Catalytic effect of halide additives ball milled with magnesium hydride

The effects of halide modifiers on the sorption kinetics of the Li-Mg-N-H System

“…Raman spectra of the as-milled indicates the presence of unreacted LiNH 2 after milling. The vibrational bands observed at 3262 cm -1 (N-H symmetric stretch) and 3323 cm -1 (unresolved N-H asymmetric stretch doublet) match literature spectra of the pure material [11,23]. Weak low-frequency (<500 cm -1 ) bands associated with lattice translational and librational modes are not visible, most likely due to low measurement sensitivity against a large scattering background.…”

“…(6) Transition metals have been shown to significantly improve kinetics and reduction of dehydrogenation temperatures in many hydrogen storage systems, including NaAlH 4 [4][5][6][7][8], MgH 2 [9][10][11][12], the 1:1 MgH 2 :LiNH 2 [2,13] and 2:1 LiNH 2 :MgH 2 [14]. Through the electronic structure and total energy calculation using first principle calculations on the effect of titanium on MgH 2 , Song et al found that the bond between magnesium and hydrogen was weakened [15].…”

NbCl5 and CrCl3 catalysts effect on synthesis and hydrogen storage performance of Mg–Ni–NiO composites

“…Combined with XRD patterns seen in figure 2, it can be stated that CrCl 3 doping can promote reduction of the onset of dehydrogenation temperature under the 0·1 MPa pressure. Transition metal halide can decline the onset of dehydrogenation temperature of Mg (Jin et al 2007;Malka et al 2010).…”

Hydrogen desorption kinetics of MgH2 synthesized from modified waste magnesium

“…Therefore several methods have been applied to overcome these issues. Especially, reduction of particle-grain size and addition of a catalyst resulted in the improvement of the surface properties and sorption kinetics of MgH 2 [3][4][5][6][7][8][9][10]. Chemical modification and composite with graphite were also applied [11][12][13][14][15][16][17].…”