Thermal decomposition of glucose and sucrose by kinetics analysis

Thermal decomposition process of glucose and sucrose was studied by TG-DTA. The Kissinger, Friedman and non-linear regression methods were used to obtain the reaction decomposition mechanism and kinetic parameters. The results showed that the decomposition of glucose was much easier than that of sucrose. The orders of decomposition reaction for glucose in two stages were 2 and 1 respectively. However, for sucrose, the order of decomposition reaction in two stages was n and 1 respectively. Non-linear fitting of glucose and sucrose was given a complete thermal decomposition reaction pathways and kinetic parameters. The activation energy of glucose in three stages was respectively 132, 150 and 253 kJ/mol, and pre-exponential factor 11.6, 11.1 and 19.6 s^-1, and activation energy of sucrose in two stages was 105 and 229 kJ/mol, and pre-exponential factor 8.2 and 18.6 s^-1.