温度对焙烧Mg-Al水滑石体相结构和表面性质的影响  

Influence of Calaination Temperature on Bulk Structure and Surface Acid and Base Properties of Calained Mg-Al Hydrotalcites

作　　者：李大塘[1] 董奇志[1] 罗娟[1] 郭军[1] 

机构地区：[1]湘潭师范学院化学系,湖南湘潭411201

出　　处：《湘潭大学自然科学学报》2000年第1期42-45,共4页Natural Science Journal of Xiangtan University

基　　金：湖南省自然科学基金!(NO:98JJY2057);湖南省教委资助课题

摘　　要：研究了焙烧温度对焙烧MgAl水滑石体相结构和表面性质的影响 .在 6 73K、873K和 10 73K温度下焙烧样品的MAS2 7Al核磁共振结果呈现显著的物相转变 ,其转变中的过渡态对确定样品表面酸碱性质显得很重要 .This paper describes the influence of calcination temperature on the bulk structure and surface properties of the calained hydrotalcite with Mg/Al amountofsubstance ratio of 3 . Results of solidstate magicangelspinning 27 Al NMR,revealed that significant phase transitions occur in the samples upon calcination at 673 K,873 K, 1 073 K, respectively. These transitions seem very important to determination of the surface acid/base properties for the samples. Furthermore,the binding energies of Al 2S and O 1S of the samples determined by XPS are found to be proportional to the strength of surface acid and base sites of the samples

关 键 词：温度 镁-铝水滑石 表面性质 体相结构 

分 类 号：O643.36[理学—物理化学]