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Issue 9, 2011
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Releasing 17.8 wt% H2 from lithium borohydride ammoniate

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Abstract

Release of ca. 17.8 wt% of hydrogen was observed from the Co-catalyzed lithium borohydride ammoniate, Li(NH3)4/3BH4 (with equivalent protic and hydridic hydrogen atoms, composed of solid Li(NH3)BH4 and liquid Li(NH3)2BH4), in the temperature range of 135 to 250 °C in a closed vessel. The low NH3 equilibrium vapor pressure of the ammoniate in the vessel results in the retention of the majority of NH3 in the vicinity of LiBH4, and thus, creates an environment favorable for the direct dehydrogenation rather than deammoniation. The dehydrogenation is a two-step process forming the intermediates Li4BN3H10 and LiBH4. The final solid residue is a mixture of BN and Li3BN2. The presence of nanosized Co catalyst effectively promote the hydrogen release.

Graphical abstract: Releasing 17.8 wt% H2 from lithium borohydride ammoniate

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Publication details

The article was received on 17 Apr 2011, accepted on 29 Jun 2011 and first published on 04 Aug 2011


Article type: Paper
DOI: 10.1039/C1EE01480C
Citation: Energy Environ. Sci., 2011,4, 3593-3600
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    Releasing 17.8 wt% H2 from lithium borohydride ammoniate

    X. Zheng, G. Wu, W. Li, Z. Xiong, T. He, J. Guo, H. Chen and P. Chen, Energy Environ. Sci., 2011, 4, 3593
    DOI: 10.1039/C1EE01480C

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