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• W2071071375 abstract "Hydrolysis of mixtures consisting of sodium borohydride NaBH(4) (SB) and ammonia borane NH(3)BH(3) (AB) was studied in the absence/presence of a Co catalyst. The kinetics of the H(2) evolutions was measured. The reactions were followed in situ by solution-state (11)B NMR and the hydrolysis by-products characterized by NMR, XRD and IR. It is demonstrated that the combination of the two compounds gives a synergetic effect. SB rapidly reduces the Co catalyst precursor and the NH(4)(+) ions from AB contribute in the dispersion of the in situ formed Co nanoparticles. As a result, the kinetics of H(2) evolution is greatly improved. For instance, a hydrogen generation rate of 29.6 L min(-1) g(-1)(Co) was found for a mixture consisting of 81 wt% NH(3)BH(3), 9 wt% NaBH(4) and 10 wt% CoCl(2). By (11)B NMR, it was showed that the reaction mechanisms are quite trivial. As soon as the Co catalyst forms in situ, SB, rather than AB, hydrolyzes until it is totally converted. Then, the overall hydrolysis continues with that of AB. Both reactions follow a bimolecular Langmuir-Hinshelwood mechanism; no reaction intermediates were observed during the process. In fact, SB and AB convert directly into B(OH)(4)(-), which comes in equilibrium with a polyborate compound identified as B(3)O(3)(OH)(4)(-). All of these results are discussed herein." @default.
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• W2071071375 date "2011-01-01" @default.
• W2071071375 modified "2023-10-16" @default.
• W2071071375 title "Enhanced hydrogen release by catalyzed hydrolysis of sodium borohydride–ammonia borane mixtures: a solution-state 11B NMR study" @default.
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• W2071071375 doi "https://doi.org/10.1039/c0cp02090g" @default.
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