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Preferential CO oxidation over nanosized gold catalysts supported on ceria and amorphous ceria–alumina

Paper ID Volume ID Publish Year Pages File Format Full-Text
46607 46443 2012 11 PDF Available
Title
Preferential CO oxidation over nanosized gold catalysts supported on ceria and amorphous ceria–alumina
Abstract

1 wt.% Au supported on CeO2–Al2O3 (Ce/Ce + Al: 0, 2, 5, 10, 15, and 20 mol%) was prepared by impregnation in organic medium of high-surface area supports prepared by Evaporation Induced Self Assembly (EISA) route. For comparison, a 1 wt.% Au/CeO2 was also prepared using a commercial support. All the prepared catalysts present a BET surface area roughly between 200 and 340 m2 g−1. The reducibility, the oxygen storage capacity (OSC) and the oxygen mobility determined by oxygen isotopic exchange (OIE) of the 1 wt.% Au/CeO2–Al2O3 are enhanced by the presence of gold and increases with the cerium content in the support. The values of the OSC and the oxygen mobility in the Au/CeO2–Al2O3 catalysts with high cerium loading are higher than those determined on their Au/CeO2 counterpart. The activity in CO oxidation of the Au/CeO2–Al2O3 catalysts increases with the cerium content in the support, which could be linked to the better oxygen mobility of these systems, whereas in CO-PrOx the Au/CeO2–Al2O3 catalysts with medium cerium loading (Ce/Ce + Al = 5 and 10 mol%) present the highest CO conversion at 50–60 °C. The catalysts are stable at 100 °C in CO + O2 + H2 mixtures. The addition of CO2 in the stream strongly deactivates Au/CeO2, whereas Au/CeO2–Al2O3 is less affected. Whatever the catalyst, the presence of steam has no significant effect on the catalytic performances.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► CeO2–Al2O3 (CeXAl) were prepared by Evaporation Induced Self Assembly. ► Some Au/CeXAl present higher oxygen mobility and storage capacity than CeO2. ► The reducibility, oxygen mobility and storage capacity increase with Ce content. ► The CO conversion (without H2) increases with the cerium content of the support. ► Au/CeXAl catalysts with medium Ce content are the most performant in CO-PrOx.

Keywords
CO oxidation; Preferential CO oxidation; CO-PrOx; Gold; Ceria; CeO2–Al2O3
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Preferential CO oxidation over nanosized gold catalysts supported on ceria and amorphous ceria–alumina
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 128, 30 November 2012, Pages 10–20
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
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Any Questions? feel free to contact us