X-ray absorption study of Ti-activated sodium aluminum hydride
X-ray absorption study of Ti-activated sodium aluminum hydride
复制标题
DOI：
10.1063/1.1773614
复制
发表时间：
2004-07-19
影响因子：
4
通讯作者：
Tyson, TA
中科院分区：
文献类型：
--
作者：
Graetz, J;Reilly, JJ;Tyson, TA
利用钛K边X射线吸收近边光谱研究了钛活化丙氨酸钠中钛的价态和配位情况。根据一套标准，建立了钛的价态与钛K边起始的经验关系。该关系式被用来估算钛催化剂在2和4摩尔%钛掺杂的NaAlH4中的氧化状态。结果表明，在掺杂的丙氨酸钠中，钛的形式价态为零，氢循环过程中钛的价态几乎不变。边缘精细结构的定性比较表明，钛以非晶态TiAl3的形式存在于表面。(C)2004年美国物理研究所。
Ti K-edge x-ray absorption near-edge spectroscopy was used to explore the Ti valence and coordination in Ti-activated sodium alanate. An empirical relationship was established between the Ti valence and the Ti K-edge onset based on a set of standards. This relationship was used to estimate oxidation states of the titanium catalyst in 2 and 4 mol % Ti-doped NaAlH4. The results demonstrate that the formal titanium valence is zero in doped sodium alanate and nearly invariant during hydrogen cycling. A qualitative comparison of the edge fine structure suggests that the Ti is present on the surface in the form of amorphous TiAl3. (C) 2004 American Institute of Physics.