Abstract: Bi-Si mesoporous molecular zeolites(Bi-Si) was synthesized by the hydrothermal method with ethyl silicate （TEOS）as silica source, Bi(NO₃)₃·5H₂O as Bi source, and cetyltrimethylammonium bromide（CTAB）as template. Bi-Si catalyst had high ordering structures and high reaction activity in oxidation of styrene with hydrogen peroxide to benzaldehyde. The effects of solvents, reaction time, reaction temperature, oxidant concentration and Bi-Si concentration on the oxidation of styrene to benzaldehyde were studied systematically. It was found that in the following reaction conditions: catalyst 0.075 g, styrene 1.5 ml, methanol 25 ml，H₂O₂(30%) 4.5 ml，T=80 ℃，t=2 h，the conversion of styrene was 43.1%, the selectivity to benzaldehyde was 73.5%,the yield of benzaldehyde reached 31.7%.The possible reaction mechanism could be that one styrene molecule reacted with two H₂O₂ molecules on two joined catalytically active sites.

摘要： 以十六烷基三甲基溴化铵为模板剂，正硅酸乙酯为硅源，硝酸铋为铋源，在弱碱性的条件下用水热法合成了Bi-Si中孔分子筛，该分子筛在苯乙烯催化氧化制苯甲醛的反应中具有很好的催化活性.通过改变溶剂的种类及用量、反应时间、反应温度、双氧水浓度、催化剂用量，获得了较佳反应条件，结果表明：在以25 ml甲醇为溶剂，以4.5 ml H₂O₂（30％）为氧化剂，苯乙烯用量1.5 ml，催化剂用量0.075 g，80 ℃反应2 h的条件下，苯乙烯转化率43.1％，苯甲醛选择性73.5％，苯甲醛产率达到31.7％，同时对可能的苯乙烯氧化反应机理进行了推测.