A. Micke et al., A NONEQUILIBRIUM SURFACE-BARRIER FOR SORPTION KINETICS OF P-ETHYLTOLUENE ON ZSM-5 MOLECULAR-SIEVES, Journal of physical chemistry, 98(3), 1994, pp. 924-929
Adsorption equilibrium and kinetic data were measured for the system p
-ethyltoluene/Na,H-ZSM-5 zeolite at 343 K. The equilibrium data can be
described by the superposition of two Langmuir isotherms. The kinetic
data follow a complex mechanism of Fickian diffusion superimposed on
the penetration of a surface barrier. The evaluation of the model para
meters were carried out by simulation of sorption uptake curves includ
ing interactions of the system with both the apparatus and the intrins
ic sorption kinetics. The dependence of fitted model parameters with r
espect to loading and pressure, respectively, is consistent with mecha
nistic understanding of the mobility within the crystal interface laye
r and in the crystal bulk.