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Highly active gold-ceria catalyst for the room temperature oxidation of carbon monoxide

Paper ID Volume ID Publish Year Pages File Format Full-Text
44204 46007 2006 8 PDF Available
Title
Highly active gold-ceria catalyst for the room temperature oxidation of carbon monoxide
Abstract

Ceria supported gold catalysts containing 0.1–5 wt.% gold are prepared by deposition–precipitation technique in which the precipitate is subjected to ultrasound treatment and aging in the parent solution at 65 °C for 2 h prior to filtration and drying. The catalysts are found to be very active for the room temperature oxidation of CO. Au/CeO2 catalyst containing as low as 1 wt.% Au is found to be a highly active catalyst for the room temperature oxidation of CO to CO2 with complete conversion of CO and specific activity up to 490 × 10−4 molCO s−1 gAu−1. The catalyst shows good stability and sustains its high activity for a prolonged period. Aging of the catalyst in the parent solution is found to be important in obtaining a highly active catalyst. The catalysts are characterized by XRD, SEM, TEM, XPS and TPR/TPD. TPR, TPD and XPS studies suggest that the active site for CO oxidation may be a combination of Au+OH− and metallic gold in interface with reduced Ce3+ sites. In other words, the presence of highly dispersed gold particles in close contact with the ceria surface defects is vital for the superior performance of the catalyst.

Keywords
Gold-ceria catalyst; CO oxidation; Room temperature oxidation; Deposition–precipitation
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Highly active gold-ceria catalyst for the room temperature oxidation of carbon monoxide
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 299, 17 January 2006, Pages 266–273
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
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Full-text PDF Download
Online Support
Any Questions? feel free to contact us