Annuaire
Pr. Tom BAKER
| Quand ? |
09/10/2014 à 13:30 |
|---|---|
| Où ? |
Grande Salle CBP LR6 |
| Contact |
Carine MICHEL |
Iron Catalysts for Selective Dehydrogenation of B-N Compounds
The high storage capacity of B-N compounds, along with their protic N-H and hydridic B-H hydrogens, make them promising materials for chemical hydrogen storage.1 In one application we show that the selectivity (and mechanism) of H2 release from ammonia-borane can be switched from insoluble poly(aminoborane) formation (1 equiv. H2) to production of B-N cross-linked borazine (> 2 equiv. H2) by protonation of the cis-FeH2(dmpe)2 catalyst precursor [dmpe = 1,2-bis(dimethylphosphino)ethane]. The catalyst resting state for the latter is shown to be [cis-Fe(k2-BH4)(dmpe)2]+. In a second application, first row transition metal nanoparticles, M0, are employed as catalysts for the low temperature H2 release from pure metal borohydride ammoniates, M’(BH4)m(NH3)n. Hydrogen purity dependence on the Lewis acidity and redox properties of M (Y, La, Zn) and the nature of M0 (Fe, Ni, Co, Cu) will also be presented.
1 Hamilton, C.W.; Baker, R. T.; Staubitz, A.; Manners, I. Chem. Soc. Rev., 2009, 38, 279-293.