Synergy between Metallic and Oxidized Pt Sites Unravelled during Room Temperature CO Oxidation on Pt/Ceria
Status PubMed-not-MEDLINE Jazyk angličtina Země Německo Médium print-electronic
Typ dokumentu časopisecké články
Grantová podpora
AAP 22 Airclean
Fonds Unique Interministériel
20187010
CERIC-ERIC
20-13573S
Czech Science Foundation
PubMed
33105066
DOI
10.1002/anie.202013223
Knihovny.cz E-zdroje
- Klíčová slova
- NAP-XPS, operando DRIFTS, platinum, room temperature CO oxidation, structure-reactivity relationship,
- Publikační typ
- časopisecké články MeSH
Pt-based materials are widely used as heterogeneous catalysts, in particular for pollutant removal applications. The state of Pt has often been proposed to differ depending on experimental conditions, for example, metallic Pt poisoned with CO being present at lower temperature before light-off, while an oxidized Pt surface prevails above light-off temperature. In stark contrast to all previous reports, we show herein that both metallic and oxidized Pt are present in similar proportions under reaction conditions at the surface of ca. 1 nm nanoparticles showing high activity at 30 °C. The simultaneous presence of metallic and oxidized Pt enables a synergy between these phases. The main role of the metallic Pt phase is to provide strong adsorption sites for CO, while that of oxidized Pt supposedly supplies reactive oxygen. Our results emphasize the complex dual oxidic-metallic nature of supported Pt catalysts and platinum's evolving nature under reaction conditions.
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