丙烯环氧化钼-醇配合物催化剂的研究

Study on Molybdenum-glycol Complex Catalyst for Epoxidation of Propylene

合成了有机钼 -醇配合物 ,并用 IR和 UV - Vis进行了表征 ,研究了对过氧化氢异丙苯 (CHP)环氧化丙烯的催化性能 .研究表明 ,合成的有机钼 -醇化合物具有较强的酸性 ,可分解 CHP,在反应物中加入碱性抑制剂可阻止 CHP的分解 ;不同二醇制备的化合物 ,其酸性和氧化性能各不相同 .由丙二醇制备的钼 -醇化合物的催化环氧化性能较好 .在醇 /钼质量比为 4、水含量低于 10 % (质量分数 )、酸量低于 15 0 mg KOH /m L cat.时 。

Molybdenum glycol complexes are synthesized by reacting ammonium molybdate with alkylene glycol and characterized by IR and UV Vis. Propylene has been epoxidized in the liquid phase with cumene hydroperoxide in the presence of molybdenum glycol complex catalyst. Molybdenum glycol complexes have stronger acidity and can decompose cumene hydroperoxide. Adding basic additives into the reactants may hinder the decomposition of cumene hydroperoxide. Molybdenum glycol catalysts prepared with different glycols have different acidities and catalytic properties. Molybdenum propylene glycol catalyst (alcohol/molybdenum mass ratio is 4) containing lower than 10% of water and lower than 150 mg KOH/ mL cat . of acidity sites, has almost similar catalytic property for the epoxidation of propylene.