Phase Behavior of a Pd-Cu Bimetallic Catalyst During Temperature-Programmed Reduction

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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

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