Influence of The Preparation Conditions on the Structure of Hydrotalcite Layered Double Hydroxides
Influence of The Preparation Conditions on the Structure of Hydrotalcite Layered Double Hydroxides
复制标题
制备条件对水滑石层状双氢氧化物结构的影响
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
A. Vertegel
中科院分区：
文献类型：
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作者：
A. Lukashin;Sergei V. Kalinin;M. Nikiforov;A. Zhirov;L. I. Kheifets;V. I. Privalov;A. Vertegel
研究了沉淀条件对镁铝水滑石（LDH）结构的影响. XRD测试表明，在高pH（pH = 9 - 11）条件下，生成水滑石结构的物种，而在低pH（pH = 7 - 8）条件下，生成镁铝尖晶石结构的物种。同时，在pH > 10下获得的样品的27 Al NMR研究揭示了四面体配位的铝的存在。XRD、NMR和IR数据表明，在高pH值下，CO 3 2-部分取代层间Al（OH）4 -，形成氧代铝酸桥。提出了制备插层活性材料的最佳条件。
Influence of the precipitation conditions on the structure of Mg – Al layered double hydroxides (LDH) was investigated. XRD measurements demonstrate that species with hydrotalcite structure forms at high pH of reaction mixture (pH = 9 - 11), while at lower pH values (pH = 7 - 8) species with meixnerite structure arise. At the same time 27 Al NMR studies of samples obtained at pH > 10 reveal the presence of tetrahedrally coordinated aluminum. XRD, NMR and IR data suggest that partial substitution of CO 3 2- for Al(OH) 4 - in the interlayer space with subsequent formation of oxoaluminate bridges takes place at high pH. The optimal conditions for the preparation of intercalation-active materials were proposed.