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Promotional effect of metal encapsulation on reactivity of iron oxide supported Pt catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
41663 45895 2011 4 PDF Available
Title
Promotional effect of metal encapsulation on reactivity of iron oxide supported Pt catalysts
Abstract

We studied reactivity of well-defined Pt model catalysts, supported on crystalline iron oxide Fe3O4(1 1 1) films, in low temperature CO oxidation. It is shown that pre-annealing in vacuum at ∼850 K suppresses CO adsorption but increases CO2 production rate. This finding is rationalised in terms of strong metal–support interaction between Pt and iron oxide resulting in particles encapsulation by a thin FeO(1 1 1) film that catalyses CO oxidation similarly to the extended FeO(1 1 1)/Pt(1 1 1) surfaces previously studied [10]. The results show that the stability and the atomic structure of the encapsulated layer under reaction conditions play a critical role in oxidation reactions over Pt catalysts supported on reducible oxides.

Graphical abstractHigh-temperature annealing of Pt particles supported on Fe3O4(1 1 1) films is shown to result in particles encapsulation by an ultra-thin FeO film which greatly enhances low temperature CO oxidation.Figure optionsDownload full-size imageDownload high-quality image (47 K)Download as PowerPoint slide

Keywords
Platinum; Iron oxides; Strong metal–support interaction; CO oxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 391, Issues 1–2, 4 January 2011, Pages 407–410
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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Price after discount Only $4.95
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Full-text PDF Download
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