SiO_2与Keggin杂多酸相互作用的研究  

Investigation of Interaction between SiO_2 and Keggin Heteropolyacids

作　　者：陈霄榕[1] 李永丹[1] 康慧敏[1] 张继炎[1] 张鎏[1] 

机构地区：[1]天津大学化学工程学院碳一化工国家重点实验室催化科学与工程系,天津300072

出　　处：《分子催化》2002年第1期60-64,共5页Journal of Molecular Catalysis(China)

摘　　要：采用经典酸化与乙醚萃取相结合的方法 ,制备了 Keggin型杂多酸 H3PMo1 2 O40 ,并以 Si O2 为载体制备了经不同温度焙烧的负载型杂多酸样品 .利用 TG、DTA、IR、XPS、NH3- TPD等手段 ,对负载前后的杂多酸样品进行了表征 ;考察了 Si O2 与杂多酸之间的相互作用以及载体对杂多酸酸性的影响 .研究发现 ,Si O2 载体的引入 ,可以有效改善杂多酸的热稳定性 ;焙烧温度的升高 ,会显著降低杂多酸的酸性 .并提出了 Si O2A conventional acidification method incorporated with an ether extraction technique was used to prepare H\-3PMo\-\{12\}O\-\{40\} with Keggin structure. Silica supported heteropoly acids(HPA) were prepared at different calcination temperatures. The unsupported and supported HPA were characterized by TG, DTA, IR, XPS and NH\-3\|TPD techniques. The influence of SiO\-2 on HPA acidity and the interaction between SiO\-2 and HPA were investigated. It was found that the support SiO\-2 improves the thermal stability of HPA, and the increase of calcination temperature obviously lowers the HPA acidity. An interaction modle between SiO\-2 and HPA is proposed.

关 键 词：杂多酸 酸性 热稳定性 相互作用 二氧化硅 KEGGIN结构 负载型催化剂 表征 

分 类 号：TQ426.6[化学工程] O643.36[理学—物理化学]