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Mechanistic Studies of Hydrogen Release from Solid Amine Borane Materials

  • Mark Bowden (a1), Tim Kemmitt (a2), Wendy Shaw (a3), Nancy Hess (a4), John Linehan (a5), Maciej Gutowski (a6), Benjamin Schmid (a7) and Tom Autrey (a8)...

Abstract

Ammonia borane (NH3BH3) is a molecular solid with a high volumetric and gravimetric density of hydrogen. We report room temperature structural data which shows how the freely rotating NH3 and BH3 groups allow a N-H…H-B dihydrogen bond in which hydrogen atoms on adjacent molecules are separated by only 1.90Å. The initial decomposition of ammonia borane at 80-100°C into (NH2BH2)n and H2 has been studied by in-situ nmr spectroscopy and kinetic studies using isotopic substitution. The reaction proceeds by a bimolecular pathway involving a [NH3BH2NH3]+BH4 intermediate with an activation energy of 136kJmol−1.

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Mechanistic Studies of Hydrogen Release from Solid Amine Borane Materials

  • Mark Bowden (a1), Tim Kemmitt (a2), Wendy Shaw (a3), Nancy Hess (a4), John Linehan (a5), Maciej Gutowski (a6), Benjamin Schmid (a7) and Tom Autrey (a8)...

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