Structure and oxygen permeability of Ag-doped SrCo0.8Fe0.2O3-δ oxides

✍ Scribed by Liang Tan; Li Yang; Xuehong Gu; Wanqin Jin; Lixiong Zhang; Nanping Xu

• Publisher: American Institute of Chemical Engineers
• Year: 2004
• Tongue: English
• Weight: 125 KB
• Volume: 50
• Category: Article
• ISSN: 0001-1541
• DOI: 10.1002/aic.10064

✦ Synopsis

Abstract

The powders of SrCo~0.8~Fe~0.2~O~3‐δ~ (SCF) and SCF doped with a different amount of Ag cation are synthesized by a solid‐state reaction method and the corresponding membranes are prepared. XRD results show that the doped Ag promotes the formation of a perovskite structure. The dissolution of Ag~2~O into the SCF matrix results in a decreasing lattice constant with the increasing Ag content. The doping of Ag can increase the surface exchange rate and decrease the activation energy of the SCF membrane. The oxygen permeability of the Ag‐doped SCF membrane is mainly influenced by both the reduction of the oxygen vacancy concentration and the improvement of the surface exchange, which depend on the content of the doped Ag and the operation temperature. The highest oxygen permeation flux is obtained when the mole ratio of Ag to SCF is 5%. © 2004 American Institute of Chemical Engineers AIChE J, 50: 701–707, 2004