Composite CO2 separation membranes: Insights on kinetics and stability

被引：21
|
作者：
Patricio, S. G. [1 ]
Papaioannou, E. I. [2 ]
Ray, B. M. [2 ]
Metcalfe, I. S. [2 ]
Marques, F. M. B. [1 ]
机构：
[1] Univ Aveiro, CICECO, Dept Mat & Ceram Engn, P-3810193 Aveiro, Portugal
[2] Newcastle Univ, Sch Chem Eng & Adv Mat, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England
来源：
JOURNAL OF MEMBRANE SCIENCE | 2017年 / 541卷
基金：
英国工程与自然科学研究理事会; 欧洲研究理事会;
关键词：
CO2; permeation; Impedance spectroscopy; Ambipolar conductivity; Membrane endurance; Composite electrolytes; CARBON-DIOXIDE SEPARATION; DUAL-PHASE MEMBRANES; MOLTEN-CARBONATE; HIGH-TEMPERATURE; IMPEDANCE SPECTROSCOPY; DOPED CERIA; ELECTROLYTES; PERFORMANCE; PERMEATION; TRANSPORT;
D O I：
10.1016/j.memsci.2017.07.008
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
The electrical performance and CO2 permeation of composite membranes based on Gd-doped ceria skeletons impregnated with molten alkaline carbonates are benchmarked against their predictable performance based on ambipolar conductivity governed kinetics (best scenario), using customized diagrams. Experiments performed in the 550-850 degrees C temperature range showed permeation rates reaching almost 0.6 cm(3) min(-1) cm(-2) at 850 degrees C with 50 mol% CO2 content in the feed side. Endurance tests performed at 650 degrees C for over 100 h showed a small degradation due to microstructural changes. Impedance spectroscopy measurements combined with microstructural analysis involving several composite membranes and skeletons after distinct thermal history confirmed the potential of these techniques to monitor the ceramic skeleton and membrane condition. The diagrams used to map membrane performance highlight in an entirely novel manner several kinetic and experimental constraints.
引用
收藏
页码：253 / 261
页数：9
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