Citation: PiJun Gong, JunLin Xie, De Fang, Da Han, Feng He, FengXiang Li, Kai Qi. Effects of surface physicochemical properties on NH₃-SCR activity of MnO₂ catalysts with different crystal structures[J]. Chinese Journal of Catalysis, ;2017, 38(11): 1925-1934. doi: 10.1016/S1872-2067(17)62922-X shu

Effects of surface physicochemical properties on NH₃-SCR activity of MnO₂ catalysts with different crystal structures

PiJun Gong ^a,c, ,
JunLin Xie ^a,b,c ,
De Fang ^a,b ,
Da Han ^a,c ,
Feng He ^a,c ,
FengXiang Li ^a,c ,
Kai Qi ^a,c

a State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, Hubei, China;
b Center for Materials Research and Analysis, Wuhan University of Technology, Wuhan 430070, Hubei, China;
c School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, China

Received Date: 24 August 2017
Revised Date: 25 September 2017

Fund Project: This work was supported by the National Natural Science Foundation of China (51502221).

α-, β-, δ-, and γ-MnO₂ nanocrystals are successfully prepared. We then evaluated the NH₃ selective catalytic reduction (SCR) performance of the MnO₂ catalysts with different phases. The NO_x conversion efficiency decreased in the order:γ-MnO₂ > α-MnO₂ > δ-MnO₂ > β-MnO₂. The NO_x conversion with the use of γ-MnO₂ and α-MnO₂ catalysts reached 90% in the temperature range of 140-200℃, while that based on β-MnO₂ reached only 40% at 200℃. The γ-MnO₂ and α-MnO₂ nanowire crystal morphologies enabled good dispersion of the catalysts and resulted in a relatively high specific surface area. We found that γ-MnO₂ and α-MnO₂ possessed stronger reducing abilities and more and stronger acidic sites than the other catalysts. In addition, more chemisorbed oxygen existed on the surface of the γ-MnO₂ and α-MnO₂ catalysts. The γ-MnO₂ and α-MnO₂ catalysts showed excellent performance in the low-temperature SCR of NO to N₂ with NH₃.
- MnO₂,
- Crystal structure,
- Surface-active oxygen,
- Selective catalytic reduction,
- Physicochemical property
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Effects of surface physicochemical properties on NH₃-SCR activity of MnO₂ catalysts with different crystal structures