pH值对铝水反应产氢影响.pdfVIP

pH 值对铝水反应产氢的影响# 盖卫卓，邓振炎** （上海大学物理系，上海 200444 ） 5 摘要：本文系统地研究了纯铝粉体在不同pH 值的水溶液中的反应产氢性能。纳米纯铝粉可 以在常压下与去离子水反应，反应过程可以分为三个阶段：铝颗粒表面氧化膜的水合，氢的 扩散，表面氧化膜的破裂。在pH 值为3 到9 的范围内，pH 值对铝水反应的影响可以忽略。 当pH 值增加到 10 时，铝水反应性能稍有提高，反应诱导时间从50min 降到31min。在同 浓度的酸性溶液和碱性溶液中，碱对铝水反应的影响更大。 10 关键词：铝粉；pH 值；诱导时间；产氢 中图分类号：O643.12 Effect of pH Value on the Hydrogen Generation Using Al with Water 15 GAI Weizhuo, DENG Zhenyan (Department of Physics, Shanghai University, Shanghai 200444) Abstract: In this paper, hydrogen generation using Al and water with diffenernt pH value was investigated systematically. The results showed that pure nano Al powders could react with deionized water under ambient pressure. The Al-water reaction includes three stages: (1) hydration 20 of oxide film, (2) diffusion of hydrogen, (3) breakage of the oxide film. Changing pH value from 3 to 9, pH value almost has no effect on the hydrogen generation performance of Al with water. However, when increasing pH value up to 10, the hydrogen generation performance was improved, and the reaction induction time decreased from 50 min to 31 min. In addition, the alkali has a greater effect on the reaction of Al with water than acid when they have the same concentration. 25 Keywords: Al powder; pH value; induction time; hydrogen generation 0 引言 当今世界，石油、天然气等化石燃料日趋枯竭，全球变暖日益严重，新能源的开发和利 用引起了人们的极大关注。人们迫切需要寻找一种能够替代化石燃料、用于交通工具的清洁 30 能源。氢能就是这种能源，但它是一种二次能源，必须通过其它一次能源制得。氢能能量密 度高，自然界存储量大，氢气本身无色、无臭、无毒，十分纯净。氢是一种理想的能源载体