On the dehydrogenation of LiAlH4 enhanced by Ti salts and cryogenic ball-milling

Several mixtures of LiAlH4 and Ti salts (TiH2, TiF3, and TiCl4) were produced using short milling times and cryogenic (liquid nitrogen) cooling. The stoichiometric (2:1) and 5 mol% mixtures LiAlH4/TiH(2 )demonstrated minor improvements on the dehydrogenation temperature of LiAlH4. Conversely, an enhancement of the dehydrogenation reaction was observed in the LiAlH4 added with 5 mol% of TiCl4 and in the stoichiometric mixture 3LiAlH(4) + TiF3. In these mixtures, an important reduction of the dehydrogenation temperature was observed (37 degrees C and 55 degrees C on-set temperature, respectively). This improvement was promoted by the use of cryogenic ball milling and careful control of the energy added to the mixtures during ball milling. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.