The catalytic activity of CuO–CeO 2 mixed oxides for diesel soot oxidation with a NO/O 2 mixture

Copper doped ceria and ceria–zirconia mixed oxides were synthesized using the citric acid sol–gel method. The temperature-programmed oxidation (TPO) results showed that the Cu modification improved the low-temperature activity and the selectivity to CO 2 of ceria for soot oxidation in the presence o...

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Bibliographic Details
Published inCatalysis communications Vol. 8; no. 12; pp. 2110 - 2114
Main Authors Wu, Xiaodong, Liang, Qing, Weng, Duan, Lu, Zhenxiang
Format Journal Article
LanguageEnglish
Published Elsevier B.V 2007
Subjects
Copper oxide–ceria
Nitrate storage capacity
Selectivity
Soot
Thermal stability
Soot
Copper oxide–ceria
Nitrate storage capacity
Selectivity
Thermal stability
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Summary:Copper doped ceria and ceria–zirconia mixed oxides were synthesized using the citric acid sol–gel method. The temperature-programmed oxidation (TPO) results showed that the Cu modification improved the low-temperature activity and the selectivity to CO 2 of ceria for soot oxidation in the presence of NO and excess oxygen even after ageing at 800 °C for 20 h in flow air. Meanwhile, not only the segregation of Cu and sintering of CuO, but also the separation of Ce- and Zr-rich phases worsened the activity of the Cu–Ce–Zr catalyst after the high-temperature calcination.
ISSN:1566-7367
1873-3905
DOI:10.1016/j.catcom.2007.04.023