Abstract
A dynamic model based on BaCe0.9Y0.1O3−δ (BCY10) perovskite membrane for steam permeation process is presented here to essentially investigate the internal mechanism. The transient concentration distribution and flux of the charged species and the electric potential distribution within the membrane on the steam permeation process are analyzed in detail via simulation based on this model. The results indicate that the flux of steam can be improved via elevating operating temperatures, enlarging the difference of the partial steam pressure between two sides of the membrane, increasing the membrane density, and reducing the membrane thickness. Moreover, it was found that the polarization electric potential between both sides of the membrane occurs during the steam permeation process, especially at the steady state of the steam permeation process. The polarization electric potential reaches the maximum value at about 1050 K in this membrane. The evolution of electric potential can explain the influence of the above-mentioned factors on the steam permeation process. This study advances the mechanism of steam permeation through perovskite membrane, which provides a new strategy for the fundamental investigation of related species permeation (oxygen, carbon dioxide, hydrogen, etc.) on inorganic membranes via transient modeling.
Highlights
IntroductionPerovskite oxides with special physical characteristic are widely applied in membrane separation (oxygen/hydrogen/carbon dioxide separation membranes) [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21], fuel cells [22,23,24], and other environment-related application areas [25,26,27,28,29,30,31,32,33,34,35,36,37,38]
Among various gas separation processes, it is very important to study the steam permeation process as steam plays a critical role in many devices, solid oxide fuel cells (SOFCs), in which the steam permeation process can increase the flux of proton in the electrolytes
We aimed to reveal the mechanism of the steam permeation process on inorganic perovskite oxide membranes via building a dynamic model to simulate the whole process
Summary
Perovskite oxides with special physical characteristic are widely applied in membrane separation (oxygen/hydrogen/carbon dioxide separation membranes) [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21], fuel cells [22,23,24], and other environment-related application areas [25,26,27,28,29,30,31,32,33,34,35,36,37,38]. Many studies have focused on the mechanism of perovskite oxide membrane for high-temperature gas separation in practical experiments; the research on the simulation of the gas separation process is still limited and inadequate. Since the investigation on the gas separation process would give rise to the insightful understanding of the internal mechanism through the transient data capture [39,40,41], it is urgent to develop and build rational computational simulation model of inorganic membrane materials towards gas separation process. It is worth noting that the charged species permeation during the steam permeation process is closely correlated to the properties of membrane and the operation conditions. It is necessary and significant to study the relationships between the steam permeation and the above conditions in order to design more efficient membrane reactors
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