Temperature-programmed desorption of p-xylene from ZSM-5, ZSM-11 and Theta-1

Abstract

The temperature-programmed desorption of p-xylene from three high-silica-type zeolites, ZSM-5, ZSM-11 and Theta-1, in their mixed H⁺/Na⁺ forms has been determined. Using two recently developed analytical procedures the activation energies and entropies of desorption as a function of coverage have been obtained. The saturation capacities of these three samples for p-xylene have been measured. The saturation capacities and desorption energies have also been determined in ZSM-5 and ZSM-11 samples with varying Si/Al ratios.