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 |
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Authors: | O V Bragin V L Yakerson T V Vasina S A Isaev L I Lafer V D Nissenbaum |
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Institution: | 1. N. D. Zelinskii Institute of Organic Chemistry, Academy of Sciences of the USSR, Moscow
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Abstract: | 1. |
The H-pentasil- -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.
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A correlation between the activity and number of strong Brønsted and Lewis sites, determined spectrally by adsorption of pyridine, was found for the HTsVM-Al2O3 catalytic system; it was concluded that Brønsted and Lewis sites are required for the reaction of aromatization of ethylene.
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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.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 254–258, February, 1989. |
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