کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
639201 1456188 2006 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Oxygen permeability and structural stability of BaCe0.15Fe0.85O3−δ membranes
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
Oxygen permeability and structural stability of BaCe0.15Fe0.85O3−δ membranes
چکیده انگلیسی

Cobalt-free BaCexFe1−xO3−δ (x = 0.15–0.85) membranes have both high oxygen permeation flux and high structure stability even in reducing atmosphere at high temperature. The oxygen flux of BaCe0.15Fe0.85O3−δ (BCF1585) membrane reached at 0.5 ml/min cm2 at 900 °C with a thickness of 1.4 mm. Oxygen permeation results showed that oxygen permeation controlling step mainly was oxygen ion diffusion in the membrane bulk if the membrane thicker than 1.0 mm, and mainly was surface oxygen exchange if the membrane thinner than 0.78 mm. Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) porous layer coated on the membrane surfaces could effectively accelerate the surface oxygen exchange rate, thus greatly improve the oxygen permeability of the membrane. In some cases, the oxygen permeation flux of the membrane coated with BSCF was even two times higher than that of the membrane without coating. Perovskite structure of BCF1585 was still maintained at 950 °C even after it was exposed to 5% H2 + Ar mixture gas for 1 h.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Membrane Science - Volume 283, Issues 1–2, 20 October 2006, Pages 38–44
نویسندگان
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