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Composite CO2 separation membranes: Insights on kinetics and stability

Lookup NU author(s): Dr Evangelos Papaioannou, Dr Brian Ray, Professor Ian Metcalfe



This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).


The electrical performance and CO2 permeation of composite membranes based on Gd-doped ceria skeletonsimpregnated with molten alkaline carbonates are benchmarked against their predictable performance based onambipolar conductivity governed kinetics (best scenario), using customized diagrams. Experiments performed inthe 550–850 °C temperature range showed permeation rates reaching almost 0.6 cm3 min−1 cm−2 at 850 °Cwith 50 mol% CO2 content in the feed side. Endurance tests performed at 650 °C for over 100 h showed a smalldegradation due to microstructural changes. Impedance spectroscopy measurements combined with microstructuralanalysis involving several composite membranes and skeletons after distinct thermal history confirmedthe potential of these techniques to monitor the ceramic skeleton and membrane condition. The diagramsused to map membrane performance highlight in an entirely novel manner several kinetic and experimentalconstraints.

Publication metadata

Author(s): Patrício SG, Papaioannou EI, Ray BM, Metcalfe IS, Marques FMB

Publication type: Article

Publication status: Published

Journal: Journal of Membrane Science

Year: 2017

Volume: 541

Pages: 253-261

Print publication date: 01/11/2017

Online publication date: 08/07/2017

Acceptance date: 06/07/2017

Date deposited: 11/07/2017

ISSN (print): 0376-7388

ISSN (electronic): 1873-3123

Publisher: Elsevier BV


DOI: 10.1016/j.memsci.2017.07.008

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