NiMgAl三元类水滑石的制备研究
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摘要: 在Ni(NO3) 2-Mg(NO3) 2-Al(NO3) 3-NaOH体系中，研究了共沉淀法制备NiMgAl三元类水滑石的合成规律。考察了pH值、Ni/Mg/Al比、沉淀生成温度及水热处理条件对合成NiMgAl-HTLcs的影响，借助XRD 、ICP、 FT-IR对合成样品进行表征。实验结果表明，合成NiMgAl-HTLcs的适宜pH范围为5.5～7.0，Ni/Mg=2.0～4.0，水热处理条件为100 ℃，7 h。通过对合成物热行为研究表明，NiMgAl-HTLcs结构开始破坏温度为300 ℃，经焙烧后可得Ni元素高度分散的复合氧化物。Abstract: The synthesis principal of NiMgAl hydrotalcite-like compounds by co-precipitation was studied in the system of Ni(NO3) 2-Mg(NO3) 2-Al(NO3) 3-NaOH. The effect of pH Ni/Mg ratios, co-preciptation temperature, time and temperature of hydrothermal treatment on the synthesis of NiMgAl-HTLCs were also investigated. The synthesized samples were characterized by using XRD, ICP, and FT-IR. Experimental results showed that unique NiMgAl-HTLcs with high crystallinity can be prepared by precipitation of solutions with M2+/M3+=2.0 and Ni/Mg=2.0～4.0 at pH=5.5～7.0, 100 ℃，7 h hydrothermal treatment. Study on the thermal stability of NiMgAl-HTLcs showed that the structure started to be destroyed at 3 00 ℃.
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Key words:
- hydrotalcite-like-compound /
- anionic clay /
- layered compound
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