Lin Liu, Guotao Wu, Weidong Chen
Jan 5, 2015
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0
Influential Citations
13
Citations
Journal
International Journal of Hydrogen Energy
Abstract
Abstract Interaction of [BHx] and [NHx] species gives rise of molecular hydrogen and the set-up of B–N bond. Metal amides and ammonia are the commonly used [NHx] sources. Herein, urea (CO(NH2)2), an organic carbonyl diamide, was applied to react with LiBH4. A new type of complex hydrides LiBH4·CO(NH2)2, was synthesized by ball milling LiBH4 and CO(NH2)2 in a molar ratio of 1:1 in this work. Structural analyses show that this newly developed complex has a monoclinic structure (space group C12/c1) with unit-cell parameters of a = 14.629(2) A, b = 5.8701(11) A, c = 13.662(3) A, β = 115.135(7)°, and V = 1062.1(3) A3, in which Li+ coordinates with two [BH4]− groups and two O atoms of two CO(NH2)2 molecules. The dehydrogenation properties of LiBH4·CO(NH2)2 were subsequently measured, and ca. 8.13 wt% of H2 can be released exothermically at temperatures below 250 °C.