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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 >Dynamic in situ X-ray diffraction of catalyzed alanates
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Dynamic in situ X-ray diffraction of catalyzed alanates

机译：催化丙氨酸的动态原位X射线衍射

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摘要

The discovery that hydrogen can be reversibly absorbed and desorbed from NaAlH_4 by the addition of catalysts has created an entirely new prospect for lightweight hydrogen storage. NaAlH_4 releases hydrogen through the following set of decomposition reactions:NaAlH_4 -> 1/3 (#alpha# -Na_3AlH_6) + 2/3Al + H_2 -> NaH + Al + 3.2H_2These decomposition reactions as well as the reverse recombination reaction were directly observed using time-resolved in situ X-ray powder diffraction. These measurements were performed under conditions similar to those found in PEM fuel cell operations (hydrogen absorption, 50-70 deg C, 10-15 bar H_2; hydrogen desorption, 80-110 deg C, 5-100 mbar H_2). Catalyst doping was found to dramatically improve kinetics under these conditions. In this study, the alanate was doped with a catalyst by dry ball-milling NaAlH_4 with 2 mol. Percent solid TiCl_3. X-ray diffraction clearly showed that TiCl_3 reacts with NaAlH_4 to form NaCl during the doping process. Partial desorption of NaAlH_4 was even observed to occur during the catalyst doping process.
机译：通过添加催化剂可以使氢从NaAlH_4中可逆地吸收和解吸，这一发现为轻质储氢创造了全新的前景。 NaAlH_4通过以下一组分解反应释放氢：NaAlH_4-> 1/3（＃alpha＃-Na_3AlH_6）+ 2 / 3Al + H_2-> NaH + Al + 3.2H_2可直接观察到这些分解反应以及反向重组反应使用时间分辨原位X射线粉末衍射。这些测量是在类似​​于PEM燃料电池操作中发现的条件下进行的（氢吸收，50-70℃，10-15 bar H_2;氢解吸，80-110℃，5-100 mbar H_2）。发现在这些条件下催化剂掺杂显着改善了动力学。在这项研究中，通过对2摩尔的NaAlH_4进行干式球磨，将丙氨酸盐掺入催化剂。固体TiCl_3的百分比。 X射线衍射清楚地表明，在掺杂过程中，TiCl_3与NaAlH_4反应形成NaCl。在催化剂掺杂过程中甚至观察到NaAlH_4的部分解吸。

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