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Strong metal-support interaction and alloying in Pd/ZnO catalysts for CO oxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
53355 46964 2016 11 PDF Available
Title
Strong metal-support interaction and alloying in Pd/ZnO catalysts for CO oxidation
Abstract

•Reduction study of variously loaded, co-precipitated Pd/ZnO catalysts.•Investigation of SMSI formation and alloying.•Detailed surface and bulk characterization by XPS, IR, HR-TEM and XRD.•CO-oxidation as catalytic test reaction.

Pd/ZnO catalysts with different Pd content have been synthesized, thoroughly characterized and investigated with regard to their reduction behavior in hydrogen or carbon monoxide containing atmospheres, by applying CO-chemisorption, photoelectron spectroscopy, X-ray diffraction, electron microscopy, TPR and DRIFTS techniques. As a catalytic test reaction, CO-oxidation has been applied. The interaction of the noble metal with the support has been revealed in a way that can distinguish between alloying and other surface spreading/wetting phenomena, induced by strong metal-support interaction (SMSI). It was found that while alloy formation promoted CO-oxidation activity additional ZnOx formation by SMSI had the opposite effect. Zinc enrichment at the surface was detected during reduction of the catalysts, depending on the reducing agent and the Pd particle size.

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Keywords
Palladium; Zinc oxide; CO-oxidation; SMSI; Alloying; XPS
First Page Preview
Strong metal-support interaction and alloying in Pd/ZnO catalysts for CO oxidation
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 260, 1 February 2016, Pages 21–31
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis