Citation: Xiaojiang Yao, Kaili Ma, Weixin Zou, Shenggui He, Jibin An, Fumo Yang, Lin Dong. Influence of preparation methods on the physicochemical properties and catalytic performance of MnO_x-CeO₂ catalysts for NH₃-SCR at low temperature[J]. Chinese Journal of Catalysis, ;2017, 38(1): 146-159. doi: 10.1016/S1872-2067(16)62572-X shu

Influence of preparation methods on the physicochemical properties and catalytic performance of MnO_x-CeO₂ catalysts for NH₃-SCR at low temperature

Xiaojiang Yao ^a, ,
Kaili Ma ^b ,
Weixin Zou ^b ,
Shenggui He ^c ,
Jibin An ^d ,
Fumo Yang ^a,e ,
Lin Dong ^b

a Key Laboratory of Reservoir Aquatic Environment of CAS, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China;
b Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, Jiangsu, China;
c Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;
d Chongqing Key Laboratory of Environmental Materials and Remediation Technology, Chongqing University of Arts and Sciences, Chongqing 402160, China;
e Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, Fujian, China

Received Date: 1 September 2016
Revised Date: 28 September 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (No. 21507130)

This work examines the influence of preparation methods on the physicochemical properties and catalytic performance of MnO_x-CeO₂ catalysts for selective catalytic reduction of NO by NH₃ (NH₃-SCR) at low temperature. Five different methods, namely, mechanical mixing, impregnation, hydrothermal treatment, co-precipitation, and a sol-gel technique, were used to synthesize MnO_x-CeO₂ catalysts. The catalysts were characterized in detail, and an NH₃-SCR model reaction was chosen to evaluate the catalytic performance. The results showed that the preparation methods affected the catalytic performance in the order:hydrothermal treatment > sol-gel > co-precipitation > impregnation > mechanical mixing. This order correlated with the surface Ce³⁺ and Mn⁴⁺ content, oxygen vacancies and surface adsorbed oxygen species concentration, and the amount of acidic sites and acidic strength. This trend is related to redox interactions between MnO_x and CeO₂. The catalyst formed by a hydrothermal treatment exhibited excellent physicochemical properties, optimal cata-lytic performance, and good H₂O resistance in NH₃-SCR reaction. This was attributed to incorpora-tion of Mnⁿ⁺ into the CeO₂ lattice to form a uniform ceria-based solid solution (containing Mn-O-Ce structures). Strengthening of the electronic interactions between MnO_x and CeO₂, driven by the high-temperature and high-pressure conditions during the hydrothermal treatment also improved the catalyst characteristics. Thus, the hydrothermal treatment method is an efficient and environ-ment-friendly route to synthesizing low-temperature denitrification (deNO_x) catalysts.
- MnO_x-CeO₂ catalyst,
- Preparation method,
- Nitrogen oxides,
- Low-temperature NH₃-SCR,
- Electron interaction,
- Surface acidity
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Influence of preparation methods on the physicochemical properties and catalytic performance of MnO_x-CeO₂ catalysts for NH₃-SCR at low temperature