As the chemical hydrogen storage material, it must have a high hydrogen storage capacity. Ammonia borane (NH₃BH₃, AB), whose hydrogen content is as high as 19.6 wt%, is regarded as a potential hydrogen storage medium with the bright future. The capacity of AB hydrolysis dehydrogenation is up to 7.8 wt%. The capacity of AB pyrolysis dehydrogenation can release 19.6 wt% of hydrogen. Both the hydrolysis dehydrogenation and the pyrolysis dehydrogenation have shown its great potential in the chemical hydrogen storage. In the study of AB dehydrogenation, catalyst is the key technology and the important research direction. Among all the catalysts about AB dehydrogenation, nano metal catalysts have been investigated for their excellent performance. In this paper, the nano catalysts and their performance about the dehydrogenation of ammonia borane are reviewed.

Contents
1 Introduction
2 One-component nano metal catalysts
2.1 Nano rhodium catalysts
2.2 Nano palladium catalysts
2.3 Nano ruthenium catalysts
2.4 Nano nickel catalysts
2.5 Other nano metals catalysts
3 Two-components nano metal catalysts
3.1 The supported bimetal catalysts
3.2 The alloy bimetal catalysts
3.3 The core-shell bimetal catalysts
4 Three-components nano metal nanoparticles
5 Conclusions and outlook