Acta Phys. -Chim. Sin. ›› 2008, Vol. 24 ›› Issue (12): 2263-2267.doi: 10.3866/PKU.WHXB20081219

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Preparation, Thermal Behavior and Non-isothermal Decomposition Reaction Kinetics of Zr(3-NO2-PHT)2·2H2O

ZHANG Heng, ZHAO Feng-Qi, YI Jian-Hua, ZHANG Xiao-Hong, HU Rong-Zu, XU Si-Yu, REN Xiao-Ning   

  1. Xi’an Modern Chemistry Research Institute, Xi’an 710065, P. R. China
  • Received:2008-08-01 Revised:2008-09-18 Published:2008-12-04
  • Contact: ZHAO Feng-Qi

Abstract: Zirconium 3-nitrophthalate (Zr(3-NO2-PHT)2·2H2O) was synthesized using 3-nitrophthalic acid, sodium hydroxide, and zirconyl nitrate as raw materials. Its structure was determined by elemental analysis, X-ray fluorescence and FT-IR spectra. The thermal decomposition mechanism and kinetic parameters of the decomposition reaction for Zr(3-NO2-PHT)2·2H2O were investigated by temperature-programmed TG-DTG and condensed-phase thermolysis/FT-IR techniques. A kinetic equation for the decomposition reaction was obtained. The results showed that Zr(3-NO2-PHT)2·2H2O underwent a four-stage decomposition process and that the main decomposition reaction occurred during the second process. The apparent activation energy (Ea) and pre-exponential factor (A) of the main decomposition reaction are 158.84 kJ·mol-1 and 109.85 s-1, respectively. The kinetic equation can thus be expressed as: dα/dt=109.85(1-α)e-1.91×104/T.

Key words: Zr(3-NO2-PHT)2·2H2O, Thermal decomposition mechanism, Nonisothermal reaction kinetics


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