Using diffusion measurements to determine pore-size distributions in porous materials [electronic resource].
- Los Alamos, N.M. : Los Alamos Scientific Laboratory, 1980.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- Pages: 19 : digital, PDF file
- Additional Creators:
- Los Alamos Scientific Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
- Restrictions on Access:
- Free-to-read Unrestricted online access
- A method for determining pore-size distrbutions from diffusion measurements is presented. A Wicke-Kallenbach experiment, for measuring diffusion fluxes within porous materials, was carried out over a significant portion of the transition range between Knudsen flow and bulk diffusion. If the internal porous structure of the material is modeled as myriad nonintersecting cylindrical pores, an equation may be derived for the flux as a function of pressure, in which the flux is a functional of the pore-size distribution. The equation is a Fredholm integral equation of the first kind. This is an application of the general inversion problem, and solution of the equation for the pore-size distribution is possible. It is demonstrated from calculated fluxes using postulated ideal distributions that the method works very well for both unimodal and bimodal distributions. The method is no extraordinarily sensitivire to experimental error. An example of a distribution obtained from a commercial porous catalyst is presented and compared with that obtained by mercury porosimetry.
- Report Numbers:
- E 1.99:la-ur-80-635(rev.)
E 1.99: conf-800610-5
- Published through SciTech Connect.
American Institute of Chemical Engineering conference, Philadelphia, PA, USA, 8 Jun 1980.
Brown, L.F.; Travis, B.J.
- Funding Information:
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