Active Metal–Oxide Interfaces in Supported Pt–Cu/CeO2 and Mechanically Mixed Pt–Cu+CeO2 Catalysts Synthesized by an Electron Beam Irradiation Method for Selective CO Oxidation
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Pt–Cu supported on CeO2 and mechanically mixed with CeO2 were synthesized using an electron beam irradiation method to probe the active metal–oxide interfaces for catalytic CO preferential oxidation. The lack of activity for the mechanical mixture of Pt with CeO2 showed the metal–CeO2 interface is critical for monometallic Pt. The comparable activity for the CeO2-supported Pt–Cu and mechanical mixture of Pt–Cu with CeO2 suggested platinum–copper contact as a new active site for bimetallic Pt–Cu. A non-linear increase of activity along the Cu content in catalyst and the Cu–O bonds detected in XANES spectra in the reaction condition at 100 °C suggested the presence of CuOx on the Pt–Cu alloy surface as strong chemisorption sites for oxygen.
KeywordsPt–Cu Bimetallic catalyst Metal–oxide interface Preferential oxidation PROX Electron beam irradiation
The authors thank Mr. K. Ueno (EBIS, Japan) for the provision of beam time for the electron accelerator. The authors thank partial support from the Ministry of Education, Culture, Sports, Science and Technology of Japan (Grant-in-Aid No. 22241023) and Ministry of Economy, Trade and Industry (R&D Project for Regional Innovation No. 22U5009).
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