Abstract
The catalytic performance and availability of heleropoly compounds in vapor phase isomerizalion of elhylbenzene to xylene have been studied. 12-molybdophosphoric acid and its salts of four first row transition metals (Cr. Fe, Co and Ni) were chosen as heteropoly compounds, and they were supported together with platinum over Y-zeolite. The experiments were carried out at 400‡C, 18 kg/cm2 of H2 pressure, 4.6 of H2/ethylbenzene mole ratio and 1.5 gr-feed/hr gr-cal of LWHSV (Liquid Weight Hourly Space Velocity). As the results of experiments, heleropoly acid enhances the activity and selectivity of isomerization and the activity of isomerization is strongly affected by the method of catalyst preparation. In case of 12-molybdophosphates, their acidities vary with the kind of countercalions and it seems that the acidity is closely related to the electro negativity of the corresponding countercation. The pretrealment with hydrogen shows an echanced activity and selectivity.
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