Influence of Alkali Metals with Different Ionic Radius Doping into Ce.sub.0.7Zr.sub.0.3O.sub.2 on the Active Oxygen

Influence of Alkali Metals with Different Ionic Radius Doping into Ce.sub.0.7Zr.sub.0.3O.sub.2 on the Active Oxygen

A series of xM-Ce.sub.0.7Zr.sub.0.3O.sub.2 prepared by citric acid sol-gel method exhibited different catalytic activity for soot oxidation, which varies as the content and ionic radius of doping metals changed. 0.15 K-CZ had the best catalytic performance. The results of H.sub.2-TPR, O.sub.2-TPD an...

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Veröffentlicht in:Catalysis letters 2014-04, Vol.144 (4), p.685
Hauptverfasser: Liang, Hong, Wu, Shaotao, Hong, Yanxia, Li, Shuhua, Chen, Yao, Yu, Xinwei, Ye, Daiqi
Format: Artikel
Sprache:eng
Schlagworte:
Active oxygen
Organic acids
Superoxides
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Zusammenfassung:A series of xM-Ce.sub.0.7Zr.sub.0.3O.sub.2 prepared by citric acid sol-gel method exhibited different catalytic activity for soot oxidation, which varies as the content and ionic radius of doping metals changed. 0.15 K-CZ had the best catalytic performance. The results of H.sub.2-TPR, O.sub.2-TPD and XPS demonstrate that the active oxygen species can be adjusted and controlled by doping alkali metals with different ionic radius into Ce.sub.0.7Zr.sub.0.3O.sub.2. Three kinds of active oxygen species are involved in the soot oxidation reaction sequence, and superoxide ionic is the key species.
ISSN:1011-372X
1572-879X
DOI:10.1007/s10562-014-1195-7