Science (American Association for the Advancement of Science), 1996-10, Vol.274 (5286), p.413-415
1996
Volltextzugriff (PDF)
Details
- Autor(en) / Beteiligte
- Titel
- Direct Imaging of the Atomic Configuration of Ultradispersed Catalysts
- Ist Teil von
- Science (American Association for the Advancement of Science), 1996-10, Vol.274 (5286), p.413-415
- Ort / Verlag
- Washington, DC: American Society for the Advancement of Science
- Erscheinungsjahr
- 1996
- Quelle
- Alma/SFX Local Collection
- Beschreibungen/Notizen
- Direct imaging of individual catalyst metal atoms on the insulating surface of an industrial support is demonstrated. Individual platinum and rhodium atoms ultradispersed on γ-Al$_2$O$_3$ supports were imaged by high-resolution Z-contrast (atomic number Z) microscopy in a 300-kilovolt scanning transmission electron microscope. Within small clusters, the configuration of the metal atoms was seen to be constrained to match the surface structure of the γ-Al$_2$O$_3$, from which likely surface adsorption sites were deduced. A thin, extended raft of rhodium atoms was observed, mostly corresponding to one monolayer. Occasional two-atom features suggested partial dissolution into the top layers of the γ-Al$_2$O$_3$ support.
- Sprache
- Englisch
- Identifikatoren
- ISSN: 0036-8075eISSN: 1095-9203DOI: 10.1126/science.274.5286.413Titel-ID: cdi_proquest_miscellaneous_743171667
- Format
- –
- Schlagworte
- Atoms, Atoms & subatomic particles, Catalysts, Dimers, Document imaging, Electron, positron and ion microscopes, electron diffractometers and related techniques, Exact sciences and technology, Image contrast, Imaging, Instruments, apparatus, components and techniques common to several branches of physics and astronomy, Laboratory Equipment, Materials, Metal catalysts, Metals, Microscopes, Observations, Physics, Rafts, Rhodium, Scientific Concepts, Scientific imaging, Surface Structure, Transmission electron microscopes, Trimers