Facet-dependent strong metal-support interactions control the C–O bond activation
Journal Article
·
· Chem Catalysis
- University of Delaware, Newark, DE (United States); Chinese Academy of Sciences (CAS), Dalian (China)
- University of Delaware, Newark, DE (United States)
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Molecular Foundry
Reducible metal oxides are selective and effective for C–O bond scission of hydrodeoxygenation reactions via the reverse Mars-van Krevelen mechanism. Creating efficient redox centers while minimizing metal surfaces leads to highly selective catalysts. Single noble metal atoms activate the surface M–O bond, but the catalyst activity is limited due to low loading. Here, we report that the strong metal-support interaction between Ir and CeO2 is facet sensitive, and certain facets regulate the C–O bond cleavage. At 300°C reduction, Ir is mostly encapsulated on an octahedron by (111) facets but remains exposed by (110) facets. The former is selective, whereas the latter is not. In conclusion, density functional theory indicates that Ir encapsulation is favored on (111) under reaction conditions, and oxygen vacancies more readily form on encapsulated Ir than on pristine ceria.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
- Grant/Contract Number:
- AC02-05CH11231; SC0001004
- OSTI ID:
- 2204826
- Journal Information:
- Chem Catalysis, Journal Name: Chem Catalysis Journal Issue: 11 Vol. 3; ISSN 2667-1093
- Publisher:
- Cell PressCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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