Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.348074
Title: The mechanism of the antimony/potassium permanganate combustion reaction
Author: Moghaddam, A. Z.
Awarding Body: Polytechnic of Wales
Current Institution: University of South Wales
Date of Award: 1984
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Abstract:
Results of a detailed thermoanalytical study of the reactions in the antimony/potassium permanganate system, which has been in use for many years as a delay composition, are presented. The starting points for such a study were the investigation of the thermal decomposition of KMn04, and the oxidation characteristics of the antimony as well as the thermal analysis of the oxides of antimony. Thermal decomposition of freshly prepared crystals and finely powdered KMnO4 were studied utilising thermogravimetry, differentia scanning calorimetry and hot stage microsocopy techniques, under atmospheres of air, nitrogen and argon. Data obtained from both TG and DSC analysis were used to measure the non-isothermal decomposition kinetics of KMnO 4- The activation energy was calculated applying a number of different methods, and the results were compared with the isothermal evaluation of activation energy. The decomposition of single crystals of KMn04 was observed under a hot-stage microscope with a particular interest in the fragmentation process, and the mechanism of the decomposition reaction is discussed. The gas-solid oxidation of antimony in air was carried out by both DSC and TG methods. The results revealed a two stage oxidation process corresponding to the surface and bulk oxidation of antimony particles. The reactions of the Sb/KMnO4 systems were investigated extensively in pelleted form as well as in powdered form by the thermoanalytical methods. The ignition reaction, 9 of Sb/KMn 04 mixtures were observed by a microscope as the temperature of the sample increased rapidly. The effect of atmosphere on the occurrence of the ignition reaction was t4sted. On the basis of the results obtained from thermal analysis and the studies of the mixtures in compacted form, conclusions on the mechanisms of the main propagation reaction were drawn.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.348074  DOI: Not available
Keywords: Chemical engineering Chemical engineering
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