Dynamic structure of active sites in ceria-supported Pt catalysts for the water gas shift reaction
| Autor: | Anatoly I. Frenkel, Matthew Kottwitz, Joshua L. Vincent, Michael J. Enright, Lihua Zhang, Wei-Chang Yang, Ralph G. Nuzzo, Peter A. Crozier, Yuanyuan Li, Jiahao Huang, Zongyuan Liu, Sanjaya D. Senanayake |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Catalytic transformation
Active structure Hydrogen Science General Physics and Astronomy chemistry.chemical_element engineering.material 010402 general chemistry 01 natural sciences General Biochemistry Genetics and Molecular Biology Water-gas shift reaction Article Catalysis Chemical engineering High activity Heterogeneous catalysis Multidisciplinary 010405 organic chemistry General Chemistry 0104 chemical sciences chemistry Chemical physics engineering Nanoparticles Noble metal Selectivity |
| Zdroj: | Nature Communications Nature Communications, Vol 12, Iss 1, Pp 1-9 (2021) |
| ISSN: | 2041-1723 |
| Popis: | Oxide-supported noble metal catalysts have been extensively studied for decades for the water gas shift (WGS) reaction, a catalytic transformation central to a host of large volume processes that variously utilize or produce hydrogen. There remains considerable uncertainty as to how the specific features of the active metal-support interfacial bonding—perhaps most importantly the temporal dynamic changes occurring therein—serve to enable high activity and selectivity. Here we report the dynamic characteristics of a Pt/CeO2 system at the atomic level for the WGS reaction and specifically reveal the synergistic effects of metal-support bonding at the perimeter region. We find that the perimeter Pt0 − O vacancy−Ce3+ sites are formed in the active structure, transformed at working temperatures and their appearance regulates the adsorbate behaviors. We find that the dynamic nature of this site is a key mechanistic step for the WGS reaction. Revealing the structure and dynamics of active sites is essential to understand catalytic mechanisms. Here the authors demonstrate the dynamic nature of perimeter Pt0−O vacancy−Ce3+ sites in Pt/CeO2 and the key effects of their dynamics on the mechanism of the water gas shift reaction. |
| Databáze: | OpenAIRE |
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