Abstract
We developed a method to determine the activation energy for hydride decomposition using a Sieverts-type apparatus and the Kissinger equation, not using thermal analysis methods. The quantity of hydrogen released from the sample and the temperature of the reactor were first measured as a function of time at different heating rates (Φ) in a Sieverts-type apparatus. The dehydriding rates were calculated according to time and the temperature Tm (at which the dehydriding rate was the highest). Φ and Tm were then applied to the Kissinger equation. The dehydriding rate of Mg-5Ni samples obeyed a first-order law, and the Kissinger equation could thus be used to determine the activation energy. On a heating rate of 3 K/min, the decomposition rate of hydride was the highest at 590.0 K. From a plot of ln (Φ/Tm2) versus 1/Tm, the obtained activation energy for hydride decomposition was 174 kJ/mole.
Highlights
Researchers are increasingly interested in hydrogen as a next-generation energy carrier.issues surrounding its storage and transportation first need to be addressed
To find the hydride decomposition temperature, the quantity of hydrogen released, and the heat involved in the hydride decomposition, thermal analysis methods—such as thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) analysis, differential thermal analysis (DTA), and thermal desorption spectroscopy (TDS) analysis—
We investigated the order of the dehydriding rate of hydrided Mg–5Ni; we showed that the dehydriding rate of the Mg-5Ni sample obeys a first-order law and that the Kissinger equation can be used to determine the activation energy for hydride decomposition of the hydrided Mg-5Ni
Summary
Researchers are increasingly interested in hydrogen as a next-generation energy carrier. We determined the activation energy for hydride decomposition using a Sieverts-type apparatus and the Kissinger equation This method is supposed to be useful without employing high-quality thermal analysis systems (calorimetric technique apparatuses with high- or ultra-high-vacuum performance and enabling samples to be reloaded without contact with atmosphere). We investigated the order of the dehydriding rate of hydrided Mg–5Ni; we showed that the dehydriding rate of the Mg-5Ni sample obeys a first-order law and that the Kissinger equation can be used to determine the activation energy for hydride decomposition of the hydrided Mg-5Ni. To determine the activation energy for hydride decomposition, the quantity of hydrogen released from the sample and the temperature of the reactor were first measured as a function of time at different heating rates (Φ) in a Sieverts-type apparatus. The Kissinger method is usually applied by using calorimetric techniques
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