H2 Production via Ammonia Decomposition Using Non-Noble Metal Catalysts: A Review
H2 Production via Ammonia Decomposition Using Non-Noble Metal Catalysts: A Review
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DOI：
10.1007/s11244-016-0653-4
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发表时间：
2016-09-01
影响因子：
3.6
通讯作者：
Torrente-Murciano, L.
中科院分区：
文献类型：
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作者：
Bell, T. E.;Torrente-Murciano, L.
所谓氢经济的广泛实施目前在一定程度上受到经济可行的储氢方式的限制。在此背景下，氨由于其高氢含量（17.6 wt%）通常被视为一种可行的化学储氢选择。然而，将其用作能源载体需要开发能够在适当的速率和条件下释放氢气的催化系统。目前，用于氨分解最活跃的催化系统是基于钌的，然而其成本和稀缺性阻碍了这些催化剂的大规模使用。这个问题引发了对基于更可持续体系的替代催化剂开发的研究，这些体系使用更容易获得的非贵金属，主要是铁、钴和镍，以及一系列过渡金属碳化物、氮化物和双金属体系，本文对此进行了综述。已经有一些有前景的基于钴和镍的氨分解催化剂被报道，但需要提高金属分散度才能使其成为更有吸引力的候选者。相反，铁基催化剂以及金属碳化物和氮化物似乎改进的空间较小。最有改进潜力的领域是双金属催化剂，特别是由钴和钼组成的那些。
The wide-spread implementation of the so-called hydrogen economy is currently partially limited by an economically feasible way of storing hydrogen. In this context, ammonia has been commonly presented as a viable option for chemical storage due its high hydrogen content (17.6 wt%). However, its use as an energy carrier requires the development of catalytic systems capable of releasing hydrogen at adequate rates and conditions. At the moment, the most active catalytic systems for the decomposition of ammonia are based on ruthenium, however its cost and scarcity inhibit the wide scale use of these catalysts. This issue has triggered research on the development of alternative catalysts based on more sustainable systems using more readily available, non-noble metals mainly iron, cobalt and nickel as well as a series of transition metal carbides and nitrides and bimetallic systems, which are reviewed herein. There have been some promising cobalt- and nickel-based catalysts reported for the decomposition of ammonia but metal dispersion needs to be increased in order to become more attractive candidates. Conversely, there seems to be less scope for improvement of iron-based catalysts and metal carbides and nitrides. The area with the most potential for improvement is with bimetallic catalysts, particularly those consisting of cobalt and molybdenum.