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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Effect of Na3FeF6 catalyst on the hydrogen storage properties of MgH2
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Effect of Na3FeF6 catalyst on the hydrogen storage properties of MgH2

机译：Na3FeF6催化剂对MgH2储氢性能的影响

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The effects of Na3FeF6 catalyst on the hydrogen storage properties of MgH2 have been studied for the first time. The results showed that for the MgH2 sample doped with 10 wt% Na3FeF6, the onset dehydrogenation temperature decreased to 255 degrees C, which was 100 degrees C and 162 degrees C lower than those of the asmilled and as-received MgH2 sample, respectively. The re/dehydrogenation kinetics were also significantly enhanced compared to the un-doped MgH2. The absorption kinetics showed that the as-milled MgH2 only absorbed 3.0 wt% of hydrogen at 320 degrees C in 2 min of rehydrogenation, but about 3.6 wt% of hydrogen was absorbed within the same period of time after 10 wt% Na3FeF6 was added to MgH2. The desorption kinetics showed that the MgH2 + 10 wt% Na3FeF6 sample could desorb about 3.8 wt% of hydrogen in 10 min at 320 degrees C. In contrast, the un-doped MgH2 sample desorbed only 0.2 wt% of hydrogen in the same period of time. The activation energy for the decomposition of the as-milled MgH2 was 167.0 kJ mol(-1), and this value decreased to 75.0 kJ mol(-1) after the addition of 10 wt% Na3FeF6 (a reduction by about 92.0 kJ mol(-1)). It is believed that the in situ formation of the active species of NaMgF3, NaF and Fe during the heating process could enhance the hydrogen storage properties of MgH2, due to the catalytic effects of these new species.
机译：首次研究了Na3FeF6催化剂对MgH2储氢性能的影响。结果表明，对于掺有10 wt％Na3FeF6的MgH2样品，起始脱氢温度降至255摄氏度，分别比经研磨和接受的MgH2样品低100摄氏度和162摄氏度。与未掺杂的MgH2相比，重/脱氢动力学也得到了显着增强。吸收动力学表明，研磨后的MgH2在320加氢的氢气中在2分钟的再氢化中仅吸收了3.0 wt％的氢，但是在向其中添加10 wt％的Na3FeF6之后的同一时间内吸收了约3.6 wt％的氢。硫酸镁解吸动力学表明，MgH2 + 10 wt％Na3FeF6样品在320摄氏度下可在10分钟内解吸约3.8 wt％的氢气。相反，未掺杂的MgH2样品在同一时间内仅解吸0.2 wt％的氢。时间。研磨后的MgH2分解的活化能为167.0 kJ mol（-1），加入10 wt％Na3FeF6后，该值降至75.0 kJ mol（-1）（减少约92.0 kJ mol（-1） -1））。据信在加热过程中NaMgF3，NaF和Fe活性物种的原位形成可以增强MgH2的储氢性能，这是由于这些新物种的催化作用。

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