Structure of bimetallic clusters. Extended x-ray absorption fine structure (EXAFS) of Pt--Re and Pd--Re clusters

Journal Article · Tue Dec 01 04:00:00 EST 1987 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.453465· OSTI ID:6049071

Meitzner, G; Via, G H; Lytle, F W; Sinfelt, J H

Extended x-ray absorption fine structure (EXAFS) studies were conducted on catalysts containing platinum and rhenium, or palladium and rhenium, on alumina. The atomic ratio of rhenium to either platinum or palladium was close to one in the catalysts investigated. The metallic entities in the catalysts were characterized by analyses of the EXAFS associated with the L/sub I/ absorption edge of platinum, the L/sub III/ edge of rhenium, and the K absorption edge of palladium. It was concluded that Pt--Re and Pd--Re bimetallic clusters are present in the catalysts. However, the clusters have regions rich in rhenium and other regions which are rich in either platinum or palladium. Exposure of Pt--Re clusters to sulfur has little influence on their structure.

• Research Organization: Corporate Research Science Laboratories, Exxon Research and Engineering Company, Annandale, New Jersey 08801
• OSTI ID: 6049071
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 87:11; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
CATALYSTS
CRYSTAL STRUCTURE
ELEMENTS
METALS
MICROSTRUCTURE
PALLADIUM
PLATINUM
PLATINUM METALS
RHENIUM
SPECTROSCOPY
STRUCTURE FACTORS
TRANSITION ELEMENTS
X-RAY SPECTROSCOPY