Calculation of the Kinetic Parameters of Dehydration of Lithium Peroxide Monohydrate in Nonisothermic Regime by Derivatographic Method

摘要

The dehydration of lithium peroxide monohydrate was studied by derivatography under nonisothermic conditions for the calculation of main kinetic parameters in the temperature range 90-146°C. Experimental conditions (sample size and the linear heating rate) caused by thermoconductivity of the object under investigation were determined. It is shown that the process under study proceeds according to the kinetic law close to the first order one (n = 0.85±0.03). Values of the activation energy and the pre-exponential factor [E_a = 86.0±0.8 kJ mol~(-1) k0 = (2.19±0.16)x10~(11) min~(-1) ] were obtained. A suggestion was formulated that the dehydration mechanism of lithium peroxide monohydrate was analogous to that of the hydrates of the alkaline earth metal (calcium, barium, and strontium) peroxides.