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题名: Dynamic Structural Changes of SiO2 Supported Pt-Ni Bimetallic Catalysts over Redox Treatments Revealed by NMR and EPR
作者: Xu, Suochang1, 2, 3, 5;  Walter, Eric D.2, 3;  Zhao, Zhenchao2, 3, 4;  Hu, Mary Y.2, 3;  Han, Xiuwen1;  Hu, Jian Zhi2, 3;  Bao, Xinhe1
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
发表日期: 2015-09-10
DOI: 10.1021/acs.jpcc.5b06344
卷: 119, 期:36, 页:21219-21226
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: SiO2 supported Pt-Ni bimetallic catalysts with different nickel loadings were prepared and their structural changes after redox treatments were studied by XRD, NMR, and EPR. It is found that the paramagnetic Ni species are mainly located on the surface of silica lattice. The relaxation of detected Si-29 nuclei in our samples is mainly governed by a spin-diffusion mechanism. The paramagnetic effects are reflected in the spin lattice relaxation of Q(4) species, with the oxidized samples presenting faster relaxation rates than the corresponding reduced ones. Meanwhile the Q(3) species, which are in close contact with the paramagnetic nickel centers, are "spectrally invisible". In reducing atmosphere Ni gradually diffuses into Pt NPs to form PtNi alloys. While under oxidization treatment, the alloyed Ni atoms migrate outward from the core of Pt NPs and are oxidized. The main EPR spectrum results from reduced nickel species, and the reduced samples show stronger EPR signal than the corresponding oxidized ones. However, in the reduced samples, the superparamagnetic or ferromagnetic metallic Ni particles were inside the PtNi NPs, making their influence on the Si-29 relaxation in the SiO2 support weaker than the oxidized samples.
关键词[WOS]: CORE-SHELL NANOPARTICLES ;  SOLID-STATE NMR ;  ELECTRON-PARAMAGNETIC-RESONANCE ;  SPIN-LATTICE-RELAXATION ;  ALLOY NANOPARTICLES ;  PLATINUM CATALYSTS ;  AT-PT ;  REACTIVITY ;  REDUCTION ;  OXIDATION
语种: 英语
WOS记录号: WOS:000361255100049
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/146538
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Pacific NW Natl Lab, Inst Integrated Catalysis, Richland, WA 99354 USA
3.Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99354 USA
4.Xiamen Univ, Collaborat Innovat Ctr Chem Energy Mat, Xiamen 361005, Peoples R China
5.Univ Chinese Acad Sci, Beijing 100039, Peoples R China

Recommended Citation:
Xu, Suochang,Walter, Eric D.,Zhao, Zhenchao,et al. Dynamic Structural Changes of SiO2 Supported Pt-Ni Bimetallic Catalysts over Redox Treatments Revealed by NMR and EPR[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2015,119(36):21219-21226.
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