Abstract
In case of nonisobaric diffusion, the total flux of a gas through a porous solid is expressed in terms of the summation of diffusion and viscous flow terms. The diffusion flux is generally considered to be inversely proportional to the series combination of molecular and Knudsen resistances. On the other hand, viscous flow is expressed by the Darcy equation. In some applications with porous catalysts, diffusion with a pressure gradient is of interest. Single-Pellet moment technique is one of the fastest and most dependable methods for the measurement of intraparticle rate parameters. The method was used to determine effective diffusion coefficients, adsorption equilibrium, and the rate parameters in porous catalysts. In this work, a method is introduced for the study of relative significance of diffusion and viscous flow in porous catalysts using the single-pellet moment approach. The method allows the measurement of Darcy coefficient together with effective diffusion coefficient in a porous solid.
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