Structural analysis of polymer-protected Pd/Pt bimetallic clusters as dispersed catalysts by using extended x-ray absorption fine structure spectroscopy

Journal Article · Thu Sep 19 00:00:00 EDT 1991 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100172a061· OSTI ID:5225718

Toshima, Naoki; Harada, Masafumi; Yonezawa, Tetsu; Kushihashi, Kakuta; Asakura, Kiyotaka ^[1]

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1. 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), Vol. 95:19; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
02 PETROLEUM
08 HYDROGEN
PALLADIUM
MOLECULAR STRUCTURE
X-RAY SPECTROSCOPY
PLATINUM
POLYMERS
CATALYSTS
COLLOIDS
CYCLOALKENES
EXPERIMENTAL DATA
HETEROGENEOUS CATALYSIS
HYDROGENATION
PYRROLIDONES
VINYL MONOMERS
ALKENES
AMIDES
AZOLES
CATALYSIS
CHEMICAL REACTIONS
DATA
DISPERSIONS
ELEMENTS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
INFORMATION
LACTAMS
METALS
MONOMERS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PLATINUM METALS
PYRROLES
SPECTROSCOPY
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties
020400 - Petroleum- Processing
080106 - Hydrogen- Production- Biosynthesis & Photochemical Processes