Abstract
Mixtures of LiAlH4/FeCl2 and LiBH4/FeCl2 were produced in several conditions of stoichiometry, time, and vial-oscillation frequency at cryogenic conditions (−196 °C) by ball milling. The best production conditions were milling for 30 min at −196 °C and 15 Hz of the oscillation frequency of the vial. Temperature-programmed desorption and differential scanning calorimetry experiments indicated that hydrogen release in LiAlH4/FeCl2 mixtures begins at approximately 60 °C and ends at 160 °C. Meanwhile, the LiBH4/FeCl2 mixtures presented dehydrogenation on-set at 40 °C, finishing at about 300 °C. These materials behave as reactive mixtures, where the LiCl formation is considered the driving force of the decomposition reactions. Cryogenic ball-milling has a good effect on the production of the mixtures and low-temperature dehydrogenation of the studied samples.
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