Experimental and modeling study on tubular dense membranes for oxygen permeation
Tubular La{sub 0.6}Sr{sub 0.4}Co{sub 0.2}Fe{sub 0.8}O{sub 3{minus}{delta}} perovskite-type membranes were prepared by isostatic pressing. A mathematical model was developed to simulate the performance of the tubular perovskite-type dense membranes for oxygen permeation. The experimental oxygen permeation fluxes of 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 increased with decreasing downstream oxygen partial pressure and increasing helium flow rate, which coincided with the results of the oxygen permeation modeling study. Parametric study indicated that air should be supplied sufficiently during the oxygen permeation operation. Modeling oxygen permeation fluxes as a function of the tubular membrane length and tubular membrane thickness are discussed in detail. The oxygen flux slightly decreases after long-term operation over 110 h. EDS and XRD analysis indicated that SrSO{sub 4}, CoSO{sub 4}, SrO, Co{sub 2}O{sub 3} were formed on the surfaces of the tubular membrane due to the interaction with trace SO{sub 2} in the air and the helium, and segregation of surface elements. The oxygen permeation of tubular La{sub 0.6}Sr{sub 0.4}Co{sub 0.2}Fe{sub 0.8}O{sub 3{minus}{delta}} membrane was stable after SO{sub 2} in the air and the helium has been removed.
- Research Organization:
- Nanjing Univ. of Chemical Technology (CN)
- OSTI ID:
- 20006394
- Journal Information:
- AIChE Journal (American Institute of Chemical Engineers), Journal Name: AIChE Journal (American Institute of Chemical Engineers) Journal Issue: 12 Vol. 45; ISSN AICEAC; ISSN 0001-1541
- Country of Publication:
- United States
- Language:
- English
Similar Records
Comparison of oxygen permeability and stability of perovskite type La{sub 0.2}A{sub 0.8}Co{sub 0.2}Fe{sub 0.8}O{sub 3{minus}{delta}} (A = Sr, Ba, Ca) membranes
Perovskite-related ZrO{sub 2}-doped SrCo{sub 0.4}Fe{sub 0.6}O{sub 3{minus}{delta}} membrane for oxygen permeation