中文摘要：

研究了偶联剂改性的廉价填料级γ-Al2O3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-Al2O3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-Al2O3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%。

英文摘要：

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.