利用二水草酸钴、二水草酸锰构建CoC₂O₄/MnC₂O₄复合催化剂,并将其用于乙苯选择性氧化制备苯乙酮,通过气相色谱仪(GC)对产物进行定量分析。通过单因素与设计正交实验等方法探究反应的最佳工艺条件。结果表明,最佳工艺条件为反应温度为120℃、钴锰摩尔比为2∶1、固液比为1.0,此时,乙苯转化率与苯乙酮选择性最高,分别为26.58%与81.19%。在最佳反应条件下,将氧源替换为氧气,乙苯转化率与苯乙酮选择性分别为52.2%与90.25%。该催化剂具有优异的循环使用性能,在50次内的催化效果基本不变。CoC₂O₄/MnC₂O₄复合催化剂体系克服了传统乙酸钴催化剂易被氧化、易结块、不能循环等缺点,能够有效提高催化剂的利用率,降低生产成本。

CoC₂O₄/MnC₂O₄ composite catalyst is constructed from cobalt oxalate dihydrate and manganese oxalate dihydrate,and applied to catalyze the selective oxidation of ethylbenzene to acetophenone.The products are quantitatively analyzed by means of gas chromatography.Through the single factor experiment and designing orthogonal experiment,the optimum conditions are obtained as follows:reaction temperature is 120℃,the molar ratio between Co and Mn is 2∶1,and the ratio solid-liquid is 1.0.Under the optimum conditions,the conversion of ethylbenzene and the selectivity of acetophenone are 26.58% and 81.19%,respectively.Also under the optimal conditions,the conversion of ethylbenzene and the selectivity of acetophenone are 52.2% and 90.25%,respectively as the oxygen source is replaced by oxygen.In particular,the catalyst has excellent recycling performance,and its catalytic effect remains basically unchanged within 50 times.CoC₂O₄/MnC₂O₄ composite catalyst system overcomes the shortcomings of traditional cobalt acetate catalyst,such as easy oxidation,caking,and inability to be recycled.The utilization efficiency of the catalyst is effectively improved,and the production cost is hence reduced,showing a good industrial application potential.

范磊(1996-),男,硕士研究生,研究方向为有机催化,473270224@qq.com