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  Gas permeation through porous glass membranes Part I: Mesoporous glasses – effect of pore diameter and surface properties

Markovic, A., Stoltenberg, D., Enke, D., Schlünder, E.-U., & Seidel-Morgenstern, A. (2009). Gas permeation through porous glass membranes Part I: Mesoporous glasses – effect of pore diameter and surface properties. Journal of Membrane Science, 336(1-2), 17-31. doi:10.1016/j.memsci.2009.02.031.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-9367-4 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-B556-9
Genre: Journal Article

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 Creators:
Markovic, A.1, Author              
Stoltenberg, D.1, 2, Author              
Enke, D.2, Author
Schlünder, E.-U.3, Author
Seidel-Morgenstern, A.1, 4, Author              
Affiliations:
1Physical and Chemical Foundations of Process Engineering, Max Planck Institute for Dynamics of Complex Technical Systems, Max Planck Society, ou_1738150              
2Martin-Luther-Universität Halle-Wittenberg, Institut für Chemie, Halle/Saale, Germany , ou_persistent22              
3Universität Karlsruhe, Germany , ou_persistent22              
4Otto-von-Guericke-Universität Magdeburg, External Organizations, ou_1738156              

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Free keywords: Porous glass membranes; Knudsen diffusion; Viscous flow; Surface diffusion; Gas separation; Surface modification
 Abstract: This paper describes the preparation and the quantitative investigation of gas transport and equilibrium properties of porous glass membranes with pore diameters in a relative narrow range between 2.3 nm ÷ 4.2 nm. The membranes structure and surface were characterized by low temperature nitrogen adsorption, thermogravimetry analysis and inverse gas chromatography. Single gas permeation of He, N2, Ar, CO2 and C3H8 was measured in the temperature range of 293 K - 433 K. To evaluate adsorption affinities of examined gases, volumetric adsorption measurements were applied at three different temperatures (293 K, 323 K and 353 K). The permeability observations made for these membranes revealed that the transport is predominantly governed by Knudsen diffusion and viscous flow for gas phase transport and surface diffusion when an adsorbed phase is involved. Only a selective surface transport can enhance the limited Knudsen selectivity. Aiming to study also the influence of surface properties of the glass membranes on gas permeation and selectivity one membrane with a pore diameter of 2.3 nm was modified with hexamethyldisilazane. The procedure applied led to a hydrophobization and the creation of trimethylsilyl groups, which are able to fix nonpolar molecules to the surface and to provide larger separation factors between polar and nonpolar gases. The permeability of the modified membrane was found to be reduced but Knudsen diffusion was still dominating. In order to reach higher selectivity factors the pore diameter should be further reduced. A more detailed description of a subsequently prepared microporous glass membrane characterized by mass transport in the transition regime between Knudsen and configurational diffusion is presented in a Part II of this paper. Copyright © 2009 Published by Elsevier B.V. [accessed March 17, 2009]

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Language(s): eng - English
 Dates: 2009
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: eDoc: 412650
Other: 20/09
DOI: 10.1016/j.memsci.2009.02.031
 Degree: -

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Title: Journal of Membrane Science
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 336 (1-2) Sequence Number: - Start / End Page: 17 - 31 Identifier: ISSN: 0376-7388
CoNE: https://pure.mpg.de/cone/journals/resource/954925525807