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

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% H 2 . The charging/discharging characte...

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Bibliographic Details
Published in:Chemical engineering communications 2013-05, Vol.200 (5), p.718-730
Main Authors: Bambhaniya, K. G., Grewal, G. S., Shrinet, V., Govindan, T. P., Singh, N. L.
Format: Article
Language:English
Subjects:
Absorption
Alloys
Catalytic synthesis
Charging
Chemical reactions
Diffusion
Discharge
Entropy
Hydrogen
Hydrogen storage
Kinetics
Magnesium base alloys
Mathematical models
Moles
Reaction kinetics
Thermodynamics
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Summary: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% H 2 . 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.
ISSN:0098-6445
1563-5201
DOI:10.1080/00986445.2012.662661