کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
637695 883691 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Systematic investigation on new SrCo1−yNbyO3−δ ceramic membranes with high oxygen semi-permeability
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
Systematic investigation on new SrCo1−yNbyO3−δ ceramic membranes with high oxygen semi-permeability
چکیده انگلیسی

SrCo1−yNbyO3−δ (y = 0.025–0.4) were synthesized for oxygen separation application. The crystal structure, phase stability, oxygen nonstoichiometry, electrical conductivity, and oxygen permeability of the oxides were systematically investigated. Cubic perovskite, with enhanced phase stability at higher Nb concentration, was obtained at y = 0.025–0.2. However, the further increase in niobium concentration led to the formation of impurity phase. The niobium doping concentration also had a significant effect on electrical conductivity and oxygen permeability of the membranes. SrCo0.9Nb0.1O3−δ exhibited the highest electrical conductivity and oxygen permeability among the others. It reached a permeation flux of ∼2.80 × 10−6 mol cm−2 s−1 at 900 °C for a 1.0-mm membrane under an air/helium oxygen gradient. The further investigation demonstrated the oxygen permeation process was mainly rate-limited by the oxygen bulk diffusion process.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Membrane Science - Volume 323, Issue 2, 15 October 2008, Pages 436–443
نویسندگان
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