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High performance composite CO₂ separation membranes

Lookup NU author(s): Dr Evangelos Papaioannou, Dr Guangru Zhang, Professor Ian Metcalfe

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Abstract

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.

Publication metadata

Author(s): Patrício SG, Papaioannou E, Zhang G, Metcalfe IS, Marques FMB

Publication type: Article

Publication status: Published

Journal: Journal of Membrane Science

Year: 2014

Volume: 471

Pages: 211–218

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

Publisher: Elsevier

URL: http://dx.doi.org/10.1016/j.memsci.2014.08.007

DOI: 10.1016/j.memsci.2014.08.007

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