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利用Keggin结构可以发生同晶取代的性质,合成了含过渡金属离子铬、镍的羟基铝交联蒙托土,并运用XRD、~(27)Al-NMR、UV-DRS、XPS、TPR等方法研究了Keggin结构的作用。结果表明,铬、镍都可以和铝生成具有Keggin骨架结构的羟基共聚体,并以此作柱子支撑着蒙托土的层间。铬的取代反应比镍容易发生。共聚法合成出的羟基镍铝交联蒙托土中镍存在两种状态;过量的金属离子对Keggin结构有较大地破坏;Keggin结构的存在增加了交联蒙托土的热稳定性。
The Keggin structure can be used for the isomorphous substitution. Aluminum hydroxyapatite cross-linked montmorillonite containing transition metal ions chromium and nickel was synthesized and characterized by XRD, ~ (27) Al-NMR, UV-DRS, XPS and TPR The role of Keggin structure was studied. The results show that both chromium and nickel can form hydroxyl interpolymer with Keggin framework with aluminum, and can be used as a pillar to support the montmorillonite interlayer. Chromium substitution reaction easier than nickel. Nickel-aluminum-nickel cross-linked montmorillonite in the copolymerization method has two states of nickel; excess metal ions greatly damage the Keggin structure; and the presence of Keggin structure increases the thermal stability of the cross-linked montmorillonite.