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  4. Permeation improvement of LCCF hollow fiber membranes by spinning and sintering optimization
 
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2021
Journal Article
Title

Permeation improvement of LCCF hollow fiber membranes by spinning and sintering optimization

Abstract
The effects of grain size and wall thickness on the oxygen transport mechanism of (La0.6Ca0.4)(Co0.8Fe0.2)O3-d hollow fiber membranes were investigated. For this purpose, hollow fiber membranes of different geometry were prepared with different spinnerets via phase inversion spinning and subsequently sintered at different temperatures. The influence of the manufacturing conditions on the LCCF microstructure were analysed by SEM, XRD and TEM. With increasing sintering temperature, the grain size increased from 0.4 µm2 at 1070 °C to 19.5 µm2 at 1245 °C. With bigger grain sizes and lower wall thickness, the oxygen flux shows an increase up to 6.2 ml min−1 cm−2 (at 1000 °C) in a 50% CO2 atmosphere. This finding implies that the grain boundaries act as oxygen diffusion barriers.
Author(s)
Buck, Frederic  
Feldhoff, Armin
Caro, Jürgen
Schiestel, Thomas  orcid-logo
Journal
Separation and purification technology  
DOI
10.1016/j.seppur.2020.118023
Language
English
Fraunhofer-Institut für Grenzflächen- und Bioverfahrenstechnik IGB  
Keyword(s)
  • Ceramic hollow fiber membrane

  • oxygen separation

  • Oxygen transport

  • CO2 resistance

  • Mixed ionic electronic conductor

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