Isothermal decomposition of isothiocyanatopentaamine cobalt(III) perchlorate. Particle size effect.
About: This article is published in Analytical Chemistry.The article was published on 1972-09-01. It has received 10 citations till now. The article focuses on the topics: Perchlorate & Cobalt.
Citations
More filters
TL;DR: In this paper, the effect of gamma ray irradiation on the rate and kinetics of thermal decomposition of potassium iodate (KIO3) has been studied by thermogravimetry (TG) under non-isothermal conditions at different heating rates (3, 5, 7, and 10 Kmin−1).
Abstract: The effect of gamma ray irradiation on the rate and kinetics of thermal decomposition of potassium iodate (KIO3) has been studied by thermogravimetry (TG) under non-isothermal conditions at different heating rates (3, 5, 7, and 10 K min−1). The thermal decomposition data were analyzed using isoconversional methods of Flynn–Wall–Ozawa, Kissinger–Akahira–Sunose, and Friedman. Irradiation with gamma rays increases the rate of the decomposition and is dependent on the irradiation dose. The activation energy decreases on irradiation. The enhancement of the rate of the thermal decomposition of KIO3 upon irradiation is due to the combined effect of the production of displacements and extended lattice defects and chemical damage in KIO3. Non-isothermal model fitting method of analysis showed that the thermal decomposition of irradiated KIO3 is best described by the contracting sphere model equation, with an activation energy value of ~340 kJ mol−1.
31 citations
Cites background from "Isothermal decomposition of isothio..."
...Chou and Olsen [ 39 ] found an unusual dependence of rate on particle size in the thermal decomposition of isothiocynatopentaammine cobalt(III) perchlorate....
[...]
17 citations
TL;DR: In this article, the thermal decomposition of KBrO3 has been studied as a function of particle size, in the range 53-150 lm, by isothermal thermogravi-metry at different temperatures, viz. 668, 673, 678, and 683 K in static air atmosphere.
Abstract: The thermal decomposition of potassium bro- mate (KBrO3) has been studied as a function of particle size, in the range 53-150 lm, by isothermal thermogravi- metry at different temperatures, viz. 668, 673, 678, and 683 K in static air atmosphere. The theoretical and experimental mass loss data are in good agreement for the thermal decomposition of all samples of KBrO3 at all temperatures studied. The isothermal decomposition of all samples of KBrO3 was subjected to both model fitting and model-free (isoconversional) kinetic methods of analysis. Isothermal model fitting analysis shows that the thermal decomposition kinetics of all the samples of KBrO3 studied can be best described by the contracting square equation. Contrary to the expected increase in rate followed by a decrease with decrease in particle size, KBrO3 shows a regular increase in rate with reduction in particle size, which, we suggest, is an impact of melting of this solid during decomposition.
12 citations
Cites background from "Isothermal decomposition of isothio..."
...Chou and Olsen [62] found an unusual dependence of rate on particle size in the thermal decomposition of isothiocynatopentaammine cobalt(III) perchlorate....
[...]
TL;DR: In this article, the kinetics of isothermal decomposition of urea nitrate, an organic secondary explosive with monoclinic structure and chemical formula CO(NH 2 ) 2 · HNO 3, was studied in open air in the temperature range 106-150°C, using a gravimetric method.
11 citations
10 citations
References
More filters
TL;DR: In this article, the thermal decomposition of ammonium perchlorate in vacuo and under small initial pressures of nitrogen, to suppress sublimation, has been investigated in the temperature ranges 220 to 280°C and 380 to 450°C.
Abstract: The thermal decomposition of ammonium perchlorate in vacuo and under small initial pressures of nitrogen, to suppress sublimation, has been investigated in the temperature ranges 220 to 280°C and 380 to 450°C. The experimental techniques for following the decomposition and subsequent analysis of the products are described and gas analysis results given. In the low -temperature range only 30% decomposition occurred though the ‘residue’ was still ammonium perchlorate. In vacuo sublimation occurred all the time and also after decomposition had ceased which indicated that the reaction was not in the vapour phase. Some of the properties of the sublimed material and the ‘residue’ were investigated; in particular, it was found that the residue which was porous in texture (the decomposition had occurred throughout the crystal) could be ‘rejuvenated’ by exposure to a solvent vapour. The crystal transformation at 240°C from orthorhombic to cubic, the addition of impurities which might be intermediate decomposition products, and the addition of some metallic oxide catalysts, were also investigated.
135 citations