Structure and Catalytic Performance of Pt−Cu Bimetallic Catalysts Synthesized by a Radiation-Induced Reduction Method in the Aqueous Phase: Influence of Support Material and Sulfate Ion in the Precursor
Structure and Catalytic Performance of Pt−Cu Bimetallic Catalysts Synthesized by a Radiation-Induced Reduction Method in the Aqueous Phase: Influence of Support Material and Sulfate Ion in the Precursor
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DOI：
10.1021/jp311600y
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发表时间：
2013-03
影响因子：
3.7
通讯作者：
J. Kugai;Toshiharu Moriya;S. Seino;T. Nakagawa;Y. Ohkubo;H. Nitani;K. Ueno;T. Yamamoto
中科院分区：
文献类型：
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作者：
J. Kugai;Toshiharu Moriya;S. Seino;T. Nakagawa;Y. Ohkubo;H. Nitani;K. Ueno;T. Yamamoto
纳米粒子的结构对催化剂的性能有很大的影响。通过水相中金属离子的辐射还原反应，合成了不同铜负载量、载体材料和铜源的负载型Pt-Cu催化剂。这些参数对Pt-Cu纳米粒子的结构性质有很大的影响。在炭黑上，铂铜合金纳米粒子易于形成，氧化物相较少。在CeO 2载体上，Pt-Cu在低Cu区域（Cu/Pt 1）高度氧化。从两种不同的铜源（CuSO 4和CuCl 2）获得的CeO 2-负载型催化剂的结构表明，氧化态的这种剧烈变化是两种竞争效应的结果，CeO 2对金属的氧化和硫酸根离子使它们稳定在金属态。CO优先氧化的反应特征反映了Pt-Cu结构（氧化态）决定了CO的选择性。
The structure of bimetallic nanoparticles has a great impact on catalytic performance. By radiation-induced reduction of metal ions in the aqueous phase, supported bimetallic Pt–Cu catalysts were synthesized with various Cu loadings, support materials, and copper sources. These parameters had a great impact on the structural properties of Pt–Cu nanoparticles. On carbon black, Pt–Cu alloy nanoparticles were readily formed with little oxide phase. On CeO2 support, Pt–Cu was highly oxidized for the low-Cu region (Cu/Pt 1). The structure of CeO2-supported catalysts obtained from two different copper sources (CuSO4 and CuCl2) suggested that such a drastic change in oxidation state is the result of two competing effects, CeO2 to oxygenate metals and the sulfate ion to stabilize them in the metallic state. The reaction characteristics in preferential CO oxidation reflected the Pt–Cu structure (oxidation state) dete...