کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7736228 | 1497964 | 2014 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Influence of M-B (MÂ =Â Fe, Co, Ni) on aluminum-water reaction
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In this work, the aluminum-water reaction induced by Fe-B, Co-B and Ni-B particles was studied. The catalysts were mixtures of the metal boride and metallic particles. The chainlike Fe-B catalyst forms a network structure under the influence of an external magnetic field and has a large specific surface area. Aggregated particles of Co-B and Ni-B catalyst have small specific surface area. Catalytic activity in the initial corrosion of aluminum increases with increasing Fe-B content because of the large specific surface area and the formation of a micro galvanic cell. However, the amount of hydrogen generated slowly decreases with increasing amount of Co-B and Ni-B. The activity of Fe-B, Co-B and Ni-B in the initial Al/H2O reaction decreases in the order Fe-BÂ >Â Ni-BÂ >Â Co-B. The calculated apparent activation energies in the presence of Fe-B, Co-B and Ni catalysts are 38.2, 39 and 29.6Â kJÂ molâ1, respectively. Aluminum is rapidly and completely corroded in a weakly alkaline solution (pHÂ <Â 10) after consecutive additions of Al batches because of high concentrations of OHâ in the local domain and an increase in the amount of Al(OH)3 precipitate.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 268, 5 December 2014, Pages 550-556
Journal: Journal of Power Sources - Volume 268, 5 December 2014, Pages 550-556
نویسندگان
H.X. Meng, N. Wang, Y.M. Dong, Z.L. Jia, L.J. Gao, Y.J. Chai,