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The Effect of Storage-Induced Changes in Ammonia Borane on Hydrogen Release during Its Low-Temperature Thermolysis

1
Boreskov Institute of Catalysis SB RAS (BIC SB RAS), 630090 Novosibirsk, Russia
2
Department of Natural Sciences, Novosibirsk State University, 630090 Novosibirsk, Russia
*
Author to whom correspondence should be addressed.
Inorganics 2019, 7(8), 96; https://doi.org/10.3390/inorganics7080096
Received: 28 June 2019 / Revised: 19 July 2019 / Accepted: 1 August 2019 / Published: 4 August 2019
(This article belongs to the Section Inorganic Solid-State Chemistry)
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Abstract

In this paper, low-temperature solid-state processes of the dehydrogenation of ammonia borane (NH3BH3, AB) samples of different purity are compared under the conditions of isothermal heating at 100 °C, as well as in the course of thermal analysis which was also carried out at different rates of heating. The composition of boron-containing impurities was studied by attenuated total reflection Fourier transform infrared spectroscopy (ATR FTIR) and 11B magic angle spinning nuclear magnetic resonance (11B MAS NMR). Accumulation in AB of three- and four-coordinated borate anions upon contact of hydride with air moisture is established. The apparent activation energies were calculated from thermal analysis data, and found to decrease from 174 to 163 kJ/mol as the AB purity decreased from 93% to 79%. This showed itself in a shortening of the induction period during the AB thermolysis under isothermal conditions. The prospects of using the thermal analysis for estimating NH3BH3 reactivity are discussed. View Full-Text
Keywords: hydrogen storage; ammonia borane; purity; borates; thermolysis; Kissinger equation; activation energy hydrogen storage; ammonia borane; purity; borates; thermolysis; Kissinger equation; activation energy
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Komova, O.V.; Netskina, O.V.; Ozerova, A.M.; Odegova, G.V.; Arzumanov, S.S.; Simagina, V.I. The Effect of Storage-Induced Changes in Ammonia Borane on Hydrogen Release during Its Low-Temperature Thermolysis. Inorganics 2019, 7, 96.

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