Atomically dispersed Ir/α-MoC catalyst with high metal loading and thermal stability for water-promoted hydrogenation reaction
Open Access
- 10 February 2021
- journal article
- research article
- Published by Oxford University Press (OUP) in National Science Review
- Vol. 9 (1), nwab026
- https://doi.org/10.1093/nsr/nwab026
Abstract
Synthesis of atomically dispersed catalysts with high metal loading and thermal stability is challenging but particularly valuable for industrial application in heterogeneous catalysis. Here, we report a facile synthesis of a thermally stable atomically dispersed Ir/α-MoC catalyst with metal loading as high as 4 wt%, an unusually high value for carbide supported metal catalysts. The strong interaction between Ir and the α-MoC substrate enables high dispersion of Ir on the α-MoC surface, and modulates the electronic structure of the supported Ir species. Using quinoline hydrogenation as a model reaction, we demonstrate that this atomically dispersed Ir/α-MoC catalyst exhibits remarkable reactivity, selectivity and stability, for which the presence of high-density isolated Ir atoms is the key to achieving high metal-normalized activity and mass-specific activity. We also show that the water-promoted quinoline hydrogenation mechanism is preferred over the Ir/α-MoC, and contributes to high selectivity towards 1,2,3,4-tetrahydroquinoline. The present work demonstrates a new strategy in constructing a high-loading atomically dispersed catalyst for the hydrogenation reaction.Funding Information
- National Key Research and Development of China (2017YFB0602200)
- National Natural Science Foundation of China (21725301, 21932002, 21821004)
- Beijing Outstanding Young Scientist Program (BJJWZYJH01201914430039)
- Key Research Program of Frontier Sciences, Chinese Academy of Sciences (QYZDB-SSW-JSC019)
- Fundamental Research Funds for the Central Universities
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