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Abstract  

Thermal decomposition of potassium chlorate in the presence of various additives is studied using thermogravimetric analysis and differential thermal analysis. Catalytic effects of metal oxides with comparable surface areas are compared, and the catalytic effects of a number of nonoxide additives are also studied. The nonoxide additives show catalytic activities similar to the corresponding metal oxides. Metal cations and their electron configurations determine the catalytic activity of various compounds. Metal cations with partially filledd shells have the highest activity, transition metal cations with completely emptyd orbitals are moderated active, and metal cations with completely filledd shells or noble gas configurations have minimum activity.

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Abstract  

Thermogravimetry (TG) and differential thermal analysis (DTA) in the non-isothermal mode have been used to examine the thermal behaviour of the micron sized aluminum (Al) powder/potassium chlorate pyrotechnic systems in air, in relation to the behaviour of the individual constituents. The effects of different parameters of Al powder, such as particle size and its content in the mixtures, on their thermal property were investigated. The results showed that, the reactivity of Al powder in air increases as the particle size decreases. Also, it was found that neat Al with 5 m particle sizes (Al5) has a fusion temperature of about 647C, that for 18 m powder (Al18) is 660C. Pure potassium chlorate has a fusion temperature around 356C and decomposes at 472C. DTA curves for Al5/KClO3 (30:70) mixture showed a maximum peak temperature for the ignition of mixture at 485C. Also, by increasing the particle size of Al powder, the ignition temperature of the mixture increased. On the other hand, the oxidation temperature increased by enhancing the Al content of the mixtures. In this particular study, we observed that the width of reaction peak for the mixtures corresponds to their Al contents of samples.

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Abstract  

The thermal decomposition of -irradiated KClO3 was studied by dynamic thermogravimetry. The reaction order, activation energy, frequency factor and entropy of activation were computed using the Coats-Redfern, Freeman-Carroll and Horowitz-Metzger methods and were compared with those of the unirradiated salt. The decomposition increases with the irradiation dose. The energy of activation decreases on irradiation. The mechanism for the decomposition of unirradiated and irradiated KClO3 follows the Avrami model equation, 1-(1-)1/3, and the rate controlling process is a phase boundary reaction assuming spherical symmetry.

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Abstract  

The determination of thallium with potassium chlorate is chosen as an example for the earlier suggested new radio-oxidimetric titration procedure, in which phase separation is achieved by means of a strongly basic anion exchanger in the solution. Concentrations of thallium down to 2·10−6 M have been determined. Special care has to be taken for concentrations lower than 10−5 M as UV radiation is a disturbing factor. Other oxidizing agents have also been tested.

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The catalytic effects of metal oxides on thermal decomposition reactions, III

The influence of structural and electronic defects in iron oxides on their catalytic effectiveness with respect to the thermal decomposition of potassium chlorate

Journal of Thermal Analysis and Calorimetry
Authors: W. K. Rudloff and E. S. Freeman

The catalytic activity of a series of iron oxides on the thermal decomposition of potassium chlorate was investigated by methods of thermal analysis. Structural and electronic defects were introduced into the oxide by doping, heat treatment in different atmospheres, and irradiation withγ-rays. These induced defects changed in a systematic way the conductive properties of the iron oxides and correspondingly, their catalytic activity. The results are consistent with ann-type semiconductive behavior of the oxides.

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signal friendly forces and to mark positions. These are made of an oxidizer, frequently potassium chlorate, a fuel such as lactose, and an organic dye such as 1,4-dihydroxy anthraquinone (orange), 1-( p -tolylamino)-4-hydroxy anthraquinone (violet), 1

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Kinetic investigation on thermal decomposition of organophosphorous compounds

N,N-dimethyl-N′,N′-diphenylphosphorodihydrazidic and diphenyl amidophosphate

Journal of Thermal Analysis and Calorimetry
Authors: M. Sovizi and K. Anbaz

Hajimirsadeghi SS . Thermal decomposition of pyrotechnic mixtures containing sucrose with either potassium chlorate or potassium perchlorate . Combust Flame. 2005 ; 141 : 322 http://dx.doi.org/10.1016/j.combustflame.2005

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Journal of Thermal Analysis and Calorimetry
Authors: Seied Mahdi Pourmortazavi, Mehdi Rahimi-Nasrabadi, Iraj Kohsari, and Seiedeh Somayyeh Hajimirsadeghi

. Hosseini , SG , Pourmortazavi , SM , Hajimirsadeghi , SS . 2005 . Thermal decomposition of pyrotechnic mixtures containing sucrose with either potassium chlorate or potassium perchlorate . Combust Flame . 141 : 322 – 326 10.1016/j.combustflame.2005

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. 3. Hosseini , SG , Pourmortazavi , SM , Hajimirsadeghi , SS 2005 Thermal decomposition of pyrotechnic mixtures containing sucrose with either potassium chlorate or potassium perchlorate . Combust Flame 141 : 322 – 326

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