Mechanical and thermal decomposition of LiAlH4LiAlH4 with metal halides

NiFe2O4 Nanoparticles Catalytic Effects of Improving LiAlH4 Dehydrogenation Properties

“…Moreover, the initial desorption temperature of LiAlH 4 remarkably decreased to 58°C by doping 5 mol % NiFe 2 O 4 nanopowders, which is quite lower than that of LiAlH 4 with the addition of other various previously reported catalysts. 4,5,[17][18][19][20]24,26,30,31 Meanwhile, combining these two considerations from the initial dehydrogenation temperature and hydrogen release capability, the optimal content of NiFe 2 O 4 additive of the doped sample with the best dehydrogenation performance is 3 mol %, and the LiAlH 4 +3 mol % NiFe 2 O 4 sample will be utilized for analyzing the catalytic effect and mechanism of NiFe 2 O 4 in the following tests. Although NiFe 2 O 4 nanopowder has exhibited superior catalytic performance by declining the onset dehydrogenation temperature of LiAlH 4 , the reversibility of the completely dehydrogenated 3 mol % doped sample cannot be tested at 140°C under 6.5 MPa hydrogen pressure, as shown in Figure S1 (Supporting Information), resulting from the thermodynamic properties of LiAlH 4 .…”

Metastable Metal Hydrides for Hydrogen Storage

“…A more substantial decrease in desorption temperature was achieved with the addition of a few mole percent of TiC (shown in Figure 8), which lowered the activation energy to 86 kJ/mol [105]. Further reductions in the desorption temperature were recently demonstrated with the addition of 1 mol% NbF 5 , which lowered the activation energy to 67 kJ/mol [102], and nanoscale iron particles, which reduced the activation energy to 55-60 kJ/mol [80]. Similar to LiAlH 4 , the hydrogen evolution rates from AlH 3 are rapid at low temperature.…”

“…Over the past 10 years there has been considerable interest in identifying catalysts to enhance the low temperature desorption rates and/or decrease the desorption temperature. A significant reduction in decomposition temperature has been achieved using a variety of additives including TiF 3 [98], TiCl 3 [99], TiCl 3 · 1/3AlCl 3 [100,101], VCl 3 [99,102] [105], nanoscale Fe and Ni [80,106], TiC [100], and carbon fibers [107]. As an example we can compare the activation energy for the first decomposition step (3LiAlH 4 → Li 3 AlH 6 + 2Al + 3H 2 ), which is typically around 102 kJ/mol for the uncatalyzed material [99,105].…”

Hydrogen purification methods

“…There are several works related to this group of elements (Ares-Fernandez et al, 2007;Bogdanovic, Brand, Marjanovic, Schwickardi, & T€ olle, 2000;Gross, Sandrock, & Thomas, 2002;Ismail, Zhao, Yu, & Dou, 2010;Varin, Czujko, & Wronski, 2009;Varin & Zbroniec, 2012;Wang, Ebner, Zidan, & Ritter, 2005;Xiao et al, 2008). The hydrogen content reaches values of up to 18 wt% for LiBH 4 .…”