Effect of Additives on the Reversibility of Lithium Alanate (LiAlH4)

The effect of various catalysts, such as Ti, Ni, Fe, Ce(SO4)2 and LaCl3, on the reversibility of LiAlH4 was studied by Pressure-Content-Temperature (PCT) experiments. The result indicates that doping induces a marked decrease in the rate of hydrogen release. In addition, doping additives obviously decreases the initial temperature of LiAlH4 of hydrogen release except for doping with LaCl3. However, at the same time, the amount of hydrogen release also decreases. In the study on the hydrogen absorption of LiAlH4 doped with 1mol% Ni, 1mol% Ti, 1 mol% Ce(SO4)2 and 1mol%LaCl3 at 180 °C under about 8 MPa, it has been found that the sample doped with 1 mol% Ni presents the largest hydrogen absorption amount with about 0.97wt%.