Releasing 17.8 wt% H2 from lithium borohydride ammoniate
Releasing 17.8 wt% H2 from lithium borohydride ammoniate
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DOI：
10.1039/c1ee01480c
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发表时间：
2011-08
影响因子：
32.5
通讯作者：
Xue-li Zheng;Guotao Wu;Wen Li;Zhitao Xiong;Teng He;Jianping Guo;Hua Chen;Ping Chen
中科院分区：
文献类型：
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作者：
Xue-li Zheng;Guotao Wu;Wen Li;Zhitao Xiong;Teng He;Jianping Guo;Hua Chen;Ping Chen
在封闭的容器中，在135~250°C的温度范围内，从Co催化的Li(NH3)4/3BH4(由固体Li(NH3)BH4和液体Li(NH3)2BH4组成，具有相当的质子氢和氢化氢原子)中观察到大约17.8wt%的氢的释放。容器内氨化物的低NH3平衡蒸汽压导致大部分NH3滞留在LiBH4附近，从而创造了有利于直接脱氢而不是脱氨的环境。脱氢是一个两步过程，生成中间体Li4BN3H10和LiBH4。最终的固体残留物是BN和Li3BN的混合物。纳米Co催化剂的存在有效地促进了氢气的释放。
Release of ca. 17.8 wt% of hydrogen was observed from the Co-catalyzed lithium borohydride ammoniate, Li(NH3)4/3BH4 (with equivalent protic and hydridic hydrogen atoms, composed of solid Li(NH3)BH4 and liquid Li(NH3)2BH4), in the temperature range of 135 to 250 °C in a closed vessel. The low NH3 equilibrium vapor pressure of the ammoniate in the vessel results in the retention of the majority of NH3 in the vicinity of LiBH4, and thus, creates an environment favorable for the direct dehydrogenation rather than deammoniation. The dehydrogenation is a two-step process forming the intermediates Li4BN3H10 and LiBH4. The final solid residue is a mixture of BN and Li3BN2. The presence of nanosized Co catalyst effectively promote the hydrogen release.