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Dynamic Structural Changes of SiO2 Supported Pt-Ni Bimetallic Catalysts over Redox Treatments Revealed by NMR and EPR
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
Source PublicationJOURNAL OF PHYSICAL CHEMISTRY C
2015-09-10
DOI10.1021/acs.jpcc.5b06344
Volume119Issue:36Pages:21219-21226
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
WOS SubjectChemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
WOS Research AreaChemistry ; Science & Technology - Other Topics ; Materials Science
WOS KeywordCORE-SHELL NANOPARTICLES ; SOLID-STATE NMR ; ELECTRON-PARAMAGNETIC-RESONANCE ; SPIN-LATTICE-RELAXATION ; ALLOY NANOPARTICLES ; PLATINUM CATALYSTS ; AT-PT ; REACTIVITY ; REDUCTION ; OXIDATION
AbstractSiO2 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.
Language英语
WOS IDWOS:000361255100049
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/146538
Collection中国科学院大连化学物理研究所
Affiliation1.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
GB/T 7714
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.
APA Xu, Suochang.,Walter, Eric D..,Zhao, Zhenchao.,Hu, Mary Y..,Han, Xiuwen.,...&Bao, Xinhe.(2015).Dynamic Structural Changes of SiO2 Supported Pt-Ni Bimetallic Catalysts over Redox Treatments Revealed by NMR and EPR.JOURNAL OF PHYSICAL CHEMISTRY C,119(36),21219-21226.
MLA Xu, Suochang,et al."Dynamic Structural Changes of SiO2 Supported Pt-Ni Bimetallic Catalysts over Redox Treatments Revealed by NMR and EPR".JOURNAL OF PHYSICAL CHEMISTRY C 119.36(2015):21219-21226.
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