TY - JOUR
T1 - Study of the decomposition of a 0.62LiBH4–0.38NaBH4 mixture
AU - Liu, Yinzhe
AU - Reed, Daniel
AU - Paterakis, Christos
AU - Contreras Vasquez, Luis
AU - Baricco, Marcello
AU - Book, David
PY - 2017/4/14
Y1 - 2017/4/14
N2 - This work highlights the dehydrogenation mechanisms of a 0.62LiBH4–0.38NaBH4 mixture in the range of 25–650 °C in flowing Ar. The dehydrogenation starts from 287 °C followed by two decomposition steps at 488 °C and 540 °C. These peak temperatures are in the range of 470 °C (for pure LiBH4)–580 °C (for pure NaBH4) due to different Pauling electronegativity values for Li+ (0.98) and Na+ (0.93) that affects the stability and decomposition temperatures. The 1st step of dehydrogenation is accompanied with precipitation of LiH, Li2B12H12 and B in between 287 and 520 °C; whilst the 2nd step of dehydrogenation is mainly accompanied by the precipitation of Na and B when temperature is higher than 520 °C. The total amount of H2 released is 10.8 wt.% that exceeds the estimated amount (8.9 wt.%), indicating less metal dodecaborate (than that for pure LiBH4) is formed during the decomposition.
AB - This work highlights the dehydrogenation mechanisms of a 0.62LiBH4–0.38NaBH4 mixture in the range of 25–650 °C in flowing Ar. The dehydrogenation starts from 287 °C followed by two decomposition steps at 488 °C and 540 °C. These peak temperatures are in the range of 470 °C (for pure LiBH4)–580 °C (for pure NaBH4) due to different Pauling electronegativity values for Li+ (0.98) and Na+ (0.93) that affects the stability and decomposition temperatures. The 1st step of dehydrogenation is accompanied with precipitation of LiH, Li2B12H12 and B in between 287 and 520 °C; whilst the 2nd step of dehydrogenation is mainly accompanied by the precipitation of Na and B when temperature is higher than 520 °C. The total amount of H2 released is 10.8 wt.% that exceeds the estimated amount (8.9 wt.%), indicating less metal dodecaborate (than that for pure LiBH4) is formed during the decomposition.
U2 - 10.1016/j.ijhydene.2017.03.141
DO - 10.1016/j.ijhydene.2017.03.141
M3 - Article
SN - 0360-3199
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
ER -