Structure of bimetallic clusters. Extended x-ray absorption fine structure (EXAFS) studies of Ir--Rh clusters

Journal Article · Tue Mar 01 04:00:00 EST 1983 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.445006· OSTI ID:6386328

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

The extended x-ray absorption fine structures (EXAFS) associated with the L/sub III/ absorption edge of iridium and the K absorption edge of rhodium were investigated for catalysts containing bimetallic clusters of these elements dispersed on silica or alumina. The catalysts contained 1 wt.% iridium and 0.5 wt.% rhodium, which corresponds to an Ir/Rh atomic ratio close to 1. From the EXAFS data, it is concluded that the rhodium concentration in the surface region of the iridium--rhodium clusters is greater than it is in the interior. The EXAFS data also indicate that the iridium--rhodium clusters are more highly dispersed on alumina than on silica.

• Research Organization: Corporate Research Science Laboratories, Exxon Research and Engineering Company, Linden, New Jersey 07036
• OSTI ID: 6386328
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 78:5; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
AGGLOMERATION
CATALYSTS
ELEMENTS
FINE STRUCTURE
IRIDIUM
METALS
PLATINUM METALS
RHODIUM
SPECTRA
TRANSITION ELEMENTS
X-RAY SPECTRA