Abstract
p-Xylene and benzene have been adsorbed at room temperature and relative pressure p p 0 ∼ 0.5 on ZSM-5, ZSM-11, and THETA-1 with low Si Al ratios of 15, 15, and 32, respectively. The desorption of these sorbates was then followed by temperature-programmed desorption (t.d.p.). The t.p.d. profiles were analyzed using an on-line microcomputer. Both single-heating rate-variable coverage and variable-heating rate-constant coverage methods of analyses have been used. The former method gave more reasonable activation energies and entropies of desorption as a function of coverage. These parameters have been compared with the corresponding values obtained in Part I for n-hexane and n-octane. Desorption of p-xylene from ZSM-5 and ZSM-11 zeolites of varying Si Al ratio has also been studied. It was observed that as the Si Al ratio increased the amount adsorbed at saturation increased but the activation energy decreased.
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