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CO oxidation at low temperature on Au/CePO4: Mechanistic aspects

Paper ID Volume ID Publish Year Pages File Format Full-Text
46883 46452 2011 6 PDF Available
Title
CO oxidation at low temperature on Au/CePO4: Mechanistic aspects
Abstract

This work reports the synthesis and characterization of a cerium phosphate supported gold catalyst as well as its catalytic activity for the oxidation of CO. A precipitation method in the presence of an organic modifier followed by a hydrothermal treatment was used for the support synthesis, resulting in high surface area nanometric particles. Gold/cerium phosphate catalyst with a 1% (w/w) nominal gold content was characterized using XRF, XRD, N2 adsorption–desorption measurements, TEM and DRIFTS-MS. The catalyst shows good catalytic activity at low temperature. The activity is related to the generation of oxygen vacancies in the support caused by the elimination of structural oxygen. In situ studies revealed that the reaction of the oxygen vacancies with gaseous oxygen resulted in the formation of peroxo species. These species are responsible for the activity detected at room temperature in both the catalyst and the support. Moreover, the presence of carbonate and hydrogen carbonate acting as reaction intermediates have been observed.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► CePO4 (rhabdophane structure) is used as support of gold catalysts for CO oxidation. ► Dehydration of the support during activation induces oxygen vacancies generation. ► Oxygen vacancies are able to react with gaseous oxygen to give peroxide species. ► Peroxides oxidize CO at low temperature giving carbonates that poison surface sites. ► By rising temperature, when gold is present, carbonates decompose and activity rises.

Keywords
Gold; Cerium phosphate; CO oxidation; DRIFTS; Peroxides
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CO oxidation at low temperature on Au/CePO4: Mechanistic aspects
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 107, Issues 3–4, 21 September 2011, Pages 268–273
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