Synthesis and characterization of layered double hydroxides with different cations (Mg,Co, Ni,Al), decomposition and reformation of mixed metal oxides to layered structures |
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| Authors: | Kristina Klemkaite Igoris Prosycevas Ricardas Taraskevicius Alexander Khinsky Aivaras Kareiva |
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| Institution: | (1) State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, P.R. China;(2) Department of Catalysis Science and Technology and Tianjin Key Laboratory of Applied Catalysis Science & Technology, School of Chemical Engineering, Tianjin University, Tianjin, 300072, P.R. China |
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| Abstract: | Three layered double hydroxides (LDH) Mg1−xAlx(OH)2]x+(Am−)x/m]·nH2O and MII
1−xMIII
x (OH)2]x+(Am−)x/m]·nH2O (MII — Mg, Co, Ni; MIII — Al; A — CO3
2−) were successfully synthesized by the low supersaturation method. The as-synthesized LDH samples were thermally decomposed
and the derived mixed metal oxides reformed back to layered structures in water and magnesium nitrate media at different temperatures.
All synthesized samples were characterized by X-ray diffraction (XRD) analysis, thermogravimetric (TG) analysis, X-ray fluorescence
(XRF) analysis and scanning electron microscopy (SEM). The results of XRD and XRF analyses showed that single-phase layered
double hydroxides were formed during synthesis and reformation. It was demonstrated, that a partially substituted by cobalt
and nickel LDH samples also show memory effect. The crystallite size of regenerated LDH depends on the regeneration media,
temperature and chemical composition. The LDH samples after regeneration consist of large particles with sharp edges along
with a large amount of smaller particles |
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