Citation: Zhongyi Sheng, Dingren Ma, Danqing Yu, Xiang Xiao, Bingjie Huang, Liu Yang, Sheng Wang. Synthesis of novel MnO_x@TiO₂ core-shell nanorod catalyst for low-temperature NH₃-selective catalytic reduction of NO_x with enhanced SO₂ tolerance[J]. Chinese Journal of Catalysis, ;2018, 39(4): 821-830. doi: 10.1016/S1872-2067(18)63059-1 shu

Synthesis of novel MnO_x@TiO₂ core-shell nanorod catalyst for low-temperature NH₃-selective catalytic reduction of NO_x with enhanced SO₂ tolerance

a School of Environment, Nanjing Normal University, Nanjing 210023, Jiangsu, China;
b School of Chemical Engineering and Technology, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China;
c Suzhou Industrial Technology Research Institute of Zhejiang University, Suzhou 215163, Jiangsu, China;
d State Power Environmental Protection Research Institute, Nanjing 210031, Jiangsu, China

Received Date: 19 February 2018
Revised Date: 12 March 2018

Fund Project: The work was supported by the National Natural Foundation of China (51508281, 41771498) and the Program of Natural Science Research of Jiangsu Higher Education Institutions of China (16KJD610001).

In this study, a MnO_x@TiO₂ core-shell catalyst prepared by a two-step method was used for the low-temperature selective catalytic reduction of NO_x with NH₃. The catalyst exhibits high activity, high stability, and excellent N₂ selectivity. Furthermore, it displays better SO₂ and H₂O tolerance than its MnO_x, TiO₂, and MnO_x/TiO₂ counterparts. The prepared catalyst was characterized systematically by transmission electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, Raman, BET, X-ray photoelectron spectroscopy, NH₃ temperature-programmed desorption and H₂ temperature-programmed reduction analyses. The optimized MnO_x@TiO₂ catalyst exhibits an obvious core-shell structure, where the TiO₂ shell is evenly distributed over the MnO_x nanorod core. The catalyst also presents abundant mesopores, Lewis-acid sites, and high redox capability, all of which enhance its catalytic performance. According to the XPS results, the decrease in the number of Mn⁴⁺ active centers after SO₂ poisoning is significantly lower in MnO_x@TiO₂ than in MnO_x/TiO₂. The core-shell structure is hence able to protect the catalytic active sites from H₂O and SO₂ poisoning.
- Low-temperature selective catalytic reduction,
- Core-shell,
- Nanorod,
- SO₂ resistance,
- MnO_x
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通讯作者: 陈斌, bchen63@163.com

Synthesis of novel MnO_x@TiO₂ core-shell nanorod catalyst for low-temperature NH₃-selective catalytic reduction of NO_x with enhanced SO₂ tolerance