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Catalytic performance of supported Ag nano-particles prepared by liquid phase chemical reduction for soot oxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
54199 47000 2015 6 PDF Available
Title
Catalytic performance of supported Ag nano-particles prepared by liquid phase chemical reduction for soot oxidation
Abstract

•Spherically shaped Ag nano-particles exhibited high performance for soot oxidation.•Oxygen species adsorbed on Ag particles directly participates in soot oxidation.•Ag+ on the surface of Ag nano-particles can effectively activate oxygen species.

The effect of size and morphology of Ag catalysts supported on ZrO2 on the soot oxidation activity was investigated. Spherically shaped Ag nano-particles with the size of ca. 16 nm, prepared by liquid-phase chemical reduction, supported on ZrO2 (Ag/ZrO2(NP)) exhibited outstanding performance for soot oxidation with gaseous O2 in tight and loose contact modes, compared with hemispherically shaped Ag particles prepared by impregnation (Ag/ZrO2(IMP)). The exceptional performance of Ag/ZrO2(NP) for soot oxidation in loose contact mode was explained by relatively good catalyst-soot contact state and effective migration of active oxygen species from the catalyst to soot. In addition to morphological effect, Ag nano-particles supported on ZrO2 were found to be stabilized in the surface valence state of Ag+, and then oxygen species participating in soot oxidation can be effectively activated on Ag+ sites. We concluded that the presence of Ag+ sites on the surface of Ag nano-particles is responsible for high soot oxidation activity.

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Keywords
Soot oxidation; Silver; Nano-particles; Zirconium oxide; Morphology; Liquid phase chemical reduction
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Catalytic performance of supported Ag nano-particles prepared by liquid phase chemical reduction for soot oxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 242, Part B, 15 March 2015, Pages 351–356
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