Mechanisms and possible applications of the Al-H2O reaction under extreme pH and low hydrothermal temperatures
Mechanisms and possible applications of the Al-H2O reaction under extreme pH and low hydrothermal temperatures
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DOI：
10.1016/j.ijhydene.2019.09.152
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发表时间：
2019-11-15
影响因子：
7.2
通讯作者：
Saishu, Hanae
中科院分区：
文献类型：
--
作者：
Alviani, Vani Novita;Setiani, Putri;Saishu, Hanae
Al和H2O的反应是可再生产生H-2（一种燃烧只会产生水的环保燃料）的有前途的方法，因为它不直接包括化石燃料的转换。该反应以HCl，H2SO4和NaOH的极端pH值低至1和13.5的高度研究，以及在40-100度的低热液温度下。 2生产，在较高的温度和更极端的pH值（酸性或碱性）下的产量要大得多。碱性条件始终比酸性条件更偏爱H-2的快速生产。在最极端的条件下，对于酸性和碱性反应，活化能与60 kJ mol（-1）相似。一个预测酸性反应中H-2产生的模型是从反应机理和动力学中得出的。该模型非常适合在日本东北部的塔川和Zao温泉的现场测量。这项研究将使用天然酸性温泉或碱性工业废水有助于开发工业H-2生产系统。 （c）2019氢能出版物有限责任公司。由Elsevier Ltd.出版。保留所有权利。
The reaction of Al and H2O is a promising method for the renewable production of H-2 (an environmentally friendly fuel whose combustion produces only water), because it does not directly include fossil fuels conversion. This reaction was studied at extreme pH values as low as 1 and as high as 13.5 with HCl, H2SO4, and NaOH, and at low hydrothermal temperatures of 40-100 degrees C. Factors such as pH, temperature, and solution medium influenced H-2 production, which was considerably greater at higher temperatures and more extreme pH (acidic or alkaline). Alkaline conditions consistently favored more rapid H-2 production than acidic conditions. Under the most extreme conditions, the activation energy was similar to 60 kJ mol(-1) for both acidic and alkaline reactions. A model predicting H-2 production in acidic reactions was derived from the reaction mechanism and kinetics. The model yielded a good fit to on-site measurements at the Tamagawa and Zao hot springs in northeast Japan. This study would aid the development of industrial H-2 production systems using natural acidic hot springs or alkaline industrial wastewater. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.