Carbide-Supported Au Catalysts for Water–Gas Shift Reactions: A New Territory for the Strong Metal–Support Interaction Effect
- 3 October 2018
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 140 (42), 13808-13816
- https://doi.org/10.1021/jacs.8b08246
Abstract
Strong metal-support interaction (SMSI) has been regarded as one of the most important concepts in heterogeneous catalysis, which has been almost exclusively discussed in metal/oxide catalysts. Here, we show that gold/molybdenum carbide (Au/MoCx) catalysts are featured by highly dispersed Au overlayers, strong interfacial charge transfer between metal and support, and excellent activity in low temperature water-gas-shift reaction (LT-WGSR), demonstrating the active SMSI state. Subsequent oxidation treatment results in strong aggregation of Au nanoparticles, weak interfacial electronic interaction, and poor LT-WGSR activity. The two interface states can be transformed into each other by alternative carbonization and oxidation treatments. This work reveals the active SMSI effect in metal/carbide catalysts induced by carbonization, which opens a new territory for this important concept.Keywords
Funding Information
- Ministry of Science and Technology of the People's Republic of China (2016YFA0200200, 2017YFB0602205)
- National Natural Science Foundation of China (21688102, 91545204, 21573224)
- Chinese Academy of Sciences (XDB17020000)
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