Physical, structural, and dehydrogenation properties of ammonia borane in ionic liquids

Tessui Nakagawa, Anthony K. Burrell, Rico E. Del Sesto, Michael T. Janicke, Adam L. Nekimken, Geraldine M. Purdy, Biswajit Paik, Rui Qin Zhong, Troy A. Semelsberger, Benjamin L. Davis

    Research output: Contribution to journalArticlepeer-review

    16 Citations (Scopus)


    Ionic liquids (ILs) are excellent solvents for the dehydrogenation of ammonia borane (AB); however, the basic properties that allow efficient dehydrogenation are still unclear. In this report, density, viscosity, melting/freezing/glass transition temperature, solubility, and the dehydrogenation properties, including impurity gas quantification, of AB-imidazolium-based IL solutions were studied. Note that ILs can solubilize 32-35 wt% of AB, and the liquid AB-IL solutions have densities of ∼0.9 g cm-3, viscosities similar to motor oil (100-250 cP), and glass transition temperatures below -50 °C. AB-ILs are stable at room temperature for several weeks with minimal hydrogen generation, although some hydrolysis occurs immediately upon mixing as a result of trace water content. Between 80 and 130 °C, more than 2 mol H2/AB are desorbed from AB-ILs with limited impurity emissions. Furthermore, there is no reaction between AB and ILs upon dehydrogenation, and structural analysis reveals a complex solid solution. This journal is

    Original languageEnglish
    Pages (from-to)21681-21687
    Number of pages7
    JournalRSC Advances
    Issue number42
    Publication statusPublished - 2014

    ASJC Scopus subject areas

    • Chemistry(all)
    • Chemical Engineering(all)


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