Abstract
FeO x , MnO x and Fe–Mn–O x catalysts were prepared by the co-precipitation method and used for the selective catalytic reduction (SCR) of NO x by NH3 at low temperature. Fe–Mn–O x catalyst showed the best catalytic activity and above 80% NO x conversion was obtained at 50–150 °C. Nearly 80% N2 selectivity of Fe–Mn–O x catalyst was acquired at the whole temperature range. The excellent low-temperature SCR activity and N2 selectivity were ascribed to the abundant surface acid sites, the formation of Fe–O–Mn species, co-existence of multiple valence states (Mn4+, Mn3+ and Mn2+) and the proper redox ability. In addition, the interaction between Fe and Mn species over the Fe–Mn–O x catalyst was responsible for the improvement of SCR performance and N2 selectivity.
Graphical Abstract
Fe–Mn–O x catalysts were prepared by the co-precipitation method and used for the selective catalytic reduction (SCR) of NO x by NH3 at low temperature. The formation of Fe–O–Mn species contributed to the co-existence of multiple valence states (Mn4+, Mn3+, Mn2+, Fe3+ and Fe2+), resulting in an increase in catalytic activity and N2 selectivity. Besides, the abundance of acid sites was responsible for the superior N2 selectivity.
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Acknowledgements
The project was supported by the National Program on Key Basic Research Project of China (973 Program, 2014CB643404), the National Natural Science Foundation of China (21567030 and 11447191) and the Natural Science Fund item of Yunnan Province under the Grant Number 2013FD033.
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Xia, F., Song, Z., Liu, X. et al. Improved catalytic activity and N2 selectivity of Fe–Mn–O x catalyst for selective catalytic reduction of NO by NH3 at low temperature. Res Chem Intermed 44, 2703–2717 (2018). https://doi.org/10.1007/s11164-018-3255-x
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DOI: https://doi.org/10.1007/s11164-018-3255-x