Study of the catalytic properties of pentasil-containing composites in transformations of hydrocarbons. 1. Oligomerization and aromatization of ethylene on the pentasil-aluminum oxide system

1. The H-pentasil-γ-Al2O3 catalytic system exhibits high activity and selectivity in the 350–500°C temperature range in the reaction of aromatization of ethylene, A sharp increase in the activity is observed when HTsVM (0.5–10%) is incorporated in Al2O3, and a moderate increase is observed on incorporation of Al2O3 in HTsVM. 2. A correlation between the activity and number of strong Bronsted and Lewis sites, determined spectrally by adsorption of pyridine, was found for the HTsVM-Al2O3 catalytic system; it was concluded that Bronsted and Lewis sites are required for the reaction of aromatization of ethylene. 3. The absence of additivity in the hydrophilic properties in comparison to the properties of the pure components was found in the HTsVM-Al2O3 system; it was hypothesized that this effect reflects a change in the organophilic properties, which has a positive effect on the activity and selectivity of the process.