Thermal Behavior and Decomposition of Intercalated Kaolinite

TLDR: In this paper, the thermal behavior and decomposition of a Hungarian kaolinite-potassium acetate complex was studied by simultaneous TA-EGA, XRD, and FTIR methods.

Abstract: Intercalation complexes of a Hungarian kaolinite were prepared with hydrazine and potassium acetate The thermal behavior and decomposition of the kaolinite-potassium acetate complex was studied by simultaneous TA-EGA, XRD, and FTIR methods The intercalation complex is stable up to 300°C, and decomposition takes place in two stages after melting of potassium acetate intercalated in the interlayer spaces Dehydroxylation occurred, in the presence of a molten phase, at a lower temperature than for the pure kaolinite FTIR studies revealed that there is a sequence of dehydroxylation for the various OH groups of intercalated kaolinite The reaction mechanism was followed up to 1000°C via identification of the gaseous and solid decomposition products formed: H2O, CO2, CO, C3H6O, intercalated phases with basal spacings of 141 A, 115 A, and 85 A as well as elemental carbon, K4H2(CO3)3 · 15H2O, K2CO3 · 15H2O, and KAlSiO4