Abstract
The development of materials for hydrogen thermal compression should follow minimalistic and ecological aspects including low energy consumption, low-cost unitary operation production and low waste generation. These concepts are applied in this work by applying models previous to measurements in devices. The results include the application of a quantitative model to measurements of hydrogen sorption properties of an intermetallic of composition MmNi4,25Al0,75, synthesized by low energy reactive milling. The intermetallic was annealed in Ar at 600°C for 24h to improve the microstructural properties. The samples were analyzed in a Sievert's-type device. Curves of pressure vs. composition were previously obtained in a temperature range between 25°C and 100°C. A modeling of PCT curves was done. Two different stages were analyzed. The parameters involved in the model correspond to thermodynamic properties ΔHf y ΔSf of hydride formation. These results are used in the design of a one-stage hydrogen thermal compressor.
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