Room-Temperature CO Oxidation Catalyst: Low-Temperature Metal–Support Interaction between Platinum Nanoparticles and Nanosized Ceria

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• 作者：Suresh Gatla ; Daniel Aubert ; Giovanni Agostini ; Olivier Mathon ; Sakura Pascarelli ; Thomas Lunkenbein ; Marc Georg Willinger ; Helena Kaper
• 刊名：ACS Catalysis
• 出版年：2016
• 出版时间：September 2, 2016
• 年：2016
• 卷：6
• 期：9
• 页码：6151-6155
• 全文大小：314K
• 年卷期：0
• ISSN：2155-5435

文摘

Platinum nanoparticles dispersed on nanosized ceria are active for CO oxidation at room temperature after hydrogen pretreatment. High angular annular dark field scanning transmission electron microscopy (HAADF-STEM) analysis of the reduced catalyst shows spreading of the 1 nm sized platinum particles under the electron beam, characteristic for a two-dimensional strong metal–support interaction. In situ X-ray absorption fluorescence spectroscopy (XAFS) reveals a Pt–O distance of 2.1 Å, which is significantly longer than the Pt–O distance in PtO₂ (2.0 Å). This elongated Pt–O distance can be related to interaction of the platinum species with cerium oxide in the form of a low-temperature active species–support interaction. These findings contribute to the general understanding of catalytic systems operating at low temperature.