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Carbon oxidation with Ag/ceria prepared by self-dispersion of Ag powder into nano-particles

Paper ID Volume ID Publish Year Pages File Format Full-Text
55726 47063 2011 7 PDF Available
Title
Carbon oxidation with Ag/ceria prepared by self-dispersion of Ag powder into nano-particles
Abstract

This study reports a unique and novel method of preparation of Ag/CeO2 catalyst for carbon oxidation. A calcination of physical mixture of Ag metal powder and CeO2 at 500 °C results in self-dispersion of Ag into nano-particles on CeO2. From TEM images, the average diameter of Ag particles in Ag power before calcination was around 66 nm, while the particle size of Ag became smaller around 8 nm with very narrow distribution. Oxygen vacancy on CeO2 surface is suggested to play an important role in the self-dispersion of Ag. The obtained catalyst showed high activity for soot oxidation comparable to Ag/CeO2 prepared by impregnation method. The promotion effect of CeO2 was not observed in physical mixtures with Cu, Au and Pt. Mechanical mixtures of Ag and various metal oxide supports were also examined. The addition of Ag to CeO2, SnO2, ZrO2, ZnO, TiO2, and Nb2O5 significantly lowered the temperature of carbon oxidation than those of supports, while that to Co3O4, CaO, La2O3, NiO, SiO2, Al2O3 and MgO did not.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (172 K)Download as PowerPoint slideHighlights► A calcination of physical mixture of Ag metal powder and CeO2 at 500 °C results in self-dispersion of Ag into nano-particles. ► The obtained catalyst showed high activity for soot oxidation comparable to Ag/CeO2 prepared by impregnation method. ► A key role of oxygen vacancy of CeO2 surface on the self-dispersion was suggested.

Keywords
Carbon oxidation; Silver; Ceria; Self-dispersion; DPF
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 175, Issue 1, 25 October 2011, Pages 93–99
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