Synthesis and thermal decomposition of potassium tetraamidoboranealuminate, K[Al(NH 2 BH 3 ) 4 ]
(2018) International Journal of Hydrogen Energy — Vol. 43, n° 1, p. 311-321 (2018)
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Møller, Kasper T. 
Andreasen, Jacob G. Jensen, Torben R.
- Abstract
- A new potassium tetraamidoboranealuminate, K[Al(NH2BH3)(4)], has been synthesized by a mechanochemical reaction between KAlH4 and NH3BH3. The compound, K[Al(NH2BH3)(4)], crystallizes in a triclinic unit cell with space group symmetry P-1. The crystal structure consists of [K(NH2BH3)(6)](5-)octahedra which facilitate the bridging between K+ in 1D chains, while also bridging K+ to Al3+ to connect the 1D chains in a 3D network. Thermal analysis reveals that K[Al(NH2BH3)(4)] decomposes in two exothermic steps at T-94 and 138 C and releases primarily hydrogen. The total gas release amounts to-6.0 wt% H-2. The decomposition products are investigated ex situ by powder X-ray diffraction, infrared spectroscopy, and B-11 and Al-27 NMR and identified as KBH4 and amorphous phases, possibly BN3, N2BH, and/or NBH2 whereas aluminum is found in four-, five-, and six-fold coordination. Unfortunately, the decomposed sample shows no hydrogen absorption at T = 260 degrees C and p(H-2) = 110 bar.
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Citations
Møller, K. T., Jørgensen, M., Andreasen, J. G., Skibsted, J., Łodziana, Z., Filinchuk, Y., & Jensen, T. R. (2018). Synthesis and thermal decomposition of potassium tetraamidoboranealuminate, K[Al(NH 2 BH 3 ) 4 ]. International Journal of Hydrogen Energy, 43(1), 311-321. https://doi.org/10.1016/j.ijhydene.2017.11.080 (Original work published 2018)