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
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
复制标题
电子束辐照法合成的负载型 Pt-Cu/CeO2 和机械混合 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
DOI：
10.1007/s10562-013-1051-1
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
T. A.
中科院分区：
文献类型：
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作者：
Seino;S.; Nakagawa;T.; Nitani;H.; Yamamoto;T. A.
用电子束辐照的方法合成了CeO2负载和机械混合的铂-铜催化剂，探索了催化CO优先氧化的活性金属-氧化物界面。铂与CeO2的机械混合物缺乏活性，这表明金属-CeO2界面是单金属铂的关键。CeO_2负载的铂-铜催化剂和铂-铜与CeO_2机械混合物的活性相当，表明铂-铜接触是双金属铂-铜的一个新的活性中心。在100℃的反应条件下，随着催化剂中的铜含量和XANES谱中检测到的铜-氧键的非线性增加，活性增加，这表明在铂-铜合金表面上存在铜氧作为氧的强化学吸附中心。
AbstractPt–Cu supported on CeO2and mechanically mixed with CeO2were 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 CeO2showed the metal–CeO2interface is critical for monometallic Pt. The comparable activity for the CeO2-supported Pt–Cu and mechanical mixture of Pt–Cu with CeO2suggested 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 CuOxon the Pt–Cu alloy surface as strong chemisorption sites for oxygen.Graphical Abstract