Mg-Al-O复合氧化物催化剂的表面酸碱性质(Ⅲ):体相结构研究

Surface acidity and basicity of Mg-Al-O mixed oxide catalyst(Ⅲ): bulk structural stuties

研究了在不同温度下焙烧Mg -Al-O复合氧化物催化剂的体相结构与表面酸碱性质的关系。固态MAS2 7AlNMR结果显示在 673K、873K和 10 73K焙烧的样品出现了明显的物相过渡态 ,该过渡态在确定样品的表面酸碱性质是很重要的。XPS测定样品中Al2S和OIS的结合能 ,结果表明 。

This paper describes the relation between the bulk structure and surface acidty and basicity of Magnesium-Aluminum mixed oxides obtained from hydrotalcite compounds with Mg/Al amount-of-substance ratio of 3 upon calcination at 673、873 amd 1073K, respectively Results of MAS 27 Al NMR revealed that significant phase transitions occur in the samples These transitions are important in determining the surface acid/base properties of the samples Furthermore, the binding energies of Al 2S and O 1S of the samples determined by XPS can be related to its the strength of surface acid and base sites