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The synergetic mechanism between copper species and ceria in NO abatement over Cu/CeO2 catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
42349 45921 2010 7 PDF Available
Title
The synergetic mechanism between copper species and ceria in NO abatement over Cu/CeO2 catalysts
Abstract

Copper supported on ceria prepared by the impregnation method was used as a model catalyst to investigate the synergetic mechanism between copper species and ceria for NO reduction by CO. To identify the copper species in the catalyst, we treated the as-synthesized Cu/CeO2 by 30 wt.% nitric acid solution. Fresh and nitric acid treated Cu/CeO2 catalysts were characterized and compared with AAS, XRD, TPR, EPR, Raman and NO-TPD techniques. It is found that, after nitric acid treatment, there is only 0.27 wt.% Cu left (vs. 5 wt.% Cu in fresh sample); this is present in the following forms: (1) isolated copper ions in octahedral sites of ceria, (2) copper oxide clusters and (3) copper ions in ceria lattice. The residual small amount of Cu has a significant effect on surface structure, redox property and catalytic behavior of ceria, indicating that these copper species are crucial copper species inducing copper–ceria interactions. Moreover, it is suggested that the relative free movement of oxygen from ceria to supported copper, caused by the three copper species, leads to oxygen vacancies in ceria, significantly enhancing the NO conversion of Cu/CeO2 during NO + CO reaction.

Graphical abstractThe fresh and nitric acid treated Cu/CeO2 catalysts were characterized. The results indicated that three crucial copper species interacting with CeO2 change the surface structure of ceria, facilitating the relative free movement of oxygen from ceria to supported copper. This synergy between ceria and different copper species endows Cu/CeO2 with excellent activity for NO + CO reaction.Figure optionsDownload full-size imageDownload high-quality image (84 K)Download as PowerPoint slide

Keywords
Copper–ceria interaction; NO reduction by CO; Copper species; Oxygen vacancy; Oxygen transfer; Active site
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The synergetic mechanism between copper species and ceria in NO abatement over Cu/CeO2 catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 377, Issues 1–2, 1 April 2010, Pages 121–127
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