SiO_2负载H_6PMo_9V_2Nb_1O_(40)杂多酸的制备与表征  

Preparation and Characterization of SiO_2 Supported H_6PMo_9V_2Nb_1O_(40) Heteropoly Acid

作　　者：张艳红[1] 钟顺和[1] 

机构地区：[1]天津大学化工学院,天津300072

出　　处：《分子催化》2005年第4期246-250,共5页Journal of Molecular Catalysis(China)

基　　金：国家重大基础研究前期研究专项(2001CCAO3600).

摘　　要：用经典酸化与乙醚萃取相结合的方法,制得了H6PMo9V2Nb1O40杂多酸,并采用等体积浸渍法将其负载到载体SiO2上.通过循环伏安、XRD、BET、TGDTA、IR和UVvis等技术的综合表征表明:H6PMo9V2Nb1O40具有Keggin型杂多酸结构和较强的氧化还原性能,且氧化还原过程可逆性好;这种杂多酸与SiO2载体表面通过端氧和桥氧发生键合作用,负载到SiO2上的杂多酸其比表面积显著增大,并保持了原有的Keggin结构和热稳定性.The heteropoly acid complex H6PMo9V2Nb1 O40 was prepared by a method of combining common acidification with ether extraction and H6PMo9V2Nb1 O40/SiO2 was prepared by an isovolume impregnation method. The characterization of the samples using cyclic voltammetry, XRD, BET, TG-DTA, IR and UV-vis techniques showed that H6PMo9V2Nb1O40 is of Keggin structure and possesses special oxidation-reduction properties with excellent reversibilities. In the H6PMo9V2Nb1O40/SiO2, the bonds linking between heteropoly acid and SiO2 support are formed through bridging oxygen and terrninal oxygen , and the supported heteropoly acid maintains the original Keggin structure and thermal stability.

关 键 词：负载型杂多酸 循环伏安 KEGGIN结构 氧化还原性能 热稳定性 

分 类 号：O643.32[理学—物理化学]