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- W2313595145 abstract "Although thermodynamically unfavorable, magnesium nitride hydrogenation was realized by high-energy ball milling via the formation of hydride and amide or imide. Using a vibratory mill at room temperature, with initial H2 pressures of 40–80 bar, a constant-rate pressure decrease was observed throughout 200 h experiments, reflecting hydrogenation reaction progress. A combination of 1H and 15N solid-state magic-angle spinning (MAS) NMR techniques was used to identify unambiguously the reaction products as the metastable solid mixture of magnesium hydride and magnesium amide/imide. The NMR shows that the reaction products are disordered and of nonbulk, noncrystalline character. Our thermodynamic analysis shows that considerable pressure elevation and mechanical surface destabilization favor the hydrogenation reaction. We present an original model which suggests for the first time that the local gas pressure rises considerably in a confined zone of the fine powder impacted by colliding balls in the mill. This model describes a flow-restricted, short-term, nearly isothermal pressure elevation. The demonstrated ability to facilitate such thermodynamic unfavorable reactions and create a metastable hydrogen-rich product suggests a new concept for hydrogen storage and chemical conversion processes." @default.
- W2313595145 created "2016-06-24" @default.
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- W2313595145 date "2013-01-10" @default.
- W2313595145 modified "2023-09-27" @default.
- W2313595145 title "Playing Hardball with Hydrogen: Metastable Mechanochemical Hydrogenation of Magnesium Nitride" @default.
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- W2313595145 doi "https://doi.org/10.1021/jp310903k" @default.
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