Citation: Xiaojiang Yao, Jun Cao, Li Chen, Keke Kang, Yang Chen, Mi Tian, Fumo Yang. Doping effect of cations (Zr⁴⁺, Al³⁺, and Si⁴⁺) on MnO_x/CeO₂ nano-rod catalyst for NH₃-SCR reaction at low temperature[J]. Chinese Journal of Catalysis, ;2019, 40(5): 733-743. doi: 10.1016/S1872-2067(18)63204-8 shu

Doping effect of cations (Zr⁴⁺, Al³⁺, and Si⁴⁺) on MnO_x/CeO₂ nano-rod catalyst for NH₃-SCR reaction at low temperature

Xiaojiang Yao ^a, ,
Jun Cao ^a ,
Li Chen ^a ,
Keke Kang ^a ,
Yang Chen ^a ,
Mi Tian ^a ,
Fumo Yang ^b,c

a Research Center for Atmospheric Environment, Key Laboratory of Reservoir Aquatic Environment of CAS, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China;
b National Engineering Research Center for Flue Gas Desulfurization, School of Architecture and Environment, Sichuan University, Chengdu 610065, Sichuan, China;
c Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, Fujian, China

Received Date: 24 October 2018
Revised Date: 22 November 2018

Fund Project: This work was supported by National Natural Science Foundation of China (21876168, 21507130), Youth Innovation Promotion Association of CAS (2019376), and the Chongqing Science &

Thermally stable Zr⁴⁺, Al³⁺, and Si⁴⁺ cations were incorporated into the lattice of CeO₂ nano-rods (i.e., CeO₂-NR) in order to improve the specific surface area. The undoped and Zr⁴⁺, Al³⁺, and Si⁴⁺ doped nano-rods were used as supports to prepare MnO_x/CeO₂-NR, MnO_x/CZ-NR, MnO_x/CA-NR, and MnO_x/CS-NR catalysts, respectively. The prepared supports and catalysts were comprehensively characterized by transmission electron microscopy (TEM), high-resolution TEM, X-ray diffraction, Raman and N₂-physisorption analyses, hydrogen temperature-programmed reduction, ammonia temperature-programmed desorption, in situ diffuse reflectance infrared Fourier-transform spectroscopic analysis of the NH₃ adsorption, and X-ray photoelectron spectroscopy. Moreover, the catalytic performance and H₂O+SO₂ tolerance of these samples were evaluated through NH₃-selective catalytic reduction (NH₃-SCR) in the absence or presence of H₂O and SO₂. The obtained results show that the MnO_x/CS-NR catalyst exhibits the highest NO_x conversion and the lowest N₂O concentration, which result from the largest number of oxygen vacancies and acid sites, the highest Mn⁴⁺ content, and the lowest redox ability. The MnO_x/CS-NR catalyst also presents excellent resistance to H₂O and SO₂. All of these phenomena suggest that Si⁴⁺ is the optimal dopant for the MnO_x/CeO₂-NR catalyst.
- MnO_x/CeO₂ nano-rod catalyst,
- Doping effect,
- Oxygen vacancy,
- Surface acidity,
- Low-temperature NH₃-SCR reaction
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Doping effect of cations (Zr4+, Al3+, and Si4+) on MnOx/CeO2 nano-rod catalyst for NH3-SCR reaction at low temperature

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通讯作者: 陈斌, bchen63@163.com

Doping effect of cations (Zr⁴⁺, Al³⁺, and Si⁴⁺) on MnO_x/CeO₂ nano-rod catalyst for NH₃-SCR reaction at low temperature