The thermal behaviour of intimate mixtures of different mole ratios of potassium bromate and chromium(III) oxide has been studied using TG and DTA techniques in static air atmosphere. The products have been characterised by chemical analysis, infrared spectroscopy and X-ray diffraction studies. The studies indicate that Cr2O3 lowers the decomposition temperature of potassium bromate and is oxidised to Cr(VI). Each mole of Cr(III) takes up two moles of KBrO3, to give potassium dichromate, and four moles of KBrO3, to form potassium chromate. © 1994.

M. Ramakrishna Udupa

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Thermochimica Acta

The TG and DTA techniques in static air atmosphere have been employed to study the thermal behaviour of intimate mixtures comprising different mole ratios of potassium oxalate, potassium bromate and chromium(III) oxide. The products are characterised by chemical analysis, infrared spectroscopy and X-ray diffraction studies. The studies indicate that the onset of the reaction occurs after the dehydration of potassium oxalate around 200°C. Also it suggests that the chromium(III) oxide initiates the decomposition of potassium bromate at a lower temperature resulting in the liberation of oxygen which is utilised in the oxidative decomposition of potassium oxalate. With the stoichiometric amounts (3:3:1 molar ratio) of potassium bromate, potassium oxalate and chromium(III) oxide the reaction gives rise to a mixture of potassium chromate, potassium carbonate and potassium bromide in the molar ratio of 2:2:1. © 1995.

Solid state reactions in the system oxalate-bromate-chromium(III) oxide

Investigation on the influence of MoO3 and WO3 on the thermal decomposition of the halogen oxysalts, KClO4, KClO3, KBrO3 and KIO3 has been followed by TG, DTA, IR spectroscopy and X-ray diffraction studies. The results suggest the formation of mono-, di-, tri- and tetra- molybdates/tungstates in solid state by the reaction of appropriate mole ratios of the reactants. © 1988.

Thermochemical investigation of solid state reactions in molybdates/tungstates system

A study of the thermal decomposition of intimate mixtures of sodium chlorate and chromium(III) oxide in different molar ratios was made employing thermogravimetry, differential thermal analysis, chemical analysis, infrared spectroscopy and X-ray diffraction analysis. Sodium chlorate in the presence of chromium(III) oxide starts to decompose around 180°, which is much below the decomposition temperature of pure NaClO3. Each mole of Cr2O3 consumes 8/3 moles of NaClO3, undergoing oxidation to sodium dichromate. © 1981 Heyden &amp; Son Ltd., London and Akadémiai Kiadó, Budapest.

Journal	Thermochimica Acta
ISSN	00406031
Open Access	No