偶联剂改性对γ-Al_2O_3催化氧化偏三甲苯性能的影响  

Effect of Coupling Agent Modification on the Catalytic Performance of γ-Al_2O_3 for Pseudocumene Oxidation

作　　者：张天永[1,2,3] 刘晓思[1] 李彬[1,3] 王梦颖[1] 王智超[1] 海莉[1] Zhang Tianyong Liu Xiaosi Li Bin Wang Mengying Wang Zhichao Hai Li(Tianjin Key Laboratory of Applied Catalysis Science and Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300354 Collaborative Innovation Center of Chemical Science and Engineering（Tianjin） , Tianjin 300354 Tianjin Engineering Research Center of Functional Fine Chemicals, Tianjin 300354)

机构地区：[1]天津大学化工学院天津市应用催化科学和工程重点实验室,天津300354 [2]天津化学化工协同创新中心,天津300354 [3]天津市功能精细化学品技术工程中心,天津300354

出　　处：《化学通报》2017年第6期573-578,共6页Chemistry

基　　金：国家自然科学基金项目(21276187);天津市自然科学基金项目(16JCYBJC20800);天津市科技创新平台计划项目(14TXGCCX00017)资助

摘　　要：研究了偶联剂改性的廉价填料级γ-Al_2O_3直接催化偏三甲苯(TMB)氧化为2,3,5-三甲基苯醌(TMBQ)性能的影响。结果表明,γ-(2,3-环氧丙基)丙基三甲氧基硅烷(KH560)改性后的填料γ-Al_2O_3催化氧化活性较高。考察了KH560用量、水解时间、吸附时间及吸附温度对催化效果的影响。在优化条件下(2mL KH560/Et OH溶液(体积比1∶25),水解1h,吸附4h,吸附温度50℃),偶联剂对填料γ-Al_2O_3表面产生一定的包覆,在催化氧化TMB时较温和,副反应较少,TMB转化率和TMBQ选择性分别为14.3%和72.4%。Effect of low-cost packing γ-Al2O3 modified with different coupling agents on one-step catalytic oxidation of 1,2,4-trimethylbenzene （TMB） to 2,3,5-trimethylbenzoquinone was studied. Results showed that packing γ-Al2O3 modified with 2,3-epoxypropoxy propyhrimethoxysilicane （KH560） has better catalytic effect. The effects of KH560 amount, hydrolysis time, adsorption time, adsorption temperature on the catalytic reaction were investigated. Packing γ-Al2O3 is coated by KH560 in some extent. Conversion （ 14.3% ） of TMB and selectivity （ 72. 4%） of TMBQ are obtained under optimal conditions ： 2mL of KH560/EtOH （ V： V = 1 ： 25 ） solution, hydrolysis for lh, adsorption time of 4h at 50℃. TMB is mildly catalyzed and oxidized by the modified packing γ-Al2O3 , which leads to less side reactions.

关 键 词：填料γ-Al2O3 偶联剂改性 偏三甲苯 催化氧化 三甲基苯醌 

分 类 号：O621.251[理学—有机化学]