LiMn(BH4)3/2LiCl复合物的反应球磨制备及其脱氢性能

doi:10.3866/PKU.WHXB20110617

Abstract

Abstract:

A LiMn(BH₄)₃/2LiCl composite was prepared by reactive ball-milling a mixture of LiBH₄ and MnCl₂, and its dehydrogenation properties were investigated. The results indicate that the LiMn(BH₄)₃/2LiCl composite consists of crystalline LiCl and amorphous LiMn(BH₄)₃, and decomposes at 135-190 °C with an activation energy of 114.0 kJ·mol^-1, resulting in an emission of 7.0% (w) gas. The released gases contain 96.0% H₂ and 4.0% B₂H₆ (mole fraction, x), which is the reason for why the mass loss of the LiMn(BH₄)₃/2LiCl composite is larger than that of theoretical hydrogen capacity of 6.3% (w). Moreover, the influence of various Ti-containing dopants on the decomposition of the LiMn(BH₄)₃/2LiCl composite was studied. We found that among TiF₃, TiC, TiN, and TiO₂, only TiF₃ achieved a reduction in decomposition temperature. Compared with the undoped LiMn(BH₄)₃/2LiCl composite, the onset decomposition temperature and the activation energy of the TiF₃-doped composite are reduced to 125 °C and to 104.0 kJ·mol^-1, respectively. These are attributed to the formation of Ti(BH₄)₃ in some local regions of the TiF₃-doped composite by the partial substitution of Ti for Li in LiMn(BH₄)₃.

Key words: Borohydride, Reactive ball-milling, LiMn(BH₄)₃, Dehydrogenation property, Catalysis

MSC2000:

O643

FANG Fang, LI Yong-Tao, SONG Yun, ZHA Jun, ZHAO Bin, SUN Da-Lin. LiMn(BH₄)₃/2LiCl Composite Synthesized by Reactive Ball-Milling and Its Dehydrogenation Properties[J].Acta Phys. -Chim. Sin., 2011, 27(06): 1537-1542.

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LiMn(BH₄)₃/2LiCl Composite Synthesized by Reactive Ball-Milling and Its Dehydrogenation Properties

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LiMn(BH₄)₃/2LiCl Composite Synthesized by Reactive Ball-Milling and Its Dehydrogenation Properties