| Numéro |
J. Phys. IV France
Volume 7, Numéro C2, Avril 1997
Proceedings of the 9th International Conference on X-Ray Absorption Fine Structure
|
|
|---|---|---|
| Page(s) | C2-895 - C2-896 | |
| DOI | https://doi.org/10.1051/jp4:1997269 | |
Proceedings of the 9th International Conference on X-Ray Absorption Fine Structure
J. Phys. IV France 7 (1997) C2-895-C2-896
DOI: 10.1051/jp4:1997269
1 Instituto de Catálisis y Petroleoquímica, CSIC, Campus Cantoblanco, 28049 Madrid, Spain
2 Chemical Engineering Department, Yale University, 9 Hillhouse Avenue, New Haven, CT06520-8286, U.S.A.
© EDP Sciences 1997
J. Phys. IV France 7 (1997) C2-895-C2-896
DOI: 10.1051/jp4:1997269
Phase Behavior of a Pd-Cu Bimetallic Catalyst During Temperature-Programmed Reduction
M. Fernández-García1 and G.L. Haller21 Instituto de Catálisis y Petroleoquímica, CSIC, Campus Cantoblanco, 28049 Madrid, Spain
2 Chemical Engineering Department, Yale University, 9 Hillhouse Avenue, New Haven, CT06520-8286, U.S.A.
Abstract
The phase behavior of a 1%Pd-0.5%Cu bimetallic catalyst during reduction has been followed by X-ray absorption near-edge structure (XANES). The analysis of the XANES spectra by Factor Analysis was used to determine that after calcination the active components are hosted in three different phases : a Cu-Pd mixed oxide, PdO and Cun+ ions exchanged into L-zeolite positions. At the Pd K-edge, an intermediate compound is detected in the reduction process. The reduction of the catalyst yields only one phase, a substitutionally disordered Pd50Cu50 alloy.
© EDP Sciences 1997