11:15 AM–1:39 PM, Wednesday, March 23, 2005
LACC - 403B
Sponsoring Unit:
FIAP
Chair: Frederick E. Pinkerton, GM Research and Development Center
Abstract ID: BAPS.2005.MAR.P14.9
1:15 PM–1:27 PM
Frederick E. Pinkerton
Gregory P. Meisner
Martin S. Meyer
Michael P. Balogh
(General Motors Research and Development Center)
Matthew Kundrat
(Aerotek Corp.)
We report thermogravimetric, volumetric, and calorimetric measurements of hydrogen desorption from the new quaternary hydride Li$_{3}$BN$_{2}$H$_{8}$ (11.9 wt{\%} theoretical hydrogen capacity). Li$_{3}$BN$_{2}$H$_{8}$ releases $\ge $10 wt{\%} hydrogen at temperatures above $\sim $250$^{\circ}$C. Simultaneous mass spectrometry residual gas analysis shows that a small amount of ammonia (2-3 mole{\%} of the generated gas) is released concurrently. Independent volumetric and gravimetric measurements are in excellent agreement regarding the quantities of hydrogen and ammonia released. Differential scanning calorimetery and in-situ x-ray diffraction show that Li$_{3}$BN$_{2}$H$_{8}$ melts at $\sim $190$^{\circ}$C, thus hydrogen evolution occurs from the molten state. It dehydrides to the solid product Li$_{3}$BN$_{2}$, and the evolved gas satisfactorily accounts for all of the available hydrogen content. Preliminary calorimetric measurements suggest that hydrogen release is exothermic, and, hence, not easily reversible; to date, rehydriding has not been achieved.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2005.MAR.P14.9