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

Thermal behaviour of potassium perchlorate and potassium chlorate in presence of chromium(VI) oxide

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 thermal behaviour of intimate mixtures of different molar ratios of potassium chlorate and chromium(III) oxide, and potassium chlorate and nickel(II) chromite(III) was made by employing thermogravimetry, differential thermal analysis, chemical analysis, infrared spectroscopy and X-ray powder diffraction analysis. Potassium chlorate in presence of Cr(III), starts decomposing around 200°C which is much below the decomposition temperature of pure KClO3. Each mole of Cr(III) takes up 8/3 moles of KClO3 to become oxidized into potassium dichromate. © 1975.

Thermal decomposition of potassium chlorate in presence of chromium(III) oxide and nickel(II) chromite(III)

A study of the thermal decomposition of intimate mixtures of different molar ratios of potassium perchlorate and chromium(III) oxide, and potassium perchlorate and nickel(II) chromite(III) was conducted employing thermogravimetry, differential thermal analysis, chemical analysis, infrared spectroscopy and X-ray diffraction analysis. Upon heating to 400°C Cr(III), in 2:1 molar ratios, is oxidized to potassium dichromate. Only a stoichiometric amount of Cr(III) was oxidized from molar ratios less than 2:1, leaving behind excess Cr2O3 and NiCr2O4 whereas from molar ratios greater than 2:1, Cr(III) was completely oxidized and the excess KClO4 started decomposing around 410°C which is much below the decomposition temperature of pure KClO4. © 1975.

Journal	Thermochimica Acta
ISSN	00406031
Open Access	No