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Concentration-dependent dehydrogenation of ammonia-borane/triglyme mixtures

: Kostka, J.F.; Schellenberg, R.; Baitalow, F.; Smolinka, T.; Mertens, F.


European journal of inorganic chemistry (2012), Nr.1, S.49-54
ISSN: 1434-1948
ISSN: 1099-0682
Fraunhofer ISE ()

The dehydrogenation reaction of the hydrogen-storage compound ammonia-borane (AB) dissolved in triglyme (TG) reveals an unexpected but favourable concentration dependence of its dehydrogenation behaviour. Formal reaction-order considerations and 11B NMR spectroscopic analytics point towards a complex AB decomposition and hydrogen-release scheme that in highly concentrated solutions partly begins to resemble that of the solid-state case. The analysis of the gas-release characteristics identified two hydrogen desorption events that display an increasing peak overlap with increasing initial AB concentration. 11B NMR spectroscopic studies indicate that the concentration-dependent stability of the intermediate diammoniate of diborane, the presence of which appears to influence the rates of several dehydrogenation steps by interacting with various other intermediates, is one of the key factors for the overall hydrogen release.