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

作者：Kugai Junichiro^*; Moriya Toshiharu; Seino Satoshi; Nakagawa Takashi; Ohkubo Yuji; Nitani Hiroaki; Yamamoto Takao A

来源：Catalysis Letters, 2013, 143(11): 1182-1187.

DOI：10.1007/s10562-013-1051-1

• Pt-Cu
• Bimetallic catalyst
• Metal-oxide interface
• Preferential oxidation
• PROX
• Electron beam irradiation

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 A degrees C suggested the presence of CuOx on the Pt-Cu alloy surface as strong chemisorption sites for oxygen.

• 出版日期2013-11