固体酸S_2O_8^(2-)/Fe_2O_3-SiO_2催化制备马来酸二己酯  

Synthesis of dihexyl maleate over solid acid S_2O_8^(2-)/Fe_2O_3-SiO_2 catalyst

作　　者：华平[1] 沙兆林[1] 

机构地区：[1]南通工学院化工系,江苏南通226007

出　　处：《应用化工》2002年第6期3-8,共6页Applied Chemical Industry

基　　金：南通市科技局基金资助项目 (A2 0 0 10 2 9)

摘　　要：在铁氧化物中引入硅的氧化物 ,并用S2 O82 -浸渍铁硅复合氧化物 ,制得固体酸催化剂S2 O82 -/Fe2 O3 SiO2 (Ⅰ )。用马来酸酐与正己醇的酯化反应考察了催化剂的活性。通过XRD和TEM分析 ,对催化剂的结构进行了表征。结果表明 ,Ⅰ的最佳制备条件为 :n(Fe)∶n(Si)为 5∶1、70℃陈化 3h ,2 0 0℃焙烧 2h、用 0 2 5mol/L的 (NH4) 2 S2 O8浸渍 3h、在 5 5 0℃下煅烧 6h ;Ⅰ的催化活性比S2 O2 -8/Fe2 O3 和SO2 -4/Fe2 O3 SiO2 更强 ,S2 O2 -8对Fe2 O3 SiO2 的促进作用明显高于SO2 -4;SiO2 的引入提高了催化剂的分散效果 ;有较好的使用重复性 ;它代替硫酸。Introduce silica into iron oxide to form a composite oxide of iron silicon,it is impregenated with persulfate,the solid acid catalyst S 2O 8 2- /Fe 2O 3 SiO 2 (I) is prepared.The catalytic activity of I is studied by the esterification of maleic anhydride and n hexanol.The structure of I is characterized by analysis of XRD and TEM.The results showed that the optimum conditions for preparing I were as below∶molar ratio of iron to silicon is 5∶1,ageing 3 h at 70 ℃,roast 2 h at 200 ℃,impregenating 3 h with 0.25 mol/L(NH 4) 2S 2O 8 and then calcinate 6 h at 550 ℃.The catalytic activity of I was more active than S 2O 8 2- /Fe 2O 3 and SO 2- 4/Fe 2O 3 SiO 2, the promoter action of S 2O 2- 8 was obviously high than SO 2- 4 for Fe 2O 3 SiO 2 .The dispersion effect of catalyst was increased by addition of SiO 2,its reusing properties were good.I can in place of surfuric acid and toluene p sulfonic acide for esterification of malcic anhydride and hexanol,the colorless and transparent product can be obtained.

关 键 词：S2O8^2-/Fe2O3-SiO2 固体酸催化剂 马来酸二己酯 酯化反应 

分 类 号：O643.1[理学—物理化学]