微波辐射sol-gel制备纳米SO_4^(2-)/TiO_2及其催化应用  

Nano SO_4^(2-)/TiO_2 prepared by microwave radiation sol-gel method and its catalytic application

作　　者：张扬[1] 邹佳智 张昌昌[1] 杨星法 庄吕超 张立庆[1] 

机构地区：[1]浙江科技学院生物与化学工程学院,杭州310023

出　　处：《浙江科技学院学报》2016年第1期48-52,57,共6页Journal of Zhejiang University of Science and Technology

基　　金：浙江省自然科学基金项目(Y404082);国家级大学生创新创业训练计划项目(201411057012)

摘　　要：采用微波辐射溶胶-凝胶法制备纳米级SO2-4/TiO2催化剂,以丙酸与正戊醇的酯化反应为探针反应,探究催化剂制备条件对催化活性的影响。并且采用Hammett指示剂法、BET法、XRD和TEM进行表征。结果表明,催化剂的最佳制备条件为乙酸12mL,无水乙醇10mL,去离子水4mL,微波辐射功率500 W。在常规加热条件下,当酸醇摩尔比为1∶1.3,催化剂用量为0.7g,反应时间为2h时,产率为98.11%。该方法制备得到的催化剂酸强度H0≤-13.16,为固体超强酸,催化剂比表面较大,其中TiO2为锐钛相,且分布比较分散。Nanoscale SO2-4/TiO2 catalyst was prepared by tetra-n-butyl titanate,anhydrous ethanol and acetic acid with microwave-assisted sol-gel method.The catalytic activity affected by catalyst preparation condition between propionic acid and amyl alcohol esterification reaction was investigated.The characterization of catalyst was tested by Hammett tracer method,BET,XRD and TEM.The results showed that the best preparation condition of catalyst is acetic acid 12 mL,anhydrous ethanol10 mL,ionized water 4mL and microwave radiation power 500 W.Under the conventional heating and optimal esterification condition,the mole ratio of acid to alcohol is 1∶1.3,the amount of catalyst is 0.7g,the reaction time is 2h,and the yield of n-pentyl propionate reaches 98.11%.SO2-4/TiO2 catalyst is superacid with acid strength H0 ≤-13.16,and the catalyst surface is bigger.The TiO2 is sharp titanium phase,and the distribution is scattered.

关 键 词：丙酸正戊酯 固体超强酸 微波辐射 溶胶-凝胶法 

分 类 号：TQ225.24[化学工程—有机化工] O643.32[理学—物理化学]