期刊
ACS CATALYSIS
卷 6, 期 9, 页码 5807-5815出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.6b01121
关键词
selective catalytic reduction; nitric oxide; MnOx/TiO2 catalyst; TiO2 preferentially exposed facets; Mn dispersion; isotopic labeling experiment
资金
- Specialized Research Fund for the Doctoral Program of Higher Education [SRFDP-2012009111001]
- NNSFC [21202141, 21173182]
- Opening Foundation of the Key Laboratory of Environmental Materials and Engineering of Jiangsu Province [K14010]
- Key Science & Technology Specific Projects of Yangzhou [YZ20122029]
- Yangzhou Nature Science Foundation [YZ2014040]
MnOx/TiO2 (anatase) nanosheets (NS) with a preferentially exposed {001} facet was found to be a better catalyst for selective catalytic reduction (SCR) of NO than conventionally employed MnOx/TiO2 nanoparticles (NP) with the {101} facet preferentially exposed, affording both high NO conversion and high N-2 selectivity at 80-280 degrees C. Further investigations indicated that Mn3+ as the major species on TiO2 (NS) was incorporated into octahedral vacancies with a lower polymerization degree, resulting in high catalytic activity for SCR and low activity for NH3 oxidation, thus restraining the undesirable N2O generation. In comparison, on the surface of TiO2 (NP), Mn4+ as the major species was incorporated into tetrahedral vacancies in a highly polymerized state, leading to lower NO conversion and lower N-2 selectivity. The results indicate that it is possible to enhance the low-temperature SCR activity of the catalysts by tailoring the preferentially exposed facet of TiO2.
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