کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1277411 | 1497623 | 2009 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: The influence of different additives on the solid-state reaction of magnesium hydride (MgH2) with Si The influence of different additives on the solid-state reaction of magnesium hydride (MgH2) with Si](/preview/png/1277411.png)
The possibility of increasing the solid-state reaction rate of MgH2 with Si by modifying the mixture preparation method and adding chemical compounds or elements, such as niobium pentafluoride (NbF5), nano-titanium (IV) oxide (TiO2), nano-chromium (III) oxide Cr2O3, yttrium, and nano- and microsized nickel, was investigated. The results show that changing the milling parameters of the MgH2 and Si mixture in a planetary ball mill greatly affects the rate of direct reaction between them and allows the reaction to take place at temperatures as low as 200 °C with an equilibrium pressure over 1 bar. Moreover, all additives significantly enhanced the reaction speed. The reaction pathway was found to be different for decomposition in a hydrogen vacuum and pressures of several bars. Reactions of the powders investigated did not occur at temperatures below 150 °C.
Journal: International Journal of Hydrogen Energy - Volume 34, Issue 18, September 2009, Pages 7692–7699