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Catalytic performance of core–shell and alloy Pd–Au nanoparticles for total oxidation of VOC: The effect of metal deposition

Paper ID Volume ID Publish Year Pages File Format Full-Text
46466 46440 2012 7 PDF Available
Title
Catalytic performance of core–shell and alloy Pd–Au nanoparticles for total oxidation of VOC: The effect of metal deposition
Abstract

The catalytic properties of palladium and gold nanoparticles deposited on mesoporous TiO2 are investigated in toluene and propene oxidation. The catalysts, containing Pd and Au deposited on mesoporous TiO2 have been prepared by different order of metal deposition (Pd(shell)–Au(core)/TiO2, Pd–Au(alloy)/TiO2 and Au(shell)–Pd(core)/TiO2. For both toluene and propene oxidation reactions, the catalytic activity was found significantly higher when palladium is deposited on already-deposited gold (Pd(shell)–Au(core)/TiO2). This enhanced activity could be explained by the core–shell morphology (Pd–shell and Au-core) observed by UV–vis spectra, TPR profiles and XPS spectra. It was suggested that the oxidation reaction follows a Langmuir–Hinshelwood mechanism where the molecules of oxygen and VOC are in competition for adsorption on the surface of catalyst. Operando DRIFT spectroscopy was carried out to test the catalytic activity in a mixture of volatile organic compounds (toluene and propene). It was demonstrated that there is a competition between the molecules of VOC for adsorption but also the toluene has an inhibition effect for oxidation of propene.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Pd(shell)–Au(core)/TiO2, Au(shell)–Pd(core)/TiO2 and Pd–Au(alloy)/TiO2 catalysts for VOC oxidation. ► Higher activity of Pd(shell)–Au(core)/TiO2. ► Competition observed by operando DRIFT for adsorption between toluene and propene molecules. ► Mechanism of oxidation proceeds through preferential adsorption of oxygen than VOC.

Keywords
VOC oxidation; Palladium; Gold; Mesoporous TiO2; Core–shell; Alloy; UV–vis diffraction; Operando DRIFT; TPR
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Catalytic performance of core–shell and alloy Pd–Au nanoparticles for total oxidation of VOC: The effect of metal deposition
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 111–112, 12 January 2012, Pages 218–224
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us