Keggin型磷钼钒杂多化合物催化氧化乙苯制苯乙酮  

Catalytic oxidation of ethylbenzene to acetophenone over Keggin structure molybdovanadophosphoric heteropoly compounds

作　　者：李贵贤[1] 余华[1] 马重华[1] 滕志君[1] 宋维维[1] 

机构地区：[1]兰州理工大学石油化工学院,甘肃兰州730050

出　　处：《现代化工》2010年第1期41-43,45,共4页Modern Chemical Industry

基　　金：甘肃省教育厅科研基金项目(2005GJ0281)

摘　　要：合成了一系列具有Keggin结构的P-Mo-V杂多化合物(Cpyr)3+xPMo12-xVxO40.nH2O(其中Cpyr=(C16H32C5H4N)+,x=0、1、2、3),并表征了其结构。以磷钼钒杂多化合物为相转移催化剂,用w(H2O2)=50%的双氧水氧化乙苯制备苯乙酮,考察了催化剂的种类、溶剂的类型和反应条件对乙苯氧化反应的影响。在优化条件下,即乙苯25 mmol、催化剂0.2 mmol、w(H2O2)=50%的H2O20.1 mol、在70℃反应8 h、溶剂乙酸25 mL,乙苯的转化率达到80.75%、苯乙酮的选择性达到81.46%。A series of Keggin type heteropoly compounds, （Cpyr）3＋xPMo12- xVxO40（in that Cpyr= （C16H32C5H4N）^＋ , x = 0, 1,2,3 ）, are synthesized and characterized. With 50% of aqueous hydrogen peroxide as oxidant, ethylbenzene can be efficiendy oxidized to acetophenone over the prepared phase-transfer catalysts. The effects of catalyst type, amount of catalyst and H2O2, solvent, and reaction conditions are investigated. Under the following optimal conditions as followed： 25 mmol of ethylbenzene, 0.2 mmol of catalyst and 0.1 mol of H2O2 （ in mass concentration of 50% ）, 70℃ as reaction temperature, and 25 mL of acetic acid as the solvent, a conversion rate of 80.75 % for ethylbenzene can be obtained within 8 hours with a selectivity of 81.46% for acetophenone.

关 键 词：磷钼钒杂多化合物 过氧化氢 催化氧化 苯乙酮 

分 类 号：TQ426.91[化学工程]