纳米固体超强酸SO_4^(2-)/CoFe_2O_4催化合成棕榈酸异辛酯的研究  

Study on catalytic synthesis of iso-octyl palmitate with nanosized solid superacid SO_4^(2-)/CoFe_2O_4

作　　者：王小华[1] 邓斌[1,2] 张晓军[2] 章爱华[3] 

机构地区：[1]湘南学院化学与生命科学系,湖南郴州423000 [2]中国科技大学合肥微尺度物质科学国家实验室,安徽合肥230026 [3]吉首大学化学化工学院,湖南吉首416000

出　　处：《化学工业与工程技术》2009年第3期6-9,共4页Journal of Chemical Industry & Engineering

基　　金：湖南省自然科学基金资助项目(07JJ3017);湖南省教育厅优秀青年科研基金项目(06B089)

摘　　要：利用硝酸铁和硝酸钴为原料制备了纳米固体超强酸SO24-/CoFe2O4催化剂。透射电镜(TEM)测量结果表明,自制催化剂颗粒粒径在20~50 nm。实验探讨了硫酸铵浸渍浓度、催化剂焙烧温度、焙烧时间对催化剂催化活性的影响;并以纳米固体超强酸SO24-/CoFe2O4为催化剂,研究了棕榈酸与异辛醇合成棕榈酸异辛酯过程中影响酯化率的主要因素。实验确定的最优合成条件是:醇酸物质的量比2.0∶1,催化剂质量分数(占反应物总质量的分数)0.50%,反应时间3.0 h,并添加了带水剂,在此条件下反应的酯化率可达97.4%。Nanosized solid superacid SO4^2-/CoFe2O4 is prepared with Fe（NO3 ）3 and Co（NO3）2 as materials. The measure result of TEM indicates that self-synthetical catalyst particle size is approximately 20-50 nm. Effects of （NH4）2SO4 concentration, calcination temperature and calcination time on catalytic activity of nanosized solid superacid are studied. The iso-octyl palmitate is synthesized with palmitic acid and iso-octanol by nanosized solid superacid SO4^2-/CoFe2O4 catalyst. The main influential factors of reaction are investigated. The optimal reaction conditions are obtained as follows： the molar ratio of iso-octanol to palmitic acid is 2.0 ： 1, the dosage of catalyst is 0.5% （based on total mass of reactants）, reaction time is 3.0 h and water- carrying reagent is added. Under these conditions, the yield of iso-octyl palmitate can reach 97.4%.

关 键 词：纳米固体超强酸 SO24-/CoFe2O4 催化合成 棕榈酸异辛酯 

分 类 号：O643.36[理学—物理化学]