Özet:

Research on hydrogen storage alloys is offering actually a wide range of chemisorption-materials that can store or release safely interesting amount of hydrogen regarding classic pressurized or cryo-liquid container needing expensive and permanent maintenance procedure. In this context, rigorous hydrogenation experiment was elaborated on new AB3 compound LaMg2Ni5Al4 recently investigated as quaternary intermetallic material. X-ray diffraction analysis shows that two different pathways could be used from elementary metals or binary precursors to fulfil the desired crystal phase. Careful screening of the AB3 alloy thermal stability was carried out before hydrogenation. Differential thermal analysis DTA demonstrates that this compound can support heating flow up 800 °C without any degradation. Straight solid-gas hydrogenation process was controlled and acquired following meticulously the pressure. It was demonstrated that hydrogen sorption is following a first-order exponential Avrami model. Interestingly, the kinetic study illustrates that lower activation energy (a gap of 90 kJ.mol-1) is observed comparing the intermetallic from binary precursor. Results show also that this compound is prominent candidate serving stabilized solid-Hydrogen as bulk reservoir and hydrogen absorption measurement endorsed that bulk intermetallic hydride is achieved.

Anahtar Kelimeler: