Abstract
The influence of the platinum dispersion and of the metal particle size distribution on the catalytic activity in the ethane aromatization over Pt/H-ZSM-5 zeolites was investigated at 823 K in a plug flow reactor. Comparatively high platinum dispersion and low average particle size caused by impregnation of the zeolite with ethanolic H 2PtCl 6 solution lead to a close vicinity of metal and acid sites which is accompanied by an increased electrophilicity of the metal. Such a catalyst posesses a higher deactivation rate than those with more bulky platinum. The rapid deactivation is effected by a higher stability of the chemisorption complex metal-ethylene and by favouring of consecutive reactions of olefinic intermediates towards coke information.
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