino acid (L) as chelating agent, and (2) in absence of L as ligand-free perovskite (LFP). The newly prepared aminophenolic ligand L was fully characterized by 1H and 13C NMR, IR as well as elemental analysis while the LSF perovskite samples were characterized using the IR spectra, powder x-ray diffraction (PXRD) patterns, and SEM micrographs. The PXRD pattern obtained for the perovskite prepared by L (PPP) indicated on the presence of pure perovskite phase. The hydrogen permeation through PPP and LFP membranes with thickness of 1.0 mm were measured as a function of temperature within 973–1223 K while hydrogen partial pressure was constantly kept at 0.5 bar. The hydrogen flux of PPP and LFP membranes were measured as 0.043 and 0.033 mL/min cm2 at the operating temperature of 950 °C. The effect of grain size distribution on hydrogen permeation through PPP and LFP perovskites was investigated. To the best of our knowledge, this is the first report on hydrogen permeation through LSF dense membranes. Experimentally, the hydrogen flux rate through PPP represented a sharper increase in comparison with LFP.

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