Kinetics of water vapor diffusion in activated alumina
Written by sctunisie no commentsThe transient diffusion of water vapor on activated alumina is analyzed by the Weiz equation. It is found that this one parameter model describes well the sorption kinetic and provides an easy method for calculating the effective diffusion coefficient for the isobaric-isothermal process. The effective diffusion parameter is sufficient to describe the entire kinetic curve, at short and long times. A comparison of the general solution of the diffusion equation with this relation is done. It shows a weak difference between them. From the diffusion coefficients determined at different temperatures an activation energy is calculated which agrees well with reported values, indicating an increase by a factor 2 when the temperature is increased from 39 to 80°C.
M. Baguenne, A. Bellagi
Pages 11-23
