Al_2O_3或SiO_2负载钒氧化物催化剂的紫外-拉曼光谱比较研究  

Comparative study on Al_2O_3 or SiO_2 supported vanadium oxides by UV-Raman spectrometry

作　　者：刘坚[1] 赵震[1] 徐春明[1] 段爱军[1] 姜桂元[1] 

机构地区：[1]中国石油大学(北京)重质油国家重点实验室,北京102249

出　　处：《工业催化》2008年第10期35-37,共3页Industrial Catalysis

基　　金：国家自然科学基金(20773163;20473053;20525621);北京市自然科学基金(2062020);863项目(2006AA06Z346)

摘　　要：用柠檬酸络合助溶的等体积浸渍法制备了氧化铝和氧化硅负载的系列钒氧化物催化剂,使用紫外-拉曼光谱对催化剂的结构进行了表征。结果表明,负载钒氧化物的结构与钒的负载量和载体类型有关,在低钒负载量时以隔离的钒氧物种为主;在高负载量时,钒氧化物在γ-Al2O3载体上以聚合的钒氧物种和V2O5共存,在SiO2载体上主要以隔离的钒氧物种和V2O5形态为主,并有少量聚合的钒氧物种。Al2O3- or SiO2-supported vanadium oxide catalysts were prepared by citric acid-assisted incipient-wetness impregnation method, and their structures were characterized by UV-Raman spectrometry. The results indicated that the structure of supported vanadium catalysts was dependent on the vanadium loadings and types of the supports. At lower vanadium loadings, there existed isolated monovanadate species on the catalyst surface. At higher vanadium loading, VOx species existed as polyvanadate species and V2O5 on Al2O3, but vanadium existed predominantly as isolated monovanadate species and V2O5 with a little amount of polyvanadate species on SiO2.

关 键 词：催化化学 负载氧化物催化剂 紫外拉曼光谱 氧化铝 氧化硅 

分 类 号：O643.36[理学—物理化学] O614[理学—化学]