کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4989089 1455976 2017 38 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Surface exchange model for ITM membrane in transient stage
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
Surface exchange model for ITM membrane in transient stage
چکیده انگلیسی
Mixed Ionic and Electronic Conductors (MIECs) are promising membrane materials for oxygen separation from air at high temperature. The transient stage is critical due to the stress induced by the chemical strain, combined with the oxygen activity field through the membrane. In the literature, permeation models are able to predict the oxygen flux in steady state or to identify the slowest mechanism. In this paper, the proposed model aims to predict the oxygen activity fields through the membrane both in transient stage and steady state. A macroscopic approach is proposed, the balance of a temporary species is introduced to take into account separately the dissociative adsorption, associative desorption and interface reaction between surface and bulk. New densities of probability are proposed to model dissociative adsorption and associative desorption in order to take into account the difference between “classical” catalysis and the MIECs case. This model is implementing in the finite element software COMSOL Multiphysics© thanks to the combination of the modules “coefficient form PDE” and “coefficient form boundary PDE”. The results of the model are in good agreement with steady state and transient stage experimental data. The different kinetics of oxygen release and oxygen intake are well reproduced.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Membrane Science - Volume 523, 1 February 2017, Pages 614-622
نویسندگان
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