Non-isothermal kinetics of thermal decomposition of basic cobalt carbonate

作者：Liu Bing Guo; Peng Jin Hui^*; Zhang Li Bo; Zhang Ze Biao; Guo Sheng Hui; Zhang Shi Min

来源：Journal of Central South University(Science and Technology), 2011, 42(2): 356-360.

• Activation energy E
• Air atmosphere
• Basic cobalt carbonates
• Coats-Redfern method
• Decomposition process
• Flynn-Wall-Ozawa
• Kissinger methods
• Mass loss
• Model fitting
• Model free
• Non-isothermal kinetic
• Non-isothermal kinetics
• Nucleation and growth model
• Thermal decomposition
• Thermal decomposition behavior
• Thermal decompositions
• Two stage
• XRD

Kinetics and thermal decomposition behavior of basic cobalt carbonate was investigated using TG and XRD at various heating rates. Kinetic parameters of decomposition of basic cobalt carbonate for the second-stage was calculated and analyzed using model-fitting (Coats-Redfern method and Achar method) and model-free (Kissinger method and Flynn-Wall-Ozawa method). The results show that the decomposition process of basic cobalt carbonate is divided into two stages: the crystallization water begins to dehydrate at 303 K, decomposition of basic cobalt carbonate follows at 493 K and changes into Co3O4 powder decomposition completely above 625 K in air atmosphere. The mass loss of decomposition of basic cobalt carbonate is 29.5%, which is in good agreement with the theoretical mass loss. Activation energy E and lg A are 106.139-144.537 kJ/mol and 9.396-11.868, respectively. The mechanism function is nucleation and growth model.

• 出版日期2011