TS-1分子筛催化H_2 O_2环氧化苯乙烯制环氧苯乙烷

Preparation of Styrene Oxide by Epoxidation of Styrene with H_2O_2 on TS-1 Molecular Sieve Catalyst

以 TS-1分子筛为催化剂、H_2O_2为氧化剂、尿素为助剂,进行了苯乙烯环氧化反应制环氧苯乙烷的实验。考察了 n(尿素):n(H_2O_2)、n(苯乙烯):n(H_2O_2)、催化剂用量、溶剂丙酮用量和反应温度对苯乙烯环氧化反应的影响;又考察了水热改性、硅烷化改性、有机碱改性3种改性方法制备的 TS-1催化剂的催化性能。以正丁胺改性的TS-1催化剂的催化性能最佳,苯乙烯环氧化反应的最佳条件:25 mmol苯乙烯,n(尿素):n(H_2O_2)=0.50,n(苯乙烯):n(H_2O_2)苯=3.0,0.15 mol 正丁胺改性的TS-1分子筛0.10 g,丙酮10 mL,反应温度60℃,反应时间10 h。在此条件下,苯乙烯的转化率为28.92%,环氧苯乙烷的选择性为77.59%,H_2O_2的利用率为96.98%。

Styrene epoxidation to styrene oxide with H2O2 as oxidizing agent and urea as promoter on TS- 1 molecular sieve catalyst was studied. Effects of n （urea） ： n （ H2O2 ）, n （styrene） ： n （ H2O2 ）, catalyst dosage, solvent acetone dosage and reaction temperature on styrene epoxidation were investigated. TS-1 molecular sieve was modified by three different types of treatments, namely hydrothermal treatment, silylation treatment and organic base treatment. The activities of the modified catalysts were evaluated in styrene epoxodation. Under optimal reaction conditions： 25 mmol styrene, n （urea） ： n （ H2O2 ） 0.50, n （styrene） ： n （ H2O2 ） 3.0, 0.10 g TS-1 molecular sieve modified by 0.15 mol butylamine, 10 mL acetone, reaction temperature 60 ℃ and reaction time 10 h, conversion of styrene is 28.92%, selectivity to styrene oxide is 77.59%, and consumption rate of H2O2 is 96.98%.