Transition metal catalysed dehydrogenation of amine-borane fuel blends.
نویسندگان
چکیده
Mixtures containing ammonia-borane and sec-butylamine-borane remain liquid throughout the hydrogen release process that affords tri(N-sec-butyl)borazine and polyborazylene. Concentrated solutions with metal catalysts afford >5 wt% H(2) in 1 h at 80 °C and addition of (EMIM)EtSO(4) ionic liquid co-solvent eliminates competing formation of insoluble linear poly(aminoborane) (EMIM = 1-ethyl-3-methyl-imidazolium).
منابع مشابه
Transition metal catalysed ammonia-borane dehydrogenation in ionic liquids.
Significant advantages result from combining the disparate hydrogen release pathways for ammonia-borane (AB) dehydrogenation using ionic liquids (ILs) and transition metal catalysts. With the RuCl(2)(PMe(3))(4) catalyst precursor, AB dehydrogenation selectivity and extent are maximized in an IL with a moderately coordinating ethylsulfate anion.
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While thermolysis of ammonia-borane (AB) affords a mixture of aminoborane- and iminoborane oligomers, the most selective metal-based catalysts afford exclusively cyclic iminoborane trimer (borazine) and its B-N cross-linked oligomers (polyborazylene). This catalysed dehydrogenation sequence proceeds through a branched cyclic aminoborane oligomer assigned previously as trimeric B-(cyclodiborazan...
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متن کاملCoordination of aminoborane, NH(2)BH(2), dictates selectivity and extent of H(2) release in metal-catalysed ammonia borane dehydrogenation.
In situ(11)B NMR monitoring, computational modeling, and external trapping studies show that selectivity and extent of H(2) release in metal-catalysed dehydrogenation of ammonia borane, NH(3)BH(3), are determined by coordination of reactive aminoborane, NH(2)BH(2), to the metal center.
متن کاملAmino-borane oligomers bound to a Rh(I) metal fragment.
Coordination complexes of previously observed intermediates, H(3)B.NMe(2)BH(2).NMe(2)H and [H(2)BNMeH](3), in the transition metal catalysed dehydrocoupling of H(3)B.NMe(2)H and H(3)B.NMeH(2) have been isolated and structurally characterised using the [Rh{PR'(2)(eta(2)-C(5)H(7))}](+) fragment. Their onward reactivity shows that further dehydrogenation is not a simple intramolecular process.
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ورودعنوان ژورنال:
- Chemical communications
دوره 47 10 شماره
صفحات -
تاریخ انتشار 2011