Study on Synthesis and Thermal Decomposition Kinetics of Mg(OH)_2 Modified with SDBS by Liquid Phase Method

摘要

The thermal decomposition kinetics of Mg(OH)_2 modified with sodium dodecyl benzene sulfonate (SDBS) by the liquid phase method was investigated using differential thermal analysis and thermo gravimetric (DTA-TG) at different heating rates. The results show that the Mg(OH)_2 modified with SDBS is Mg(OH)_2 with hexagonal phase structure. The average apparent activation energy of the decomposition stages of Mg(OH)_2 modified with SDBS was calculated using the Doyle-Ozawa and Kissinger methods as 169.13 kJ·mol~(-1). The reaction order and frequency factor can be also determined by Kissinger method. The kinetics equations of reaction were deduced as dα/dt = (5.71×10~(12)/β) e~(-20340/T) (1-α)~(1.52).