Structural and electronic characterization of supported Ni and Au catalysts used in environment protection determined by XRD, XAS and XPS methods
Autor(en): | Aldea, N. Rednic, V. Matei, F. Hu, T. Neumann, M. |
Stichwörter: | Atomic numbers; Atoms; AU catalysts; Average particle size; Electron transitions; Electronic characterization; Electronic structure; Environment protection; EXAFS; Fermi functions; Global structure; Gold nanocluster; Local and global structure; Local structure; Mean square; Metal-support interaction; Metal-support interactions; Metals; Micro-strain; Particle size analysis; Photoelectron spectroscopy; Probability densities; Shape change; Supported metal catalysts; Supported-metal catalysts; Synchrotron radiation; X ray diffraction; X ray photoelectron spectroscopy, Catalyst supports; X-ray absorption spectroscopy; X-ray diffraction; X-ray line profile; X-ray photoelectron spectroscopy; XRD, Absorption spectroscopy | Erscheinungsdatum: | 2011 | Journal: | World Academy of Science, Engineering and Technology | Volumen: | 79 | Startseite: | 559 | Seitenende: | 565 | Zusammenfassung: | The nickel and gold nanoclusters as supported catalysts were analyzed by XAS, XRD and XPS in order to determine their local, global and electronic structure. The present study has pointed out a strong deformation of the local structure of the metal, due to its interaction with oxide supports. The average particle size, the mean squares of the microstrain, the particle size distribution and microstrain functions of the supported Ni and Au catalysts were determined by XRD method using Generalized Fermi Function for the X-ray line profiles approximation. Based on EXAFS analysis we consider that the local structure of the investigated systems is strongly distorted concerning the atomic number pairs. Metal-support interaction is confirmed by the shape changes of the probability densities of electron transitions: Ni K edge (1s → continuum and 2p), Au L III-edge (2p 3/2 → continuum, 6s, 6d 5/2 and 6d 3/2). XPS investigations confirm the metal-support interaction at their interface. |
ISSN: | 2010376X | Externe URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-79960813517&partnerID=40&md5=31cfed152a89489ea5aedd385fd48444 |
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