Composite CO2 separation membranes: Insights on kinetics and stability
authors Patricio, SG; Papaioannou, EI; Ray, BM; Metcalfe, IS; Marques, FMB
nationality International
journal JOURNAL OF MEMBRANE SCIENCE
author keywords CO2 permeation; Impedance spectroscopy; Ambipolar conductivity; Membrane endurance; Composite electrolytes
keywords CARBON-DIOXIDE SEPARATION; DUAL-PHASE MEMBRANES; MOLTEN-CARBONATE; HIGH-TEMPERATURE; IMPEDANCE SPECTROSCOPY; DOPED CERIA; ELECTROLYTES; PERFORMANCE; PERMEATION; TRANSPORT
abstract 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.
publisher ELSEVIER SCIENCE BV
issn 0376-7388
isbn 1873-3123
year published 2017
volume 541
beginning page 253
ending page 261
digital object identifier (doi) 10.1016/j.memsci.2017.07.008
web of science category Engineering, Chemical; Polymer Science
subject category Engineering; Polymer Science
unique article identifier WOS:000408371400026
  ciceco authors
  impact metrics
times cited (wos core): 1
journal impact factor (jcr 2016): 6.035
5 year journal impact factor (jcr 2016): 5.983
category normalized journal impact factor percentile (jcr 2016): 95.187
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