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Characterization and catalytic performance of Cu/CeO2 and Cu/MgO-CeO2 catalysts for NO reduction by CO

Paper ID Volume ID Publish Year Pages File Format Full-Text
42327 45920 2009 8 PDF Available
Title
Characterization and catalytic performance of Cu/CeO2 and Cu/MgO-CeO2 catalysts for NO reduction by CO
Abstract

Copper supported on ceria and ceria-magnesia catalysts were synthesized and used for NO reduction by CO. The supports and the subsequent Cu catalysts were prepared by citric acid sol–gel and impregnation methods, respectively. Based on XRD, TPR and EPR measurements, it is found that the Mg addition promotes not only the dispersion of CuO, but also the doping of copper ions into CeO2 matrix. A redox treatment favors some of copper ions in the octahedral sites of CeO2 substituting the lattice sites of Ce4+. Combining the results of activity test, we found that the formation of copper-substituted Cu-O-Ce solid solution promotes the catalytic activity of the catalysts. Also, the ways that MgO acts on the dispersion of CuO and the formation of Cu-O-Ce solid solutions were investigated with the aid of TEM, TGA and XRD techniques. The results of these studies suggest that magnesia crystallites undergo a phase evolvement during the preparation process of Cu/MgO-CeO2, leading to the reconstitution of the support and hence the improvement of copper dispersion, BET surface area, pore volume, as well as the doping of copper ions into the CeO2 matrix.

Graphical abstractThe addition of MgO into Cu/CeO2 promotes the formation of Cu-O-Ce solid solution. The formation of Cu-O-Ce solid solution in Cu/MgO-CeO2 is further improved when treated by a redox process. The sample with more Cu-O-Ce solid solution shows higher NO conversion (Cu/CeO2 < Cu/MgO-CeO2 < redox-treated Cu/MgO-CeO2).Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Copper; Ceria; Magnesia-ceria; NO reduction by CO
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Characterization and catalytic performance of Cu/CeO2 and Cu/MgO-CeO2 catalysts for NO reduction by CO
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 363, Issues 1–2, 1 July 2009, Pages 208–215
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