1998•Journal of Molecular Catalysis(China)Requires access
Effect of Reaction Condition on Propylene Epoxidation Catalyzed by Titanium Silicalite
Gang Li
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Abstract
Propylene epoxidation catalyzed by TS 1 synthesized with TPABr (Tetrapropyl ammonium bromide) as template has been investigated systematically. Effect of reaction parameters such as temperature, propylene pressure, time, catalyst amount etc. were discussed and the optimum reaction condition was found. The pressure of propylene has no effect on propylene epoxidation, but the temperature has a significant effect. As the temperature rises, the H 2O 2 conversion increase and PO selectivity decreases proporcionally. H 2O 2 conversion decreases slowly if the same catalyst is used many times without regeneration, but product distribution changes little. Water at low concentration does not influence the reaction, but if water is used instead of methanol as solvent, the reaction rate decreases remarkablly and a large amount of glycol forms. TS 1 shows no activity if TBHP (Tert butyl hydroperoxide) is used as the oxidant instead of H 2O 2.