水热法制备铜锰纳米复合氧化物及选择氧化苯甲醇制苯甲醛  

Hydrothermal synthesis of Cu-Mn nanocomposite oxides and selective catalytic oxidation of benzyl alcohol to benzaldehyde

作　　者：韩艳华[1] 张飞跃[1] 张少龙[1] 范闽光[1] 李斌[1] 李景林[1] 

机构地区：[1]广西大学化学化工学院,广西南宁530004

出　　处：《现代化工》2011年第5期60-62,64,共4页Modern Chemical Industry

基　　金：国家自然科学基金(20763001);国家自然科学基金(21063001)

摘　　要：采用水热法制备出一系列铜锰纳米复合氧化物,考察了样品选择催化氧化苯甲醇的性能。结果表明,铜锰摩尔比小于1时产物主要是尖晶石型的Cu1.5Mn1.5O4,大于1时产物主要是Cu0.451Mn0.549O2,等于1时则是二者共存,所有样品均为厚度约10 nm的纳米片。铜含量增加时催化剂的还原温度降低,Cu0.451Mn0.549O2的催化活性比Cu1.5Mn1.5O4好。反应温度300℃,苯甲醇质量空速3.13 h-1时,苯甲醇转化率和苯甲醛选择性分别为94.14%和83.73%。A series of Cu-Mn nanocomposite oxides is prepared by hydrothermal synthesis. The products are characterized by XRD, SEM and H2 -TPR. The catalytic performance of the selective catalytic oxidation of benzyl alcohol is investigated. The results show that when the molar ratio of Cu and Mn is greater than 1, the products are composed of Cu0.451Mn0.549O2 ,and spinel structure of Cu1.5Mn1.5O4 are obtained when their molar ratio is less than 1. In the case of the molar ratio of 1, the two oxides are mixed. All of the samples are nanosheets with thickness less than 10 nm. The reduction temperature decreases with the increase of the amount of Cu. Cu0.451Mn0.549O2 has higher catalytic activities than Cu1.5Mn1.5O4. When the reaction temperature is 300℃ and the velocity of benzyl alcohol is 3. 13 h^-1, the conversions of benzyl alcohol and the selectivity for benzaldehyde,are 94. 14% and 83.73% ,respectively.

关 键 词：纳米复合氧化物 水热法 苯甲醇 苯甲醛 选择氧化 

分 类 号：O643.36[理学—物理化学]