Synthesis and thermal decomposition of potassium tetraamidoboranealuminate, K[Al(NH2BH3)4]
| Autor: | Yaroslav Filinchuk, Zbigniew Łodziana, Jacob G. Andreasen, Jørgen Skibsted, Torben R. Jensen, Kasper T. Møller, Mathias Jørgensen |
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| Rok vydání: | 2018 |
| Předmět: |
Metal amidoboranes
Materials science Hydrogen Potassium Energy Engineering and Power Technology Infrared spectroscopy chemistry.chemical_element 02 engineering and technology Crystal structure Triclinic crystal system 010402 general chemistry 01 natural sciences Thermal analysis Potassium alanate Renewable Energy Sustainability and the Environment Thermal decomposition Hydrogen storage 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Potassium tetraamidoboranealuminate Crystallography Fuel Technology Octahedron chemistry Ammonia borane 0210 nano-technology |
| Zdroj: | 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, vol. 43, no. 1, pp. 311-321 . https://doi.org/10.1016/j.ijhydene.2017.11.080 |
| ISSN: | 0360-3199 |
| Popis: | 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% H2. The decomposition products are investigated ex situ by powder X-ray diffraction, infrared spectroscopy, and 11B and 27Al 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 °C and p(H2) = 110 bar. |
| Databáze: | OpenAIRE |
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