催化作用
金属
铂金
材料科学
吸附
氧化态
相(物质)
氧气
化学工程
无机化学
化学
光化学
物理化学
冶金
有机化学
工程类
作者
Frédéric Meunier,Luis Cárdenas,Helena Kaper,Břetislav Šmíd,Mykhailo Vorokhta,Rémi Grosjean,Daniel Aubert,Kassiogé Dembélé,Thomas Lunkenbein
标识
DOI:10.1002/anie.202013223
摘要
Abstract 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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