Thermochemical transformation and reversible performance of Mg(NH2)2–NaMgH3 system

Thermochemical transformation and reversible performance of Mg(NH2)2–NaMgH3 system
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Mg(NH2)2—NaMgH3体系的热化学转化及可逆性能

DOI:
10.1016/j.ijhydene.2020.06.094
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发表时间:
2020-07
影响因子:
7.2
通讯作者:
Ping Chen
Ping Chen
中科院分区:
工程技术2区
文献类型:
--
作者:
Zhao Zhang;Hujun Cao;Weijin Zhang;Jirong Cui;Zhitao Xiong;Ping Chen

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通过引入Na,首次实现了Mg(NH 2)2-MgH 2体系的可逆吸氢。通过结构表征和气体脱附分析研究了Mg(NH 2)2-xNaMgH 3(x = 0.5,1和2)复合材料的热化学和机械化学转变。探讨了Mg(NH 2)2-NaMgH 3的加氢性能和反应机理。实验结果表明,用NaMgH 3代替MgH 2可以有效地抑制Mg(NH 2)2-MgH 2体系的氨排放,并改善其放氢性能。对于Mg(NH 2)2-NaMgH 3体系,其低温热化学反应与机械力化学反应十分相似。在高温(190 °C)下,检测到NaMg(NH 2)(NH)的形成。Na的引入改变了Mg(NH 2)2-MgH 2体系的反应路线,提高了反应焓。由MgNH和NaNH_2反应合成了NaMg(NH_2)(NH)化合物,它在10 atm和190 °C下可逆储氢量为1.8wt%。NaMg(NH 2)(NH)和Mg(NH 2)2之间的可逆循环是Mg(NH 2)2-NaMgH 3体系部分可逆加氢的原因。
Reversible hydrogen uptake of Mg(NH2)2–MgH2system has been achieved by the introduction of Na for the first time. The thermochemical and mechanochemical transformations of Mg(NH2)2-xNaMgH3(x = 0.5, 1 and 2) composites have been investigated through structural characterizations and gas desorption analyses. The hydrogenation property and reaction mechanism of Mg(NH2)2–NaMgH3have been discussed. Experimental results indicate that the replacement of NaMgH3for MgH2can extensively suppress ammonia emission and improve the hydrogen desorption property of Mg(NH2)2–MgH2system. For Mg(NH2)2–NaMgH3system, its thermochemical reaction at low temperature is quite similar to the reaction under mechanochemical process. At high temperature (190 °C), the formation of NaMg(NH2)(NH) is detected. The introduction of Na alters the reaction route and enhances the reaction enthalpy of Mg(NH2)2–MgH2system. The compound of NaMg(NH2)(NH) is synthesized by the reaction of MgNH and NaNH2and it can reversibly store 1.8 wt% of hydrogen at 10 atm and 190 °C. The reversible cycling between NaMg(NH2)(NH) and Mg(NH2)2is responsible for the partial reversible hydrogenation of Mg(NH2)2–NaMgH3system.
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