Abstract
Abstract The disproportionation of propylene and 1-butene over MoO3–Al2O3 and Re2O7–Al2O3 catalysts was carried out in order to investigate the effects of reaction pressure in the range from 1.0 to 130 kg/cm2. The effects of the pressure on the reaction can be identified as two independent of the reaction phase; the catalytic activity increased with the reaction pressure, and the time needed to reach the maximum conversion (Tmax) as well as the time when the conversion falls to half the maximum value (τ1⁄2) decreased with the increase in the reaction pressure. It can be concluded that the catalytic activity by the polymers formed over the catalyst falls off rapidly with the increase in the pressure. In both phases, the disproportionation of olefins over the Re2O7–Al2O3 catalyst exhibits the following features as compared with that over the MoO3–Al2O3 catalyst: (1) a much higher activity at temperatures of 0–140 °C; (2) a much higher selectivity for disproportionation, and (3) a lower apparent activation energy.
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