W-SBA-15催化环氧化苯乙烯合成环氧苯乙烷

实验以Na2WO4为钨源直接合成W-SBA-15介孔分子筛,并以XRD、BET对W-SBA-15的结构进行了分析。以质量分数30%的H2O2为氧化剂,丙酮为溶剂,对介孔分子筛W-SBA-15催化环氧化苯乙烯反应进行了研究。其较佳工艺条件为:反应温度70℃,反应时间8 h,催化剂用量为原料的10.0%(质量分数),n(苯乙烯):n(丙酮):n(H2O2)=1∶2∶2,苯乙烯的转化率可达34.25%,环氧苯乙烷的选择性为36.54%,环氧苯乙烷的收率为12.51%(质量分数)。

W-SBA-15 CATALYTIC EPOXIDATION OF STYRENE TO STYRENE OXIDE

Tungsten-containing mesoporous molecular sieves W-SBA-15 were synthesized under conventional hydrothermal conditions in strong acidic solution using Na2WO4 as tungsten source.The molecular sieves were characterized by XRD,BET.The results showed that with the tungsten loaded on SBA-15,it possess characteristic peaks of mesoporous molecular sieve.To 30%(concentration) H2O2 as oxidant and acetone as the solvent,obtained W-SBA-15 catalytic epoxidation of Styrene to Styrene oxide preferable conditions: the reaction temperature is 70 ℃,the reaction time is 8 h,the amount of catalyst for the raw material is 10.0%(concentration),n(Styrene)∶n(Acetone)∶n(Hydrogen peroxide)= 1∶2∶2,the fractional conversion of Styrene is up to 34.25%(concentration),the selectivity of Styrene oxide is up to 36.54%(concentration),the yield of Styrene oxide is up to 12.51%(concentration).