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Oxidation of CO over Ru/Ceria prepared by self-dispersion of Ru metal powder into nano-sized particle

Paper ID Volume ID Publish Year Pages File Format Full-Text
55098 47040 2013 6 PDF Available
Title
Oxidation of CO over Ru/Ceria prepared by self-dispersion of Ru metal powder into nano-sized particle
Abstract

The oxidation of CO was performed using physical mixture of Ru metal powder and various metal oxide supports after calcination in air and reduction in H2. Among various supports (CeO2, ZrO2, MgO, Al2O3, TiO2, SnO2, and SiO2), only Ru + CeO2 showed very high catalytic activity for CO oxidation with the light-off temperature below 100 °C, which was comparable to Ru/CeO2 prepared by a conventional impregnation method. The optimum conditions for the preparation were loading amount of 2 wt%, calcination at 700 °C in air followed by reduction at 400 °C in 5%H2. It was revealed that the high catalytic activity for Ru + CeO2 is attributed to the high dispersion of Ru on CeO2. The original Ru metal powder having diameter of 36 nm was dispersed during the calcination leading into small Ru particles having diameter around 2 nm. Raman spectra indicated that the formation of RuOCe bond after the calcination is one of the key for the Ru dispersion. The self-dispersion of Ru was not achieved by the calcination in N2. It was proposed that the self-dispersion of Ru into nano-particles was caused by oxidation of Ru metal into Ru oxide in air, then dispersion of nano-sized Ru oxide by forming RuOCe bond, and finally conversion of Ru oxide particles into nano-sized Ru metal particles in a flow of H2.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (170 K)Download as PowerPoint slideHighlights► A physical mixing and calcination of Ru powder and CeO2 results in an active Ru/CeO2 catalyst. ► The activity was comparable to Ru/CeO2 by a conventional impregnation method. ► The high activity is caused by self-dispersion of Ru into nano-particle. ► The RuOCe bond formation was suggested to be a key factor for the self-dispersion.

Keywords
Ru; CeO2; Self-dispersion; Physical mixing; CO oxidation
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Oxidation of CO over Ru/Ceria prepared by self-dispersion of Ru metal powder into nano-sized particle
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 201, 1 March 2013, Pages 62–67
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