TY - JOUR
AU - Ugolkov,  Valery
AB - The assumption that potassium permanganate may serve as a kinetics standard in solid decomposition kinetics made a priori on the basis of the mechanism of the congruent dissociative vaporization of KMnO 4 and its crystal structure was successfully supported experimentally. As expected, the decomposition rate of KMnO 4 does not depend on the kind of foreign gas (He, air, CO 2 and Ar) and on the measurement technique (isothermal or dynamic). Other requirements for KMnO 4 as an ideal kinetics standard are satisfied as well. The use of the third-law method for determining the molar enthalpy of a reaction provides an excellent reproducibility of results. The mean value of from 12 experiments in different gases is 138.3 ± 0.6 kJ mol −1 , which coincides with the value of 138.1 kJ mol −1 calculated from the isothermal measurements in different gases by the second-law method. As predicted by theory, the random errors of the second-law and Arrhenius plot methods are 10–20 times greater. In addition, the use of these methods in the case of dynamic measurements is related to large systematic errors caused by an inaccurate selection of the geometrical (contraction) model. The third-law method is practically free of these errors.
TI - Decomposition of KMnO 4 in different gases as a potential kinetics standard in thermal analysis
JO - Journal of Thermal Analysis and Calorimetry
DO - 10.1007/s10973-009-0143-z
DA - 2010-04-01
UR - https://www.deepdyve.com/lp/springer-journals/decomposition-of-kmno-4-in-different-gases-as-a-potential-kinetics-r9yV21O2WI
SP - 145
EP - 153
VL - 100
IS - 1
DP - DeepDyve
ER -