Decomposition kinetics of alkaline earth carbonates by integral approximation method

Cerâmica

S. Maitra²  N. Chakrabarty¹  J. Pramanik¹ 

[1] ,Govt. College of Engineering and Ceramic TechnologyKolkata,India

关键词: decomposition;    alkaline earth carbonates;    non-isothermal kinetics;    thermogravimetry;    decomposição;    carbonatos de terra alcalina;    cinética não isotérmica;    termogravimetria;   

DOI  :  10.1590/S0366-69132008000300001

来源: SciELO

【 摘 要 】

The decomposition kinetics of four synthetic alkaline earth metal carbonates (MgCO3, CaCO3, SrCO3 and BaCO3) was studied under non-isothermal conditions from thermo-gravimetric measurements as compared to. The integral approximation method of Coats and Redfern was used to determine the kinetic parameters for the decomposition processes. The decomposition reactions followed mostly first order kinetics and the activation energy of the decomposition reactions increased with the increase in the molecular mass of the carbonates. The change in enthalpy for the decomposition processes was also calculated and compared with the activation energies for the decomposition processes. The activation energy of the decomposition process for all the carbonates was higher than the enthalpy of the reaction excepting SrCO3.

【 授权许可】

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