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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Synthesis of calcium alanate and its dehydriding performance enhanced by FeF_3 doping
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Synthesis of calcium alanate and its dehydriding performance enhanced by FeF_3 doping

机译：FeF_3掺杂增强丙氨酸钙的合成及其脱水性能

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摘要

Ca(AlH_4)_2 was synthesized by ball-milling the mixture of NaAlH_4 and CaCb in a molar ratio of 2:1 and under a hydrogen atmosphere of 1 MPa. The results indicate that the reactants have entirely transformed to Ca(AlH_4 )2 with a byproduct of NaCl after ball-milling for 48 h. Investigations of dehydriding behavior of the as-prepared Ca(AlH_4)_2 sample show that approximately 5.2wt.% of hydrogen is desorbed during the first two dehydrogenation reactions of Ca(AlH_4)_2, which exhibit an exothermic event at 148 °C and an endothermic event at 267 °C, respectively. The high temperature dehydrogenation at 267 °C mainly concentrates on the thermolysis of CaAlH_5 intermediate. FeF_3-doped Ca(AlH_4)_2 system represents an improved dehydriding performance, the dehydrogenation temperature of CaAlH_5 intermediate is decreased about 43 °C. After FeF_3 doping, the apparent activation energy of CaAlH_5 is reduced from 153.4kJ/mol (undoped) to 88.3 kJ/mol (doped), it renders a possibility to realize the rehydrogenation of CaAlH_5. The catalytic effect is attributed to a fluorine transfer reaction that occurred to generate CaF_2 and Fe catalysts.
机译：通过以2：1的摩尔比在1 MPa的氢气气氛下球磨NaAlH_4和CaCb的混合物来合成Ca（AlH_4）_2。结果表明，球磨48 h后，反应物已与NaCl副产物完全转化为Ca（AlH_4）2。所制备的Ca（AlH_4）_2样品的脱水行为研究表明，在Ca（AlH_4）_2的前两个脱氢反应过程中，约5.2wt。％的氢被解吸，这在148°C时出现放热事件。分别在267°C下发生吸热事件。 267°C下的高温脱氢主要集中在CaAlH_5中间体的热解上。 FeF_3掺杂的Ca（AlH_4）_2体系表现出改善的脱水性能，CaAlH_5中间体的脱氢温度降低了约43°C。 FeF_3掺杂后，CaAlH_5的表观活化能从153.4kJ / mol（未掺杂）降低到88.3kJ / mol（掺杂），这使得实现CaAlH_5的再氢化成为可能。催化作用归因于发生的氟转移反应，生成CaF_2和Fe催化剂。

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