SYNTHESIS AND REACTION KINETICS OF A Mg-Fe-Mn-Ni ALLOY FOR HYDROGEN STORAGE

Author: Bambhaniya K. G.   Grewal G. S.   Shrinet V.   Govindan T. P.   Singh N. L.  

Publisher: Taylor & Francis Ltd

ISSN: 0098-6445

Source: Chemical Engineering Communications, Vol.200, Iss.5, 2013-05, pp. : 718-730

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Abstract

This article presents results of a characterization study undertaken on a Mg-Fe-Mn-Ni alloy for hydrogen storage application. This Mg-Fe-Mn-Ni alloy undergoes rapid activation in less than five charging/discharging runs and is able to reversibly uptake 5 mass% H2. The charging/discharging characteristics of this alloy are evaluated as a function of temperature. The optimal temperatures for hydriding and dehydriding are identified as 325.5°C and 372°C, respectively. The kinetics data are fitted to lumped first-order reaction models as well as to a spherically symmetric diffusion model with first-order kinetics. Based on the analysis, model constants are derived. Further, based on the van ‘t Hoff equation, the formation enthalpy and entropy are determined as 65 ± 3.1 kJ/mole and 101 ± 4.7 J/mole K, respectively.