复合纳米固体超强酸SO_4^(2-)/ZrO_2-Al_2O_3-SiO_2的制备及催化合成乙酸戊酯的研究  

Preparation of Nanosized Solid Superacid SO_4^(2-)/ZrO_2-Al_2O_3-SiO_2 and Catalyzed Synthesis of n-Amyl Acetate

作　　者：肖容华 徐景士[2] 

机构地区：[1]广东东莞万德集团研究所,广东东莞523121 [2]江西师范大学化学化工学院,江西南昌330027

出　　处：《广东化工》2009年第11期55-58,共4页Guangdong Chemical Industry

摘　　要：制备了纳米级复合固体超强酸SO42-/ZrO2-Al2O3-SiO2催化剂,研究了其对乙酸和正戊醇酯化反应的催化作用,确定了反应的最佳条件:复合氧化物中n(Zr):n(Al):n(Si)=1:4:1,浸渍液(NH4)2SO4浓度为2mol/L,600℃焙烧3h,n(酸):n(醇)=1:1.4,催化剂用量为反应物料总质量的4.4%,在130℃下反应6h,乙酸戊酯的收率为89.13%。并通过XRD、IR、流动Hammett指示剂法以及TEM法对催化剂进行了表征,该催化剂的酸强度为-12.70<Ho≤-11.99。The composite nanometer-sized solid superacid SO4^2-/ZrO2-Al2O3-SiO2 was prepared by coprecipitation method and its esterification activity for n-pentanol with acetic acid was examined. The influence factors of the reaction were discussed, the results showed that the appropriate conditions should be： the molar ratio of Zr to Al and Si was 1 ： 4 ： 1 ; impregnant concentration of （NH4）2SO4 was 2 mol/L; calcining at 600 ℃ for 3 b; molar ratio of acetic acid to n-pentanol was 1 ： 1.4, the quantity of catalyst equal to 4.4 % of feed stocks;reaction time 6 h; reation temperature 130 ℃. The yield of n-amyl acetate was 89.13 %. The structure of catalyst was studied by XRD, IR, Hammett indicators and TEM methods. The catalytic activity and strength of acid （-12.70〈Ho≤-11.99） was measured.

关 键 词：纳米复合固体超强酸 SO42-/ZrO2-Al2O3-SiO2 催化 酯化 

分 类 号：TQ414[化学工程] TQ114.261