Nickel- and cobalt-based catalysts for hydrogen generation by hydrolysis of borohydride
Nickel- and cobalt-based catalysts for hydrogen generation by hydrolysis of borohydride
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DOI：
10.1016/j.jallcom.2005.08.019
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发表时间：
2006-05-18
影响因子：
6.2
通讯作者：
Suda, S.
中科院分区：
文献类型：
--
作者：
Liu, Bin Hong;Li, Zhou Peng;Suda, S.
硼氢化物是一类含氢量较大的化合物，它的水解反应很容易产生氢气。本研究开发了以镍和钴为基础的催化剂，以加速水解制氢反应。对每种金属进行了四种形式的催化剂测试：细金属粉末、金属盐、金属硼化物和雷尼金属。结果表明，在这些催化剂的催化下，该反应主要为零级反应。虽然钴在大多数情况下表现出比镍更高的催化活性，但Raney Ni的催化活性几乎与Raney Co相同。在镍的四种化学形式中，Raney Ni表现出最好的性能。此外，由镍和钴合金制成的Raney催化剂表现出更高的活性。在Raney金属上的反应也是由于传质限制，在低浓度的硼氢化物上氢气生成速度减慢。(C)2005 Elsevier B.V.保留所有权利。
Borohydrides, a group of compounds with large hydrogen contents, can generate hydrogen readily by their hydrolysis reaction. In this study catalysts based on nickel and cobalt were developed to accelerate the hydrolysis reaction for hydrogen generation. Catalysts in four forms were tested for each metal: fine metal powder, metal salt, metal boride and Raney metal. It was found that the hydrolysis reaction was primary a zero-order reaction under the catalysis of these catalysts. Although cobalt showed higher catalytic activity than nickel in most cases, Raney Ni exhibited almost the same activity as the Raney Co. Among four chemical forms for nickel, Raney Ni demonstrated the best performance. Moreover, Raney catalysts made from alloys of nickel and cobalt showed even higher activity. The reaction on Raney metals was also characterized by a slowdown in hydrogen generation rate at low borohydride concentrations because of a mass transfer limitation. (c) 2005 Elsevier B.V. All rights reserved.