Tubular dense perovskite type membranes. Preparation, sealing, and oxygen permeation properties
Tubular dense perovskite type membranes were prepared by isostatic pressing and plastic extrusion. The resulting tubular La{sub 0.6}Sr{sub 0.4}Co{sub 0.2}Fe{sub 0.8}O{sub 3{minus}{delta}} perovskite type membrane prepared by plastic extrusion (designated as PE-LSCF) has a lower density and oxygen permeation flux compared with that prepared by isostatic pressing (designated as IP-LSCF). A ceramic binder developed by the research center provided reliable sealing for the tubular dense membrane at high temperature. The oxygen permeation flux increases with increasing temperature, and the value is about 0.13 cm{sup 3}/cm{sup 2} min (STP) at 1,123 K. The activation energy for oxygen permeation is 168 kJ/mol at the temperature range of 1,073--1,173. X-ray diffraction analysis for the membranes over 110 h of operation indicated that SrSO{sub 4}, CoSO{sub 4}, SrO, Co{sub 2}O{sub 3}, and La{sub 2}O{sub 3} were formed on the surfaces of the tubular membrane, especially for the tubular PE-LSCF membrane, because of interaction with trace SO{sub 2} in the air and the helium and segregation of surface elements.
- Research Organization:
- Nanjing Univ. of Chemical Technology (CN)
- OSTI ID:
- 20005896
- Journal Information:
- Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 12 Vol. 38; ISSN IECRED; ISSN 0888-5885
- Country of Publication:
- United States
- Language:
- English
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