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Measurement of surface diffusivities in mesoporous Vycor glass membranes using a modified Wicke-Kallenbach cell with variable cell volume

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons86400

Markovic,  A.
Physical and Chemical Foundations of Process Engineering, Max Planck Institute for Dynamics of Complex Technical Systems, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons86477

Seidel-Morgenstern,  A.
Physical and Chemical Foundations of Process Engineering, Max Planck Institute for Dynamics of Complex Technical Systems, Max Planck Society;
Otto-von-Guericke-Universität Magdeburg, External Organizations;

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Citation

Markovic, A., Schlünder, E.-U., & Seidel-Morgenstern, A. (2010). Measurement of surface diffusivities in mesoporous Vycor glass membranes using a modified Wicke-Kallenbach cell with variable cell volume. International Journal of Heat and Mass Transfer, 53(1-3), 384-389. doi:10.1016/j.ijheatmasstransfer.2009.09.018.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0013-900C-A
Abstract
The purpose of this paper is to suggest a new experimental method for the measurement of surface diffusivities in porous membranes and to demonstrate its applicability in a case study. So far only indirect methods are applied. Hereby the flux contributions due to surface diffusion are extracted from the total fluxes by subtracting calculated gas phase contributions. Since gas and adsorbed phases are coupled by adsorption equilibrium, surface diffusivities cannot be extracted from surface diffusion fluxes without knowing sorption isotherms. Thus, the quality of surface diffusivity data then depends on the quality of the adsorption data. Therefore, it might be worthwhile to look for another method, which allows the direct measurement of surface diffusivities without knowing the adsorption isotherm. We propose to use a modified Wicke–Kallenbach cell (WKC) with a variable chamber volume and to run pressure response experiments with one inert gas and the counter-diffusing adsorbable gas, for which one wants to determine the surface diffusivity. Copyright © 2009 Elsevier B.V. All rights reserved. [accessed November 26, 2009]