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Trend of catalytic activity of CO oxidation on Rh and Ru nanoparticles: Role of surface oxide

Paper ID Volume ID Publish Year Pages File Format Full-Text
55514 47056 2012 7 PDF Available
Title
Trend of catalytic activity of CO oxidation on Rh and Ru nanoparticles: Role of surface oxide
Abstract

Recent studies suggest that surface oxides on transition metal nanoparticles play an important role in determining the catalytic activity of CO oxidation. In this work, we investigated the influence of surface modification of Rh and Ru nanoparticles on the catalytic activity of CO oxidation using UV-ozone surface treatment. Monodisperse Rh and Ru nanoparticles were synthesized by polyol reduction using poly(vinylpyrrolidone) (PVP) as a capping agent. The size of the nanoparticles was controlled by varying the concentration of the Rh and Ru precursors or using the seeded-growth method. The changes that occurred during UV-ozone surface treatment were characterized with X-ray photoelectron spectroscopy, which showed that the oxidation state increased after surface treatment. The catalytic activity and activation energy of Rh and Ru nanoparticle arrays were measured before and after the chemical modification. Our reaction studies indicate that the turnover rate of CO oxidation on Rh nanoparticles increases by a factor of three after UV-ozone treatment due to the formation of catalytically active Rh oxide. In contrast, the catalytic activity of Ru nanoparticles decreases after UV-ozone treatment, suggesting that the Ru bulk oxide formed during UV-ozone treatment is catalytically inactive. The results suggest an intriguing way to tune catalytic activity via engineering of the nanoscale surface oxide.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (258 K)Download as PowerPoint slideHighlights► We investigated catalytic activity of CO oxidation on Rh and Ru nanoparticle arrays. ► The catalytic activity and activation energy before and after the chemical modification. ► The changes in oxidation states that occurred during UV-ozone surface treatment were characterized with XPS. ► Rh oxide formed during UV-ozone treatment is reactive while Ru bulk oxide is catalytically inactive.

Keywords
CO oxidation; Rh and Ru nanoparticles; Oxidation state; UV-ozone surface treatment; Catalytic activity
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Trend of catalytic activity of CO oxidation on Rh and Ru nanoparticles: Role of surface oxide
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 185, Issue 1, 20 May 2012, Pages 131–137
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