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Journal of Thermal Analysis and Calorimetry

, Volume 134, Issue 3, pp 2339–2347 | Cite as

Non-isothermal kinetics study on the thermal decomposition of brucite by thermogravimetry

  • Chuanjiang Liu
  • Tao Liu
  • Duojun WangEmail author
Article
  • 99 Downloads

Abstract

The non-isothermal decomposition kinetics of brucite under nitrogen atmosphere was studied using thermogravimetry and XRD techniques. The curves of mass loss with temperature implied that the first step of thermal decomposition took place at 300–400 °C, followed by a relatively slow process up to 600 °C. The initial decomposition temperature was significantly affected by heating rate, but it had no obvious influence on the total yield of water molecules. The apparent activation energies were calculated to be 144.29 kJ mol−1 to 148.82 kJ mol−1 in the given range of conversion, and the dependence of E on the extent of conversion indicated the existence of a consecutive process. The kinetic differential equation was established as dα/dT = (1.68 × 109/β) exp(− 1.70 × 104/T) (1 − α). The thermal decomposition could be described by first-order single reaction model for the main step, whereas it was dominated by the diffusion of water molecule at the mid-late stages.

Keywords

Non-isothermal Kinetics Brucite Thermogravimetry Mechanism 

Notes

Acknowledgements

The authors thank the staff of beamline BL14B1 of the SSRF (Shanghai Synchrotron Radiation Facility) for providing beam time and help during the experiments. This work is financially supported by the Natural Science Foundation of China [Grant Number 41603061].

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  1. 1.Key Laboratory of Computational GeodynamicsUniversity of Chinese Academy of SciencesBeijingPeople’s Republic of China

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