微波条件下V_2O_5/TiO_2低温选择氧化甲苯制苯甲酸  

MICROWAVE CATALYTIC PROCESS: LOW-TEMPERATURE SELECTIVE OXIDATION OF TOLUENE TO BENZOIC ACID OVER V_2O_5/TiO_2

作　　者：刘晔[1] 刘蒲[1] 高润雄[1] 刘省明[1] 赵转云[1] 殷元骐[1] 

机构地区：[1]中国科学院兰州化学物理研究所

出　　处：《催化学报》1998年第3期224-228,共5页

摘　　要：在微波辐射条件下，考察了甲苯选择氧化过程中催化剂床层温度、Ｏ２／甲苯比、原料气总空速、Ｖ２Ｏ５担载量和添加氧化物助剂等条件对Ｖ２Ｏ５／ＴｉＯ２催化剂活性的影响．结果表明，在微波作用下，当床层温度在２５０℃，Ｏ２／甲苯摩尔比６和原料气总空速１００００ｈ－１时，１％ＭｏＯ３－８％Ｖ２Ｏ５／ＴｉＯ２上的苯甲酸和苯甲醛的收率分别达到４１％和１４％．与传统加热的催化过程相比，苯甲酸和含氧化物的收率均有较大的提高．还初步探讨了微波对催化剂活性的影响．Under microwave irradiation, the effects of reaction bed temperature, O 2/toluene ratio, total space velocity (SV) of feed gas and V 2O 5 loading were investigated in order to optimize the reaction conditions over V 2O 5/TiO 2 for the selective oxidation of toluene. It was suggested that when the reaction bed temperature was 250℃, O 2/toluene molar ratio was 6, the total SV was 10000 h -1 , and the V 2O 5 loading was 8%, the catalytic activity of V 2O 5/TiO 2 was the highest with 20% yield of benzoic acid. Specially, in the microwave catalytic process the modification of V 2O 5/TiO 2 with MoO 3 or Ag 2O, which had no or negative influence on the titled reaction in the conventional case, greatly promoted the selective oxidation of toluene leading to further improvement in the catalyst performance in terms of benzoic acid yield (41%). Compared with the conventional catalytic process, the effects of microwave electromagnetic field on the catalysts were also discussed tentatively.

关 键 词：微波 五氧化二钒 甲苯 氧化 苯甲酸 制备 催化剂 

分 类 号：TQ245.12[化学工程—有机化工]