Effect of alkali metal amides on the improvement of dehydrogenation for the LiH-NH system.

In this study, the hydrogen desorption properties for the reactions between 1 mol% MNH-added (M = Li, Na, and K) lithium hydride and NH (0.5 MPa, NH/LiH = 1 mol/mol) at 100 °C were systematically investigated to design a LiH-NH hydrogen storage system with better kinetic properties. It is found that all of the alkali metal amide additives can improve the hydrogen desorption kinetics of the LiH-NH system, among which, LiNH shows the best effect. As compared to the other LiNH-added composition, the 1 mol% LiNH-added composition shows the best effect on improving the desorption kinetics of the LiH-NH system. According to the kinetic analysis, it is proposed that the effect of LiNH on the hydrogen desorption kinetics would be mainly due to physical effect. [ABSTRACT FROM AUTHOR]