Abstract
LiBH4 that has been ball-milled with different additives and subsequently mixed with mesoporous silica-gel has been investigated using thermal desorption spectroscopy and thermogravimetry. Mixtures of LiBH4 and mesoporous silica-gel (composition 50:50 wt %) release hydrogen at ∼260 °C. Samples, where LiBH4 was ball-milled prior to mixing with silica-gel with 5 mol % PdCl2, NiCl2, LaCl3 or TiCl3, have similar decomposition temperatures. Mass spectrometry data of the emitted gas streams show that almost all hydrogen desorption events are accompanied by the evolution of gaseous diborane, B2H6. The relative diborane concentration above 350 °C is considerably lowered by LaCl3 and TiCl3, whereas the other additives investigated have little influence on the amount of released diborane.
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