Effect of different modification agents on hydrogen-generation by the reaction of Al with water
Effect of different modification agents on hydrogen-generation by the reaction of Al with water
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DOI：
10.1016/j.ijhydene.2010.07.027
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发表时间：
2010-09-01
影响因子：
7.2
通讯作者：
Ye, Jinhua
中科院分区：
文献类型：
--
作者：
Deng, Zhen-Yan;Tang, Ye-Bin;Ye, Jinhua
采用γ-Al_2O_3、α-Al_2O_3和TiO_2三种不同的改性剂对Al颗粒进行表面改性。研究了不同改性剂对改性铝粉与水反应产氢的影响。结果表明，不同的改性剂对铝与水的反应动力学有不同的影响。γ-Al_2 O_3改性Al粉的完全产氢时间明显短于γ-Al_2 O_3 α和TiO_2改性Al粉，这是由于它们对反应开始的诱导时间不同。可能的机制分析表明，在加工过程中的相变和由此产生的削弱铝颗粒表面层强烈依赖于形核能垒的修改氧化物晶粒。由于γ-Al 2 O3具有较低的形核能垒，Al颗粒表层的相变相对完全，因此γ-Al 2 O3改性的Al粉末具有较短的诱导期和与水完全反应的时间。这表明铝的表面改性可能源于其表面层的相变。(C)2010年教授T。Nejat Veziroglu。由爱思唯尔有限公司出版。保留所有权利。
Three different modification agents, gamma-Al2O3, -Al2O3, a and TiO2 were used to modify Al particle surfaces. The effect of different modification agents on hydrogen-generation by the reaction of modified Al powder with water was investigated. It was found that different modification agents have different effect on the reaction dynamics of Al with water. The complete hydrogen-generation time of gamma-Al2O3 modified Al powder is obviously shorter than that of gamma-Al2O3 a and TiO2 modified Al powders, because of their different induction time for the beginning of the reaction. Possible mechanism analyses indicated that the phase transformation and resultant weakening of Al particle surface layer during processing strongly depends on the nucleation energy barrier on modification oxide grains. As gamma-Al2O3 has a low nucleation energy barrier, the phase transformation of Al particle surface layer is relatively complete so that gamma-Al2O3 modified Al powder has a short induction and complete reaction time with water. This implies that the Al surface modification probably originates from the phase change of its surface layer. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.