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The Dehydration and Dehydration Kinetics of Cobalt (Ⅱ)-hexamethylenetetramine and Nickel (Ⅱ)-hexamethylenetetramine Compounds

Author: LiuJinQuan
Tutor: GaoYanYang
School: University of North
Course: Inorganic Chemistry
Keywords: Cobalt(Ⅱ) Nickel(Ⅱ) Hexamethylenetetramine Dehydration Thermal decomposition kinetics
CLC: O643.12
Type: Master's thesis
Year: 2010
Downloads: 9
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Abstract


Two cobalt（Ⅱ）-hexamethylenetetramine compounds and two nickel（Ⅱ）-hexamethylenetetramine compounds have been synthesized with CoCl2·6H2O （orNiCl2·6H2O） and hexamethylenetetramine, and characterized by means of elementaryanalysis and TG technique. The thermochromism, dehydrations and dehydrationkinetics of these compounds were studied.The composition of these compounds was defined by elementary analysis and TG.The compounds prepared by liquid phase reaction process are CoCl2·2C6H12N4·10H2Oand NiCl2·2C6H12N4·10H2O respectively, yet the compounds prepared by roomtemperature solid state process are CoCl2·2C6H12N4·7H2O and NiCl2·2C6H12N4·2H2Orespectively.Thermochromic experiments prove that CoCl2·2C6H12N4·10H2O andCoCl2·2C6H12N4·7H2O have good reversible thermochromism. Color’s change owingto dehydration of CoCl2·2C6H12N4·10H2O and hydration of CoCl2·2C6H12N4·7H2O. ButNiCl2·2C6H12N4·10H2O and NiCl2·2C6H12N4·2H2O have no visible color’s change atthe temperature when heating the crystals until 100℃.The dehydration kinetics of the four compounds were investigated using thenon-isothermal method by TG technique. The dehydration mechanism and associatedkinetics parameters were determined. The dehydration of CoCl2·2C6H12N4·10H2O andCoCl2·2C6H12N4·7H2O are all controlled by random nucleation and nuclei growthmechanism, the apparent activation energy are 104.40 kJ·mol-1 and 104.62 kJ·mol-1，and pre-exponential factor are 1013.20s-1 and 1013.96s-1, respectively.The dehydration mechanism of NiCl2·2C6H12N4·10H2O is different from that ofNiCl2·2C6H12N4·2H2O. The first stage of the dehydration of NiCl2·2C6H12N4·10H2O is controlled by chemical reaction, with the apparent activation energy and preexponentialfactor are 233.32kJ·mol-1 and 1033.00s-1, respectively. The second stage ofthe dehydration is controlled by random nucleation and nuclei growth mechanism,with the apparent activation energy and pre-exponential factor are 188.51kJ·mol-1 and1023.03s-1, respectively. Yet the dehydration of NiCl2·2C6H12N4·2H2O is controlled bycontracting sphere （spherical symmetry） mechanism, with the apparent activationenergy and pre-exponential factor are 100.35kJ·mol-1 and 1013.23s-1, respectively.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Chemical kinetics > The mechanism and kinetics of chemical reactions
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