Minimizing water utilization in hydrolysis of sodium borohydride: The role of sodium metaborate hydrates
Minimizing water utilization in hydrolysis of sodium borohydride: The role of sodium metaborate hydrates
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DOI：
10.1016/j.ijhydene.2007.08.014
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发表时间：
2007-12-01
影响因子：
7.2
通讯作者：
Matthews, Michael A.
中科院分区：
文献类型：
--
作者：
Marrero-Alfonso, Eyma Y.;Gray, Joshua R.;Matthews, Michael A.
氢可以从化学氢化物的水解中获得，这使氢储存成为一个有趣的选择。化学氢化物水解所得的重量和体积能量密度在很大程度上取决于该过程所需的水量。硼氢化钠的蒸汽水解产生水合偏硼酸盐副产物，其中偏硼酸盐的水合程度与反应中水的量密切相关。这些偏酸钠副产物的实验表征表明，在各种反应条件下，蒸汽水解的主要副产物是NaBO2中心点2H(2)O。用基团贡献法估计了各种水合偏酸盐的生成热和自由能。这一信息将有助于建立副产物的优选（稳定）水化状态，并将其与亚稳产物区分开来。(c) 2007年国际氢能协会。Elsevier Ltd.出版。版权所有。
hydrogen can be obtained from hydrolysis of chemical hydrides making this an interesting option for hydrogen storage. The gravimetric and volumetric energy densities attainable from hydrolysis of chemical hydrides depend in large measure on the amount of water required for the process. The steam hydrolysis of sodium borohydride produces hydrated metaborate byproducts in which the degree of hydration of the metaborate is closely tied to the amount of water in the reaction. Experimental characterization of these sodium metaborate byproducts indicates that the primary byproduct of steam hydrolysis is NaBO2 center dot 2H(2)O under a variety of reaction conditions. A group contribution method is used to estimate the heats and free energies of formation of a variety of hydrated metaborates. This information will be useful in establishing the preferred (stable) hydration state of the byproducts and in distinguishing these from metastable products. (c) 2007 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.