NDLI: Investigation of the active sites for NO oxidation reactions over MnO<sub>x</sub>

Content Provider	Royal Society of Chemistry (RSC)
Author	Wang, Jianqiang Sun, Zhihui Zhu, Jinxin Wang, Chen Wang, Jun Shen, Meiqing
Copyright Year	2017
Abstract	MnOx–CeO2 is a potential substitute for commercial Pt-based diesel oxidation catalysts. To better investigate its active sites for NO oxidation reactions, a series of MnOx–CeO2 samples with low Mn doping amounts (≤5%) were synthesized using the incipient-wetness impregnation method. The catalysts were characterized by various techniques (XRD, BET, XPS and H2-TPR). According to XRD and XPS, a trace amount of manganese enriched on the surface of CeO2 exists in higher oxidation states. With the increase of Mn doping, more Mn2+ is introduced into the CeO2 lattice. The interaction between the manganese oxides and ceria improves the redox properties of MnOx and the surface oxygen of CeO2. Combining turn over frequency with the initial reducibility from H2-TPR quantitation, it is found that H2 consumption from Mn4+/Mn3+ to Mn3O4 is equivalent to the active site for NO oxidation reactions. In conclusion, Mn4+/Mn3+ is the active species for NO oxidation reactions.
Starting Page	3106
Ending Page	3111
Page Count	6
File Format	HTM / HTML PDF
ISSN	11440546
Volume Number	41
Issue Number	8
Journal	New Journal of Chemistry
DOI	10.1039/c6nj03838g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	BET X-ray crystallography Oxygen Active site Cerium(IV) oxide Dopant Redox Manganese Crystal structure
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry Catalysis

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