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.
出处
《工业催化》
CAS
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)
