| Abstract [eng] |
In PhD thesis, the influence of synthesis conditions, the chemical nature of raw materials and additives on the crystallization processes of hydrotalcite and its properties were examined and expedient areas of hydrotalcite application were proposed. It was determined that the modification of Mg containing coumpound as well as the hydrothermal synthesis conditions have a significant infuence on the course of hydrotalcite formation. The optimal conditions of hydrotalcite hydrothermal synthesis in Mg5(CO3)4(OH)24H2O and -Al2O3 mixtures are: the temperature of isothermal curing – 200 °C, duration – 1 h, and primary mixture Mg/Al molar ratio – 2. It was examined that the addition of NaOH and KOH in the primary mixtures, induces not only the interaction between raw materials, but also changes the sequence of obtained intermediate coumpounds during hydrothermal synthesis by reducing the hydrotalcite formation temperature and/or duration. It was determined that by changing the chemical composition of modificated hydrotalcites, the solid-state sintering conditions, microstructure parameters of mixed metal oxides and their nano sized compounds can be controlled. It was examined that chemisorption method is suitable for the immobilization of active components, i. e. transition metal ions, from their solutions into synthetic hydrotalcites. It was determined that hydrothermal synthesis is suitable for the formation of hydrotalcite layer on the Al/Al2O3 surfaces. |
