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Influence of desorption conditions before gas separation studies in nanocomposite MFI–alumina membranes

Alshebani, A., Pera-Titus, M., Yeung, K.L., Miachon, S. and Dalmon, J.-A. 2008. Influence of desorption conditions before gas separation studies in nanocomposite MFI–alumina membranes. Journal of Membrane Science 314 (1-2) , pp. 143-151. 10.1016/j.memsci.2008.01.045

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Abstract

The gas permeation and separation performance of polycrystalline MFI-type zeolite membranes is strongly dependent on the number and type of intercrystalline pores in its structure. Herein we show that the role of such domains is affected by how a membrane is pre-treated before use to remove adsorbed species (e.g. moisture and organics). This ‘pre-treatment’ step appears to be crucial not only to obtain reliable permeation data, but also to improve the membrane separation performance in practical applications. We illustrate this idea by using a collection of tubular nanocomposite MFI–alumina membranes showing different quality for the separation of n-butane/H2 mixtures and submitted to different pre-treatment protocols. The influence of each protocol on the final separation performance of the membranes depends on their quality, namely on the density of intercrystalline defects or non-zeolite pores in their structure. Moreover the quality of the support affects the final membrane performance.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Publisher: Elsevier
ISSN: 0376-7388
Date of Acceptance: 18 January 2008
Last Modified: 13 Oct 2020 11:00
URI: http://orca.cf.ac.uk/id/eprint/135397

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