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Catalytic performance of Ir/CeO2 for NO–C3H6–O2 reaction in a stoichiometric condition

Paper ID Volume ID Publish Year Pages File Format Full-Text
41486 45890 2011 6 PDF Available
Title
Catalytic performance of Ir/CeO2 for NO–C3H6–O2 reaction in a stoichiometric condition
Abstract

Supported iridium catalyst was found to be highly active for NO reduction with C3H6 in a stoichiometric condition. Among the supported iridium catalysts tested here, Ir/CeO2 showed the highest activity. In order to examine the influence of CeO2 support on the catalytic performance of supported iridium, we prepared CeO2 by precipitation method using different cerium precursors. Iridium catalyst supported on CeO2 prepared by using Ce(IV) precursor (Ce(NH4)2(NO3)6) showed higher activity for NO reduction with C3H6 than that by using Ce(III) precursor (Ce(NO3)3·6H2O), although the former catalyst has low BET surface area and low iridium dispersion. The activity of iridium catalyst supported on CeO2, which was prepared by using Ce(III) precursor, calcined at different temperature was also found to increase with increasing the calcination temperature of CeO2 support. The low activity of iridium catalyst supported on CeO2 calcined at 600 °C was considered to be due to a strong metal support interaction (SMSI) effect by the reaction gas treatment at 600 °C, resulting in the formation of less active Ir–CeO2 interacting species. On the other hand, the use of CeO2 calcined at higher temperatures was found to be important to obtain a catalytically active iridium species under the stoichiometric reaction condition.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (151 K)Download as PowerPoint slideResearch highlights▶ Supported Ir catalysts show extremely high performance for NO reduction by C3H6. ▶ Ir/CeO2 is one of the candidates applicable to three-way catalyst. ▶ The use of CeO2 with relatively high surface area causes SMSI effect. ▶ CeO2 with low surface area can keep Ir species in a catalytically active state.

Keywords
Ir/CeO2; three-way catalyst; NO reduction; strong metal support interaction
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Catalytic performance of Ir/CeO2 for NO–C3H6–O2 reaction in a stoichiometric condition
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 394, Issues 1–2, 28 February 2011, Pages 239–244
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