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Thermal decomposition kinetics of potassium iodate

Part I. The effect of particle size on the rate and kinetics of decomposition

Journal of Thermal Analysis and Calorimetry
Author: K. Muraleedharan

particle size on the thermal decomposition kinetics of KIO 3 by isothermal thermogravimetry. In this study, the influence of heat and mass transfer phenomena has been left aside. The great emphasis is given to reliable activation energy values for the

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. Bertol , CD , Cruz , AP , Stulzer , HK , Murakami , FS , Silva , MAS . Thermal decomposition kinetics and compatibility studies of primaquine under isothermal and non-isothermal conditions . J Therm Anal Calorim 2010 102 : 187 – 192 10.1007/s

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Journal of Thermal Analysis and Calorimetry
Authors: V. M. Abdul Mujeeb, K. Muraleedharan, M. P. Kannan, and T. Ganga Devi

thermal decomposition kinetics was studied by TG at 668 K [ 42 ]. The samples decomposed in two stages governed by the same rate law (contracting square equation), but with different rate constants, k 1 (for α ≤ 0.45) and k 2 (for α ≥ 0.45), as in the

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. Particularly for [Q][Bi(dmit) 2 ], the packing of the anions in solid state is strongly dependent on [Q + ] [ 12 ]. The main goal of the present work is to study the thermal decomposition kinetics of tetraalkylammonium and dimethylpyridinium salts of

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thermal decomposition kinetics of magnesite enable us to better understand the decomposition mechanism, control steps, and the various factors on the process of thermal decomposition, thereby allowing us to optimize the thermal decomposition conditions for

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Abstract  

A new unsymmetrical solid Schiff base (LLi) was synthesized using L-lysine, o-vanillin and 2-hydroxy-l-naphthaldehyde. Solid lanthanum(III) complex of this ligand [LaL(NO3)]NO3·2H2O have been prepared and characterized by elemental analyses, IR, UV and molar conductance. The thermal decomposition kinetics of the complex for the second stage was studied under non-isothermal condition by TG and DTG methods. The kinetic equation may be expressed as: dα/dt=Ae−E/RT(1−α)2. The kinetic parameters (E, A), activation entropy ΔS # and activation free-energy ΔG # were also gained.

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Summary  

A new unsymmetrical Schiff base ligand (H2LLi) was synthesized using L-lysine, o-vanillin and salicylaladyde. Thorium(IV) complex of this ligand [Th(H2L)(NO3)](NO3)2 .3H2O have been prepared and characterized by elemental analyses, IR, UV and molar conductance. The thermal decomposition kinetics of the complex for the second stage was studied under non-isothermal condition by TG and DTG methods. The kinetic equation may be expressed as: dα/dt=A .e-E/RT.1/2 (1-α).[-ln(1-α)]-1. The kinetic parameters (E, A), activation entropy ΔS ¹ and activation free-energy ΔG ¹ were also calculated.

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Abstract  

The effect of additives (CuO, MnO2 and TiO2) on the thermal decomposition kinetics of potassium metaperiodate (KIO4) to potassium iodate (KIO3) has been studied in air by thermogravimetry under isothermal conditions. Irrespective of whether p- or n-type, the metal oxides show only a little or no influence on the rate of the decomposition except for the small decrease when the oxide concentration is as high as 10 wt%. The rate law for the decomposition of KIO4 (Prout–Tompkins model) remained unaffected by the additives.

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Abstract  

Four complexes of rare earth bromides with amino acids, REBr3·3L·3H2O (RE=La, Nd;L=glycine or alanine) were prepared and characterized by means of chemical analysis, elemental analysis, molar conductivity, thermogravimetry, IR spectra and X-ray diffraction. Their thermal decomposition kinetics from ambient temperature to 500°C were studied by means of TG-DTG techniques under non-isothermal conditions. The kinetic parameters (activation energyE and pre-exponential constantA) and the most probable mechanisms of thermal decomposition were obtained by using combined differential and integral methods. The thermal decomposition processes of these complexes are distinguished as being of two different types, depending mainly on the nature of the amino acid.

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Abstract  

Copper(II), zinc(II) and cadmium(II) complexes of the Schiff base, fluorenone anthranilic acid were prepared and characterized by elemental analysis, magnetic measurements, conductivity experiments and electronic and infrared spectral studies. The thermal decomposition kinetics and mechanism of these chelates was studied from TG data.

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