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In relation to this article, we declare that there is no conflict of interest.
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Received August 27, 2018
Accepted November 25, 2018
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Reactive insights into the hydrogen production from ammonia borane facilitated by phosphonium based ionic liquid

Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati -781039, Assam, India 1Department of Chemical Engineering, Indian Institute of Science Education and Research Bhopal, Bhopal - 462 066, Madhya Pradesh, India
tamalb@iitg.ac.in
Korean Journal of Chemical Engineering, March 2019, 36(3), 456-467(12), 10.1007/s11814-018-0196-4
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Abstract

The current work presents a mechanistic insight of hydrogen production from ammonia borane (AB) facilitated by the phosphonium based ionic liquid (IL), trihexyl(tetradecyl)phosphonium bis (2,4,4-trimethylpentyl) phosphinate ([TDTHP][Phosph]). Prior to experiments, the IL was screened from a pool of 11 phosphonium ILs with the infinite dilution activity coefficients (IDAC) values as predicted by conductor like screening model segment activity coefficient (COSMO-SAC) theory. Thereafter, a dehydrogenation experiment of AB/[TDTHP][Phosph] was carried out at 105 °C and 4 x10-2mbar of gauge pressure, which yielded 2.07 equivalent hydrogen production. At higher temperature, the 11B NMR characterization shows the suppression of induction period at 105 °C and appearance of borohydride anion after 1 min of dehydrogenation. Further, time-resolved characterization of AB/[TDTHP][Phosph] at 105 °C confirmed the appearance of polymeric aminoborane after 10min with a subsequent formation of polyborazylene. HR-MS characterization coupled with 1H resonance spectrum confirmed structural integrity of IL. The dual characterization of NMR and HR-MS led us to propose a dehydrogenation mechanism of AB/[TDTHP][Phosph] system.

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