Temperature dependence of Cr impurity in La 0.6 Sr 0.4 Ti 0.3 Fe 0.7 O 3-δ coated Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3- δ ion conducting membrane for oxygen separation

Yu Gang Park, Jung Hoon Park

Research output: Contribution to journalArticlepeer-review

Abstract

La 0.6 Sr 0.4 Ti 0.3 Fe 0.7 O 3-δ (LSTF) coated Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ (BSCF) membranes which has properties of high oxygen permeability and stability to CO 2 were applied to a bench scale apparatus to conduct oxygen permeation experiments. Also, the membranes of the laboratory and the bench scale device were divided into three regions according to the temperature gradient in the membrane reactor for comparative analysis. While oxygen permeation experiment were conducted up to 900 o C, temperature dependence of Cr deposition was investigated. As a result, it was confirmed that the oxygen permeability was 2.37 ml/min·cm 2 , which was significantly lower than 3.79 ml/min·cm 2 measured in the laboratory apparatus. It was found through XRD and SEM/EDS analysis that the decrease in oxygen permeability was originated from the deposition of gaseous Cr on the membrane surface released from the alloy material of the housing. In particular, a large amount of Cr was found in the medium temperature region.

Original languageEnglish
Pages (from-to)11-16
Number of pages6
JournalKorean Chemical Engineering Research
Volume57
Issue number1
DOIs
StatePublished - Feb 2019

Keywords

  • BSCF
  • Cr impurity
  • Membrane
  • Oxygen separation
  • Perovskite

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