Related Experiment Video
Updated: Mar 4, 2026

Supercritical Nitrogen Processing for the Purification of Reactive Porous Materials
Published on: May 15, 2015
Effects of Stoichiometry on the H2 -Storage Properties of Mg(NH2 )2 -LiH-LiBH4 Tri-Component Systems
Han Wang1,2, Hujun Cao3, Claudio Pistidda3
1Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics Department, Chinese Academy of Sciences, Dalian, 116023, P. R. China.
Abstract:
The hydrogen desorption pathways and storage properties of 2 Mg(NH2 )2 -3 LiH-xLiBH4 samples (x=0, 1, 2, and 4) were investigated systematically by a combination of pressure composition isotherm (PCI), differential scanning calorimetric (DSC), and volumetric release methods. Experimental results showed that the desorption peak temperatures of 2 Mg(NH2 )2 -3 LiH-xLiBH4 samples were approximately 10-15 °C lower than that of 2 Mg(NH2 )2 -3 LiH. The 2 Mg(NH2 )2 -3 LiH-4 LiBH4 composite in particular began to release hydrogen at 90 °C, thereby exhibiting superior dehydrogenation performance. All of the LiBH4 -doped samples could be fully dehydrogenated and re-hydrogenated at a temperature of 143 °C. The high hydrogen pressure region (above 50 bar) of PCI curves for the LiBH4 -doped samples rose as the amount of LiBH4 increased. LiBH4 changed the desorption pathway of the 2 Mg(NH2 )2 -3 LiH sample under a hydrogen pressure of 50 bar, thereby resulting in the formation of MgNH and molten [LiNH2 -2 LiBH4 ]. That is different from the dehydrogenation pathway of 2 Mg(NH2 )2 -3 LiH sample without LiBH4 , which formed Li2 Mg2 N3 H3 and LiNH2 , as reported previously. In addition, the results of DSC analyses showed that the doped samples exhibited two independent endothermic events, which might be related to two different desorption pathways.
Related Concept Videos
Chemical Stoichiometry and Gases: Using Ideal Gas Law to Determine Moles
Reaction Stoichiometry
Reduction of Alkenes: Catalytic Hydrogenation
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
Lewis Structures of Molecular Compounds and Polyatomic Ions
Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation
Complexation Equilibria: Factors Influencing Stability of Complexes

