Tantalum stabilized SrCoO3−δ perovskite membrane for oxygen separation

✍ Scribed by Xinzhi Chen; Liu Huang; Yanying Wei; Haihui Wang

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 784 KB
• Volume: 368
• Category: Article
• ISSN: 0376-7388
• DOI: 10.1016/j.memsci.2010.11.040

✦ Synopsis

The mixed ion and electron conducting oxides of SrCo 1-y Ta y O 3-ı (0 ≤ y ≤ 0.3) powders were prepared by solid state reaction. By doping 10 mol% of tantalum on the B-site of SrCoO 3 , the cubic perovskite structure of the SrCoO 3 is stable and a high oxygen permeation flux is achieved. The phase structure of the perovskite-type oxide of SrCo 0.9 Ta 0.1 O 3-ı was characterized by X-ray diffraction (XRD) and oxygen temperature-programmed desorption (O 2 -TPD) revealing that SrCo 0.9 Ta 0.1 O 3-ı exhibits a good phase structure stability and reversibility in air. The oxygen permeation is predominated by oxygen ion bulk diffusion at the temperature ≥ 900 • C. During the long-term operation, the SrCo 0.9 Ta 0.1 O 3-ı membrane is operated at 900 • C for more than 520 h with a steady oxygen permeation flux of around 1.36 × 10 -6 mol/s cm 2 with a membrane thickness of 0.65 mm under He/air gradient.