含铈固体超强酸SO_4^(2-)/SnO_2-CeO_2-kaolin催化合成异丁酸异丁酯  

Synthesis of Isobutyl Isobutyrate with Solid Superacid SO_4^(2-)/SnO_2-CeO_2-kaolin as Catalyst

作　　者：周慧[1] 张霞[2] 何建英[1] 陈丹云[1] 

机构地区：[1]河南大学化学化工学院精细化学与工程研究所,河南开封475004 [2]郑州轻工业学院继续教育学院,河南郑州450002

出　　处：《稀土》2010年第4期50-53,共4页Chinese Rare Earths

基　　金：河南省科技厅2009年科技发展计划项目(092102210171);河南省教育厅自然科学研究计划项目(2008A150002)

摘　　要：以质量比为1:9:20的硝酸铈铵、高岭土和SnCl4.5H2O制备了含铈固体超强酸催化剂SO42-/SnO2-CeO2-kaolin,制备条件为促进剂H2SO4浓度2.0mol/L,浸渍12h,350℃焙烧3h,并采用Hammett指示剂法和XRD对其进行了酸强度和表面性能表征。适宜反应条件是催化剂用量为反应物总质量的2.5%,醇酸摩尔比1.4、反应时间100min,甲苯10mL,酯收率94.5%,重复使用6次酯收率仍高于80%。Isobutyl isobutyrate was synthesized from isobutyric acid and isobutyl alcohol with solid superacid catalyst SO42-/SnO2-CeO2-kaolin.The catalyst was prepared under the conditions of mass ratio of ammonium ceric nitrate to kaolin to SnCl4·5H2O 1：9：20,concentration of sulfuric acid 2.0mol/L,impregnation time 12h,and calcination at 350℃ for 3h.The catalyst was characterized by Hammett indicator method and XRD.As using synthesis of isobutyl isobutyrate,the optimal conditions were：mass fraction of catalyst in all of reaction system 2.5%,mole ratio of isobutyl alcohol to isobutyric acid 1.4,reaction time 100min and toluene 10mL,the yield was 94.5%.The catalyst also has excellent stability.When it was reused for six times,the yield could be greater than 80%.The catalyst takes advantages of low cost,highly active,non-polluting and reusable.

关 键 词：含铈固体超强酸 异丁酸异丁酯 催化 合成 

分 类 号：O643.3[理学—物理化学]