2005•Journal of Molecular Catalysis(China)Requires access
The Effect of Solvent and Acid-base on 1-Butylene Epoxidation Catalyzed by Titanium Silicalite
Shuqi Ma
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Abstract
The solvent effect of 1-butylene epoxidation was investigated over titanium silicate TS-1 using hydrogen peroxide as oxidant. Epoxidation activity is better in protic solvents than that in nonprotic solvents, and the conversion of H_2O_2 is the highest using methanol as solvent. Basic additive ammonia and acid additive hydrochloric acid were added respectively to change the pH value of the reaction medium. It has been shown that the selectivity of 1,2-epoxybutane(BO) was improved as the pH value increased, but excessive ammonia additive inhibited the activity of TS-1 catalyst, the conversion and the utilization of H_2O_2 decreased sharply. Compared with propylene epoxidation catalyzed by titanium silicate TS-1, the effect of acid addition on 1-butylene epoxidation is neglectable, the selectivity of BO has not obviously decreased as the pH value fell.