Three Methods for Application of Data from a Volumetric Method to the Kissinger Equation to Obtain Activation Energy

Abstract

Thermal analysis methods have been used in many reports to determine the activation energy for hydride decomposition (dehydrogenation). In our preceding work, we showed that the dehydrogenation rate of Mg-5Ni samples obeyed the first-order law, and the Kissinger equation could thus be used to determine the activation energy. In the present work, we obtained the activation energy for dehydrogenation by applying data from a volumetric method to the Kissinger equation. The quantity of hydrogen released from hydrogenated Mg-5Ni samples and the temperature of the reactor were measured as a function of time at different heating rates (Φ) in a Sieverts-type volumetric apparatus. The values of dHd/dt, the dehydrogenation rate, were calculated as time elapsed and the temperature (Tm) with the highest dHd/dt was obtained. The values of dHd/dT, the rate of increase in released hydrogen quantity (Hd) to temperature (T) increase, were calculated according to time, and the temperature (Tm) with the highest dHd/dT was also obtained. In addition, the values of dT/dt, the rate of increase in temperature to time (t) increase, were calculated according to time, and the temperature (Tm) with the highest dHd/dt was obtained. Φ and Tm were then applied to the Kissinger equation to determine the activation energy for dehydrogenation of Mg-5Ni samples.

Thermal Hazard Analysis of Two Non-Ideal Explosives Based on Ammonium Perchlorate/Ammonium Nitrate and Aluminium Powder

“…As there are some new mathematical approximations, it seems that the Ozawa and Kissinger methods have not been so popular in the International Confederation for Thermal Analysis and Calorimetry (ICTAC) Kinetics Practices papers in recent years [ 36 , 37 , 38 ]. However, many researchers still perform thermokinetic parameter calculations employing the Ozawa and Kissinger methods due to the unique advantages of the two methods [ 39 , 40 , 41 , 42 , 43 , 44 , 45 ], which means that these two approximation methods are still reliable methods. Therefore, the authors adopt the Ozawa and Kissinger methods in this study to analyze the thermokinetic parameters such as activation energy (E) and pre-exponential factor (A).…”

The curing kinetics and properties of self-healing and thermally conductive polymeric composites based on ethylene vinyl acetate copolymer filled with nano alumina

“…By measuring the heat variation with temperature and time, the curing kinetics were characterized. The Kissinger method 33–35 was the most commonly used kinetic method for non-isothermal curing. Equation (1) could be obtained for different heating rates according to the Arrhenius formula:When the reaction reached the maximum rate temperature Tp, d (dα/dt) was 0, which was combined into equation (1) to obtain equation (2):Where x was the conversion rate since n (1-x p ) n −1 was independent of the heating rate β.…”

“…By measuring the heat variation with temperature and time, the curing kinetics were characterized. The Kissinger method [33][34][35] was the most commonly used kinetic method for non-isothermal curing. Equation (1) could be obtained for different heating rates according to the Arrhenius formula:…”

New Heterocyclic Organo-Chalcogenide Compounds: Synthesis, Physicochemical Characterization, and Evaluation of Anticancer Activity against Breast Cancer Cells

“…These calculations are dependent on the peak temperature T s in order to get the highest rate of process Table 1. The negative value of ΔS * indicates that the decomposition reactions proceed spontaneously and indicates that the activated ligands have more ordered structures than the reactants [29]. The thermal decomposition process of some of these ligands has one decomposition temperature (7a), while the others have two (8d, 6d) or three (6a) decomposition temperatures (Fig.…”