氧化镁负载钼钒磷酸铜催化剂上正己醇氧化脱氢制正己醛  

MgO-Supported Cu_2 PMo_(11)VO_(40) Catalyst for OxidativeDehydrogenation of n-Hexanol to n-Hexanal

作　　者：周广栋[1] 郭晓红[1] 吕学举[1] 李亚男[1] 程铁欣[1] 李文兴[1] 甄开吉[1] 

机构地区：[1]吉林大学化学学院,吉林长春130021

出　　处：《催化学报》2005年第5期389-392,共4页

基　　金：国家博士点专项基金资助项目 ( 19990 183 0 8)

摘　　要：采用乙醇溶液浸渍法制备了MgO负载的Cu2 PMo11VO40 催化剂,考察了催化剂对正己醇氧化脱氢生成正己醛的催化性能,确定了最佳反应条件.催化剂经5 0h反应后活性没有下降,生成正己醛的选择性保持在96 0 %以上.IR光谱和TPR结果表明,在反应条件下催化剂上不断有V5+从Keggin结构中移出,与Cu2 +一起作为抗衡离子存在于Keggin结构单元之外,形成缺位的Keggin型结构,使催化剂处于活化状态;Cu2 +的存在使催化剂的还原温度降低,Keggin结构之外的V5+与Cu2 +之间存在相互作用。The Cu2PMo11VO40/MgO catalyst was prepared by impregnating MgO with the alcohol solutions of copper nitrate and molybdovanadophosphoric acid successively. The catalyst was used for the oxidative dehydrogenation of n-hexanol to form n-hexanal. The catalyst activity remained unchanged and the selectivity for n-hexanal was higher than 96.0% after reaction for 50 h at 280 degrees C. The results of IR and TPR showed that the Cu2PMo11VO40 kept its Keggin type structure after being supported on MgO. V5+ cations removed from the Keggin unit and presented as the counterions together with Cu2+ cations during the reaction, which resulted in the formation of lacunar heteropolyanion. There was a synergic effect between the V5+ and Cu2+ cations, which was responsible for the high catalytic activity.

关 键 词：氧化镁 磷 钼 钒 铜 杂多酸 正己醇 正己醛 

分 类 号：TQ223[化学工程—有机化工]