Formation of Na3AlH6 from a NaH/Al mixture and Ti-containing catalyst

Formation of Na3AlH6 from a NaH/Al mixture and Ti-containing catalyst
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由 NaH/Al 混合物和含钛催化剂形成 Na3AlH6

DOI:
10.1016/j.actamat.2008.12.033
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发表时间:
2009-04
期刊:
影响因子:
9.4
通讯作者:
Sun, Dalin
Sun, Dalin
中科院分区:
材料科学1区
文献类型:
--
作者:
Fang, Fang;Zheng, Shiyou;Chen, Guorong;Sang, Ge;He, Bo;Wei, Shiqiang;Sun, Dalin

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为了研究含Ti催化剂对Na-Al-H体系氢化物生成的影响,在氢气压力为5 MPa、温度为100-140°C的条件下,对Ti(OBun)4和TiF 3掺杂的NaH/Al粉末进行氢化,得到Na 3AlH 6。X射线衍射和差示扫描量热分析表明,TiF 3比Ti(OBun)4更有利于促进Na 3AlH 6的生成。X射线吸收光谱分析表明,在掺杂和氢化过程中,Ti4+或Ti 3+离子被还原为Ti 1+或Ti 0,形成具有两个配位壳层的Ti-Al对。两种含Ti催化剂之间的催化活性差异可归因于它们与NaH/Al混合物形成Ti-Al对的能力。
To investigate the effects of Ti-containing catalyst on the hydride formation in the Na–Al–H system, Ti(OBun)4- and TiF3-doped NaH/Al powders were hydrogenated into Na3AlH6by controlling the hydrogen pressure at 5MPa and the temperature at 100–140°C. X-ray diffraction and differential scanning calorimetry showed that TiF3was more catalytically favorable than Ti(OBun)4to enhance the formation of Na3AlH6. X-ray absorption spectroscopy revealed that the initial Ti4+or Ti3+ions were reduced to Ti1+or Ti0and form Ti–Al pairs with two coordination shells during the doping and hydrogenation processes. The difference in catalytic activity between the two Ti-containing catalysts can be attributed to their ability to form Ti–Al pairs with the NaH/Al mixture.
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