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DPG

Berlin 2005 – scientific programme

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M: Metallphysik

M 4: Wasserstoff in Metallen

M 4.3: Talk

Friday, March 4, 2005, 11:00–11:15, TU H2038

Characterization of the dehydrogenation of alanates with different catalyst monitored by proton NMR — •Laura Esther Valiente-Banuet, Eva Stanik, and Günter Majer — Max-Planck-Institut für Metallforschung, Heisenbergstr. 3, 70569 Stuttgart

NaAlH4 is a promising material for the development of reversible hydrogen storage systems. The kind of pre-treatment of the material and the catalyst play a crucial role in the increase of the de- and re-hydriding rates. This also influences the reduction in the temperature of dehydrogenation. However, the microscopic mechanism and the change of the hydrogen mobility due to the catalyst are not yet completely understood. In this work we report on NMR studies of the hydrogen desorption from NaAlH4 doped with the catalysts TiCl3 and Ti13-clusters, respectively. The time dependence of the NMR spectra, measured at a given temperature, shows clearly the transition from NaAlH4 to Na3AlH6. The hydrogen dynamics in the different compounds is investigated by measurements of the spin-lattice relaxation. In the case of NaAlH4 a double-exponential recovery of the nuclear magnetization is observed, which indicates two fractions of hydrogen with different mobilities.

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