CRCU

Chemical Research in Chinese Universities ›› 2010, Vol. 26 ›› Issue (2): 300-303.

• Articles • Previous Articles     Next Articles

Non-isothermal Decomposition Mechanism and Kinetics of LiClO4 in Nitrogen

HONG Jian-he1,2, SONG Li2,3, ZHOU Xin-wen4, DIAKITE Kahirou2 and ZHANG Ke-li2*   

  1. 1. Engineering Research Center of Nano-Geomaterials of Ministry of Education, China University of Geosciences, Wuhan 430074, P. R. China;
    2. College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P. R. China;
    3. Department of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, P. R. China;
    4. College of Chemistry and Life Science, China Three Gorges University, Yichang 443002, P. R. China
  • Received:2009-03-17 Revised:2009-05-15 Online:2010-03-25 Published:2010-05-25
  • Contact: ZHANG Ke-li. E-mail: klzhang@whu.edu.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.20071026).

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Abstract:

The non-isothermal decomposition kinetics of LiClO4 in flow N2 atmosphere was studied. TG-DTA curves show that the decomposition proceeded through two well-defined steps below 900 °C, and the mass loss was in agreement with the theoretica1 value. XRD profile demonstrates that the product of the thermal decomposition at 500 °C is LiCl. For the decomposition kinetics study, the activation energies calculated with the Friedman method were considered as the initial values for non-linear regression and were used for verifying the correctness of the fitted models. The decomposition process was fitted by a two-step consecutive reaction: extended Prout-Tompkins equation[Bna, f(α) is (1-α)nαα] followed by a 1th order reaction(F1). The activation energies were (215.6±0.2) and (251.6±3.6) kJ/mol, respectively. The exponentials n and α for Bna reaction were (0.25±0.05) and (0.795±0.005), respectively. The reaction types and activation energies were in agreement with those obtained from the isothermal method, but the exponentials were optimized for better fitting and prediction.

Key words: LiClO4; Decomposition mechanism; Non-isothermal kinetics; Non-linear regression