Structural analysis of polymer-protected Pd/Pt bimetallic clusters as dispersed catalysts by using extended x-ray absorption fine structure spectroscopy
- Univ. of Tokyo (Japan)
Extended X-ray absorption fine structure (EXAFS) was applied to the determination of the structure of colloidal dispersions of the poly (N-vinyl-2-pyrrolidone)-protected palladium/platinum bimetallic clusters, which work as the catalysts for selective partial hydrogenation of 1,3-cyclooctadiene to cyclooctene. The catalytic activity was found to depend on the structure of the bimetallic clusters. The EXAFS data on the Pd/Pt (4/1) bimetallic clusters, which are the most active catalysts, indicate a Pt core structure, in which the 42 Pd atoms are on the surface of the cluster particle and 13 Pt atoms are at the center of the particle, forming a core. In contrast, the Pd/Pt (1/1) bimetallic clusters are suggested to have a modified Pt core structure, in which 28 Pt atoms connect directly with each other, being located both in the core and on the surface, and 27 Pd atoms form three islands on the surface of the cluster particle. These bimetallic clusters work as active catalysts for selective hydrogenation of olefins, selective partial hydrogenation of diene to monoene, and visible light-induced hydrogen generation from water.
- OSTI ID:
- 5225718
- Journal Information:
- Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 95:19; ISSN JPCHA; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKENES
AMIDES
AZOLES
CATALYSIS
CATALYSTS
CHEMICAL REACTIONS
COLLOIDS
CYCLOALKENES
DATA
DISPERSIONS
ELEMENTS
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
HETEROGENEOUS CATALYSIS
HYDROCARBONS
HYDROGENATION
INFORMATION
LACTAMS
METALS
MOLECULAR STRUCTURE
MONOMERS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PALLADIUM
PLATINUM
PLATINUM METALS
POLYMERS
PYRROLES
PYRROLIDONES
SPECTROSCOPY
TRANSITION ELEMENTS
VINYL MONOMERS
X-RAY SPECTROSCOPY