کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1517146 | 1511581 | 2010 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Chemical reactions in cracks of aluminum crystals: Generation of hydrogen from water Chemical reactions in cracks of aluminum crystals: Generation of hydrogen from water](/preview/png/1517146.png)
Pure hydrogen is generated from water molecules which are dissociated by specific aluminum particles called activated Al powder. Reaction mechanism of Al atoms with H2O molecules is investigated in micro-cracks of Al crystals. It becomes obvious that hydrogen atoms exist in Al crystal mainly in states of AlH3 hydrides. It is concluded that virgin walls of micro-cracks right after the creation provide virtually Al radical atoms of (Al−) or (Al=) with one or two free bonds, which react with H2O molecules via surface diffusion resulting in producing AlH3 and eventually in producing H2. The production of H2 seems to be a result of micro-tribochemical reactions in cracks, which are produced by mechanical crushing of Al crystals in water; tips of cracks as stress-focused points play a major role to create AlH3. Peculiar environments of nano-spaces in micro-cracks surrounded by reactive atoms enable us to realize unusual chemical reactions at low temperatures as exemplified in the present paper.
Journal: Journal of Physics and Chemistry of Solids - Volume 71, Issue 9, September 2010, Pages 1251–1258