Influence of Ce-doping on MnOx-ZSM-5 catalysts for the selective catalytic reduction of NO/NO2 with NH3
A series of MnO x -CeO 2 /ZSM-5 catalysts with different Ce loadings were prepared through the impregnation method and characterized by BET, XRD, SEM, H 2 -TPR, and XPS. The performances of selective catalytic reduction (SCR) of NO/NO 2 with NH 3 and NO oxidation over MnO x -CeO 2 /ZSM-5 catalysts w...
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Published in | Reaction kinetics, mechanisms and catalysis Vol. 125; no. 2; pp. 1071 - 1084 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Cham
Springer International Publishing
01.12.2018
|
Subjects | |
Online Access | Get full text |
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Summary: | A series of MnO
x
-CeO
2
/ZSM-5 catalysts with different Ce loadings were prepared through the impregnation method and characterized by BET, XRD, SEM, H
2
-TPR, and XPS. The performances of selective catalytic reduction (SCR) of NO/NO
2
with NH
3
and NO oxidation over MnO
x
-CeO
2
/ZSM-5 catalysts were investigated. The result showed that the MnO
x
dispersions, redox abilities and proportions of Mn
4+
of catalysts were enhanced by the doping of CeO
2
. However, the excessive Ce loadings led to the accumulation of active components on the catalyst surface. The sample with Ce/Mn molar ratio of 0.39 exhibited the best SCR performance, the NO
x
conversion achieved 95.4% at 150 °C, and maintained higher than 95% in a wide operating temperature range (150–350 °C). MnO
x
-CeO
2
/ZSM-5 also exhibited considerable catalytic performance of NO oxidation, the maximum conversion of NO achieved 56.5% at 350 °C. |
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ISSN: | 1878-5190 1878-5204 |
DOI: | 10.1007/s11144-018-1460-7 |