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首页> 外文期刊>Catalysis Letters >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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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

机译:负载的Pt-Cu / CeO2和通过电子束辐照法合成的机械混合Pt-Cu + CeO2催化剂中的活性金属氧化物界面用于选择性CO氧化

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摘要

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-0 bonds detected in XANES spectra in the reaction condition at 100 °C suggested the presence of CuO_x on the Pt-Cu alloy surface as strong chemisorption sites for oxygen. KPt-Cu;; Bimetallic catalyst;; Metal-oxide interface;; Preferential oxidation;; PROX;; Electron beam irradiation
机译:利用电子束辐照法合成了负载在CeO2上并与CeO2机械混合的Pt-Cu,以探测活性金属-氧化物界面,以催化CO优先氧化。 Pt与CeO2的机械混合物缺乏活性,表明金属-CeO2界面对于单金属Pt至关重要。 CeO2负载的Pt-Cu的可比活性以及Pt-Cu与CeO2的机械混合物的可比性表明,铂-铜接触是双金属Pt-Cu的新活性位。在100°C的反应条件下,沿催化剂中Cu含量和XANES光谱中检测到的Cu-0键的活性呈非线性增加,表明Pt-Cu合金表面上存在CuO_x作为强的化学吸附氧位。 K Pt-Cu ;;双金属催化剂;金属氧化物界面;优先氧化;代理;;电子束照射

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