Thermal decomposition of LiAlH4 chemically mixed with Lithium amide and transition metal chlorides

Abstract: Thermogravimetric analysis of LiAlH4 chemically mixed with different additives is reported for the application of hydrogen storage. Here, we illustrated the dehydrogenation properties of combined LiAlH4/LiNH2 (2:1) mixture and LiAlH4 wet-doped with different transition metals (Sc, Ti, and V) in their chloride forms. Thermal gravimetric analysis of LiAlH4/LiNH2 system released ∼7.9wt.% of hydrogen in three decomposition steps at temperatures between 75 and 280°C under a heating ramp of 5°Cmin−1. The LiAlH4 doped with transition metals showed the decrease of decomposition temperature down to 30–40°C for both 1st and 2nd dehydrogenation steps as compared to as-received LiAlH4. The catalytic activity in lowering the dehydrogenation temperature of LiAlH4 doped with transition metals increases in the order of pure LiAlH4 <V<Ti<Sc. The X-ray diffraction analysis, field emission scanning electron microscopy, and Fourier transformation infra-red spectroscopy techniques were carried out in support of the thermogravimetric results. [Copyright &y& Elsevier]