Dehydrogenation of ammonia borane

Zhou, X., et ah, Deposition ofFe-Ni nanoparticles on polyethyleneimine-decoratedgraphene oxide and application in catalytic dehydrogenation of ammonia borane. Journal of Materials Chemistry, 2012. 22(27) p. 13506-13516. 

Scheme 8.4 Proposed mechanism for the metal catalyzed dehydrogenation of ammonia borane.

Scheme 8.5 Proposed mechanism for the acid-initiated dehydrogenation of ammonia borane in solution.

When the same reaction was carried out with the nickel analogue, complete decomposition to compound 43, in which one of the NHC rings had opened, took place (Scheme 3.15). ° A similar migratory insertion of a ligand on nickel to the NHC was proposed by Hall et al. based on computational studies of the dehydrogenation of ammonia borane by NHC-Ni-NHC based catalysts. 

TRANSITION METAL(O) NANOPARTICLES AS CATALYST IN THE DEHYDROGENATION OF AMMONIA BORANE... 

TABLE 7.4 Transition Metal Nanoparticles Catalysts Employed in Dehydrogenation of Ammonia Borane the Activity of Catalyst in Turnover Frequency (TOF)... 

Keaton, R. J. Blacquiere, J. M. Baker, R. T., Base metal catalyzed dehydrogenation of ammonia-borane for chemical hydrogen storage, J. Am. Chem. Soc. 2007,129, 1844-1845. 

Control of Shell Thickness of Hollow Silica-Alumina Composite Spheres and their Activity for Hydrolytic Dehydrogenation of Ammonia Borane... 

Control of shell thickness of hollow silica-alumina composite spheres and their activity for hydrolytic dehydrogenation of ammonia borane... 

We have already fabricated hollow silica-alumina composite spheres prepared by sol-gel based method using aqueous ammonia solution as a promoter of sol-gel reaction [4], and have revealed the influence of their nanostructure of the hollow spheres on their catalytic activity for hydrolysis of NH3BH3 [4], In the present study, we fabricated hollow silica-alumina composite spheres using PS template method and investigated their activity for hydrolytic dehydrogenation of ammonia borane. In addition, we firstly fabricated the hollow spheres using L(+)-arginine as the promoter for hydrolysis of tetraethoxysilane (TEOS) [16],... 

The results indicate that hollow structure plays important role to show high activity for hydrolytic dehydrogenation of ammonia borane due to shorter diffusion distance that the reactants for hydrolysis of ammonia borane access to the active sites or larger amount of active site on the hollow spheres compared with the amount on the spherical particles. 

Nitrogen-doped carbon composites have also been reported by Chen et al. [154] to be theoretically an efficient metal-free catalyst in the dehydrogenation of ammonia borane compounds. 

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