In-situ H2 production via low temperature decomposition of ammonia: Insights into the role of cesium as a promoter
In-situ H2 production via low temperature decomposition of ammonia: Insights into the role of cesium as a promoter
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DOI：
10.1016/j.ijhydene.2014.03.043
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发表时间：
2014-05
影响因子：
7.2
通讯作者：
Alfred K. Hill;L. Torrente‐Murciano
中科院分区：
文献类型：
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作者：
Alfred K. Hill;L. Torrente‐Murciano
Cesium-promoted ruthenium nanoparticles supported on multi-walled carbon nanotubes catalysts are shown to be highly active for hydrogen production by ammonia decomposition. Its low temperature activity is significantly improved as the cesium loading increases, reducing the activation energy from 96.7 kJ/mol in the absence of cesium to 59.3 kJ/mol with a cesium/ruthenium molar ratio of 3. Hydrogen production was observed to proceed below 590 K which represents a breakthrough towards the use of ammonia as chemical storage forin-situhydrogen production on fuel cells. The catalytic enhancement is shown to be due to the electronic modification of ruthenium by the electron donating cesium promoter located on the ruthenium surface and in close proximity on the CNT surface. However, higher promoter loadings above a cesium/ruthenium ratio of 3 leads to ammonia inaccessibility to the catalytic active sites.
