Effects of dopants on the isothermal decomposition kinetics of potassium metaperiodate

The isothermal decomposition of potassium metaperiodate (KIO4) has been stu died as a function of concentration of the dopants chloride, sulphate and b arium, by thermogravimetry (TG) in the temperature range 560-580 K. The dec omposition data for both pun and doped KIO4 were found to be best described by the Prout-Tompkins (PT) equation. As the dopant concentration increases . the rate of decomposition remains unaffected with chloride, increases app roximately linearly with sulphate and passes through a maximum with barium. However, doping did not change the activation energy of the reaction. The results favour an electron-transfer mechanism for the decomposition. (C) 20 00 Elsevier Science B.V. All rights reserved.