Review of Experimental Methods for Determining Effective Diffusivities in Catalyst Pellets

摘要

The steady state Wicke-Kallenbach method is preferred for the determination of gas phase diffusivities, but is unsuitable for work in the liquid phase. For the latter transient methods should be used. Stirred tank methods are normally used for multiple pellet work and pulse liquid chromatography may provide a suitable alternative. For single pellets the continuous stirred tank method and the closed chamber Wicke-Kallenbach method are the most promising.