Lookup NU author(s): Dr Evangelos Papaioannou,
Dr Guangru Zhang,
Professor Ian Metcalfe
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).
The CO2 permeation of composite membranes obtained by impregnation of molten alkaline carbonates into a Gd-doped ceria ceramic skeleton was tested using several gas mixtures with up to 50 vol% CO2 as feed gas and Ar in the membrane permeate side. Experiments performed in the 550-850 °C temperature range showed high permeation rates reaching 0.6 ml.min-1.cm-2 at 850 °C for the higher CO2 content. These values exceed those often reported for similar membranes and conditions. Furthermore, the characterization of the ceramic skeletons and composite membranes by impedance spectroscopy (in air at low temperature) could be used to estimate the temperature where dual oxide and carbonate ionic transport are balanced (around 800 °C). The inherent shift in the CO2 permeation activation energy is shown to match closely this prediction.
Author(s): Patrício SG, Papaioannou E, Zhang G, Metcalfe IS, Marques FMB
Publication type: Article
Publication status: Published
Journal: Journal of Membrane Science
Print publication date: 01/12/2014
Online publication date: 11/08/2014
Acceptance date: 02/08/2014
Date deposited: 25/10/2014
ISSN (print): 0376-7388
ISSN (electronic): 1873-3123
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