Ce-SO_4^(2-)/Al_2O_3催化合成乙酸正丁酯的研究  

PREPARATION OF Ce-SO_4^(2-)/Al_2O_3 AND CATALYTIC PERFORMANCE IN ESTERIFICATION OF n-BUTYL ACETATE

作　　者：田志茗[1] 项晓宇[1] 

机构地区：[1]齐齐哈尔大学化学化工学院,黑龙江齐齐哈尔161006

出　　处：《精细石油化工》2016年第2期11-14,共4页Speciality Petrochemicals

基　　金：齐齐哈尔市工业攻关项目(GYGG-201308)

摘　　要：以拟薄水铝石在500℃焙烧制取的γ-Al_2O_3为载体,利用Ce(SO_4)_2-H_2SO_4溶液浸渍法用对γ-Al_2O_3改性,制备Ce-SO_2-4/Al_2O_3固体催化剂。通过X射线衍射(XRD)、红外光谱(IR)、扫描电镜(SEM)、N_2吸附-脱附等分析方法对催化剂进行了表征。结果表明活性组分的负载对载体Al_2O_3的结构产生了较大的影响,由原来的片状结构变为粒状结构,BET表面积由原来314.3m^2/g增大到346.3m^2/g。颗粒堆积后产生介孔范围的孔道,平均孔径约为5.29nm。将Ce-SO_4^(_2)/Al_2O_3催化剂应用于催化合成乙酸正丁酯具有良好的催化活性,在n(冰乙酸)∶n(正丁醇)=1∶1.0、m(催化剂)∶m(冰乙酸)=0.05∶1、反应3h条件下,酯化率可达93.42%。γ-Al2O3 used as carrier was obtained by calcination of pseudo boehmite at 500 ℃.The CeSO4^（2-）/Al2O3 solid catalysts were prepared by impregnation method in Ce（SO4）2-H2SO4 solution.Characterization was done by X-ray diffraction（XRD）,IR spectroscopic analysis,nitrogen adsorption techniques and scanning electron microscopy（SEM）.The results show that active component of load has great influence on the structure of Al2O3 carrier.γ-Al2O3 SEM analysis exhibits flake structure with BET surface area of 314.3 m^2/g.The Ce-SO4^（2-）/Al2O3 show spherical type particles with BET surface area of 346.3m^2/g.The average pore diameter was 5.29 nm because of aggregated particles of Ce-SO4^（2-）/Al2O3.The catalysts show best catalytic activity in synthesis of n-butyl acetate.The optimum conditions of the esterification by orthogonal experiments were studied as that the molar of acetic acid to n-butano was 1∶1.0,the amount of catalyst was 0.375 g and reaction time was 3h.The conversion of n-butyl acetate could reach 93.42% under the optimum conditions.

关 键 词：拟薄水铝石 活性Al2O3 硫酸高铈 催化 酯化反应 

分 类 号：TQ225.241[化学工程—有机化工]