Reactive insights into the hydrogen production from ammonia borane facilitated by phosphonium based ionic liquid

  • Debashis Kundu
  • Sankar Chakma
  • Gopal Pugazhenthi
  • Tamal BanerjeeEmail author


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 4×10-2 mbar 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.


Ammonia Borane Phosphonium Ionic Liquid Boron NMR COSMO-SAC 


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Copyright information

© Korean Institute of Chemical Engineers, Seoul, Korea 2019

Authors and Affiliations

  • Debashis Kundu
    • 1
  • Sankar Chakma
    • 2
  • Gopal Pugazhenthi
    • 1
  • Tamal Banerjee
    • 1
    Email author
  1. 1.Department of Chemical EngineeringIndian Institute of Technology Guwahati, Guwahati -AssamIndia
  2. 2.Department of Chemical EngineeringIndian Institute of Science Education and Research Bhopal, Bhopal -Madhya PradeshIndia

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