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Influence of LSCF powder proprieties on the manufacturing of asymmetric membranes by tape casting

pubblicazioni - Poster

Influence of LSCF powder proprieties on the manufacturing of asymmetric membranes by tape casting

Cinque polveri di La0.6Sr0.4Fe0.8Co0.2O3-d (LSCF) sono state caratterizzate e la più promettente è stata usata per preparare membrane asimmetriche per separazione di ossigeno tramite tape casting. Gli step di fabbricazione sono stati ottimizzati. La microstruttura delle membrane è stata investigata.

Oxygen separation by Mixed Ionic Electronic Conducting (MIEC) membranes is nowadays regarded as an appealing technology for high purity oxygen generation with low energy consumption and reduced efficiency losses. Perovskite metal oxides are suitable MIEC materials. In particular La0.6Sr0.4Fe0.8Co0.2O3-δ (LSCF) membranes demonstrated high oxygen permeation fluxes and excellent long-term stability upon operating temperatures (800 °C ≤ T ≤ 950 °C). High oxygen permeation rates combined with a good mechanical stability are usually obtained by an asymmetric structure, where a thin dense LSCF layer (≈ 50 μm) is supported on a porous thick LSCF layer (≈ 1 mm). A simple and cost effective approach to fabricate such structures is the tape casting technique.

Tape casting entails several advantages, such as the accurate control of the layer thickness in a wide range and the possibility to deposit large area structures that are essential for the membrane technology scale-up. In this work, asymmetric LSCF membranes have been prepared by sequential tape casting. Commercially available LSCF powders with different morphological and dilatometric properties have been investigated and the slurry composition has been optimized for the most promising powder. Thermal treatment of asymmetric membranes has been optimized. The microstructural properties and the performances of the membranes in terms of permeation have been investigated.

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