Numerical modeling of hydrogen absorption measurements in Ni-catalyzed Mg

• We studied hydrogen absorption in Mg in a wide range of temperatures and pressures.
• We proposed a model and calculated the activation energy of the reaction.
• The model reproduced accurately the absorption kinetics.
• The thermal behavior of the system was simulated successfully.
• The system presents significant temperature spikes.

Magnesium has been deeply studied as a possible hydrogen storage material for both, mobile and static applications. In this work, hydrogen absorption in Ni-catalyzed magnesium was measured in a wide range of pressure (500 kPa–5000 kPa) and temperature (498 K–573 K). Using this information, a model for the absorption kinetics and thermal behavior of the hydrogen storage system was proposed. This model could be used in the design of Ni-catalyzed magnesium storage tanks and other applications. It considers the independent contribution of three variables: temperature, pressure and reacted fraction to estimate the hydrogen absorption rate. An activation energy for the process was estimated and the value obtained (92 kJ/mol) was concordant with previous values reported in the literature.

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