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Shape-regulation: An effective way to control CO oxidation activity over noble metal catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
55099 47040 2013 11 PDF Available
Title
Shape-regulation: An effective way to control CO oxidation activity over noble metal catalysts
Abstract

The polyhedral Pd and Pt nanocrystals with well-defined morphologies were synthesized via chemical reduction method in an aqueous or polyol system. The catalytic CO oxidation activities over the catalysts with the polyhedral Pd and Pt nanocrystals supported on SiO2 were evaluated. It was found that the CO oxidation activity over the Pd-O/SiO2 catalyst was higher than that over the Pd-C/SiO2 catalyst, and the dominative exposed Pd nanocrystal facet was (1 1 1) for the former and (1 0 0) for the later catalyst. The Pt-C/SiO2 catalyst loaded with Pt cube nanocrystals mainly exposing (1 0 0) facets showed higher CO oxidation activity than the Pt-O/SiO2 catalysts with the (1 1 1) plane as the mainly exposed facet. The investigation revealed that the Pd(1 1 1) and Pt(1 0 0) facets possessed appropriate CO adsorption strength that was responsible for the high activity of CO oxidation, whereas CO adsorption over the Pt(1 1 1) was so strong that the CO self-poisoning occurred over the Pt-O/SiO2 catalyst. The CO adsorption on the Pd(1 0 0) was so weak that the CO molecules could not be activated over the Pd-C/SiO2 sample. Thus, the CO oxidation over the Pt-O/SiO2 and Pd-C/SiO2 catalysts was suppressed.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (241 K)Download as PowerPoint slideHighlights► The palladium and platinum nanocrystals with different shapes were synthesized. ► The CO adsorption behavior on metal surface was studied by DRIFT spectra. ► Time-dependent DRIFT experiments were used to study the CO adsorption stability. ► The “adsorption strength–activity” relationship presented a volcano shape curve. ► Different mechanisms of CO oxidation over Pd and Pt nanocrystals supported catalysts were proposed.

Keywords
Shape; Nanocrystal; Palladium; Platinum; CO oxidation
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Shape-regulation: An effective way to control CO oxidation activity over noble metal catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 201, 1 March 2013, Pages 68–78
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