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A Metastable State Facilitates Low Temperature CO Oxidation over Pt Nanoparticles
Samantha L Le1,2, Christopher R O'Connor1, Taek-Seung Kim1,3
1Rowland Institute at Harvard, Harvard University, Cambridge, MA, USA.
Angewandte Chemie (International Ed. in English)
|January 14, 2025
Summary
Researchers created a highly active platinum (Pt) nanoparticle surface state for catalysis by thermally treating carbon monoxide (CO)-covered Pt. This metastable state efficiently oxidizes CO to carbon dioxide (CO2) at room temperature.
Area of Science:
- Surface science and catalysis research.
- Nanoparticle material science and surface chemistry.
Background:
- Heterogeneous catalytic materials exhibit dynamic surface states influenced by their environment, potentially enhancing catalytic activity.
- Metallic nanoparticles, such as platinum (Pt), are crucial in various catalytic applications.
Purpose of the Study:
- To investigate the generation and characteristics of a high-activity surface state on platinum nanoparticles.
- To understand the conditions and mechanisms leading to enhanced catalytic performance in CO oxidation.
Main Methods:
- Utilized thermal treatment on carbon monoxide (CO)-covered 2 nm Pt nanoparticles.
- Employed pressure pulse experiments combined with in situ spectroscopy.
- Analyzed CO oxidation to carbon dioxide (CO2) at room temperature.
Main Results:
- Successfully generated a metastable surface state on Pt nanoparticles with significantly increased catalytic activity.
- This state facilitates the oxidation of CO to CO2 at room temperature.
- Formation of the high-activity state correlates with the desorption of weakly bound CO from specific Pt sites.
Conclusions:
- A novel, metastable, high-activity surface state can be generated on Pt nanoparticles via thermal treatment of CO-covered catalysts.
- This state is localized to the nanoparticle surface and is sensitive to thermal stress and CO re-adsorption.
- The precise atomic structure of this metastable state requires further investigation.
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