ZrO_2-TiO_2复合催化剂的制备及其催化合成柠檬酸三丁酯  

Preparation of ZrO_2-TiO_2 Composite Catalyst and Its Function for Synthesis of Tributyl Citrate

作　　者：于清跃[1,2] 王监宗 于荟 武文良[3] 朱新宝[1] YU Qing-yue WANG Jian-zong YU Hui WU Wen-liang ZHU Xin-bao(College of Chemical Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, China Applied Chemical Engineering Centre of Jiangsu Province, Nanjing Polytechnic Institute, Nanjing, Jiangsu 210048, China College of Chemical Engineering, Nanjing Technology University, Nanjing, Jiangsu 210009, China)

机构地区：[1]南京林业大学化工学院,江苏南京210037 [2]南京科技职业学院江苏省应用化工工程中心,江苏南京2100048 [3]南京工业大学化工学院,江苏南京210009

出　　处：《过程工程学报》2016年第5期876-881,共6页The Chinese Journal of Process Engineering

基　　金：江苏省骨干教师与校长境外研修基金资助项目(编号:2013-2014);江苏省高校品牌专业基金资助项目(编号:PPZY);江苏省高校优势学科建设工程基金资助项目(编号:PAPD)

摘　　要：采用共沉淀法制备复合催化剂Zr O2-Ti O2,对其晶体形态、形貌、比表面积、孔性质、酸性质进行了表征,考察了其对柠檬酸与正丁醇酯化反应的催化性能.结果表明,复合物中Zr O2含量为25%(ω)时,Zr O2-Ti O2呈无定型形态,比表面积为239.6m2/g,兼具B酸和L酸,NH3吸附量为670μmol/g.25%Zr O2-Ti O2对柠檬酸与正丁醇酯化反应催化效果最好,柠檬酸转化率最大,为96.6%,柠檬酸正三丁酯的选择性为98.2%,适宜的反应条件为反应温度115℃,反应时间90 min,反应5次后柠檬酸转化率保持80%以上,柠檬酸三丁酯选择性约为98%.ZrO2-TiO2 composite catalysts were prepared by method of coprecipitation. The crystal morphologies of samples were characterized, specific surface area and pore size distribution of samples were identified, the acid properties of catalysts were identified, and catalytic performances were investigated by esterification of citric acid with n-butyl alcohol. The results showed that when ZrO2 was 25%（ω） among the complex oxide, sample ZrO2-TiO2 was shown amorphous, its specific surface area of 239.6 m2/g, with B acid and L acid centres for NH3 adsorption capacity of 670 μmol/g. Esterification of citric acid with n-butyl alcohol was investigated over 25%ZrO2-TiO2 as catalyst. The conversion rate of citric acid reached to 96.6% and selectivity of trbutyl citrate exhibited is 98.2% while the suitable reaction conditions are reaction temperature of 115 ℃ and balanced time of 90 min. After reaction 5 times, conversion rate of citric acid keens higher than 80%. and selectivitv of tributvl citrate is about 98%.

关 键 词：柠檬酸三丁酯 柠檬酸 正丁醇 二氧化锆 二氧化钛 

分 类 号：TQ225.24[化学工程—有机化工] TQ320.4