Abstract
A new type of isobaric diffusion cell for measuring the countercurrent gas diffusion in porous catalyst pellets at atmospheric pressure is proposed. To determine the diffusion fluxes, the rate of change of gas volume in one part of the cell is measured, which follows from Graham's law; this change corresponds to the rise of a soap bubble film in a calibrated burette. To obtain the information needed for evaluating the parameters of equations describing diffusion transport in a porous medium the use of several pairs of gases is proposed. The method of evaluating transport parameters from diffusion measurements of this type is demonstrated for the mean transport-pore model.
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