Tailored temperature window of MnOx-CeO2 SCR catalyst by addition of acidic metal oxides

doi:10.1016/S1872-2067(14)60106-6

Chinese Journal of Catalysis ›› 2014, Vol. 35 ›› Issue (8): 1281-1288.DOI: 10.1016/S1872-2067(14)60106-6

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Tailored temperature window of MnO_x-CeO₂ SCR catalyst by addition of acidic metal oxides

Jiuyuan Nie^a, Xiaodong Wu^b,c, Ziran Ma^b, Tengfei Xu^a, Zhichun Si^c, Lei Chen^c, Duan Weng^b,c

a. State Key Laboratory of New Ceramics & Fine Process, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;
b. The Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;
c. Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, Guangdong, China

Received:2014-03-30 Revised:2014-04-11 Online:2014-08-01 Published:2014-08-05
Supported by:
This work was supported by the National Basic Research Program of China (973 Program, 2010CB732304), the National High Technology Research and Development Program of China (863 Program, 2013AA065302), and the National Natural Science Foundation of China (51202126).

Abstract

Abstract:

A MnO_x-CeO₂ catalyst was modified with various acidic metal oxides (Nb₂O₅, WO₃, and MoO₃) using a sol-gel method. The activities of the obtained catalysts were measured for the selective catalytic reduction (SCR) of NO_x with NH₃ to screen suitable acidic metal oxides for different temperature windows. The catalytic activities for NO and NH₃ oxidation were also evaluated. The catalysts were characterized by X-ray diffraction, N₂ adsorption, H₂ temperature-programmed reduction, NH₃/NO_x temperature-programmed desorption analyses, and infrared spectroscopic measurements of NH₃/NO_x adsorption. The MnO_x-CeO₂ catalyst exhibited the greatest low-temperature (100-150 ℃) activity. The addition of acidic metal oxides weakened the redox properties of the catalyst, resulting in inhibition of the partial oxidation of the adsorbed NH₃ and NO₂-assisted fast SCR reactions. Meanwhile, the oxidation of NH₃ at relatively high temperatures (250-350 ℃) was suppressed, and the adsorption of NH₃ on Brönsted and Lewis acid sites was strengthened. Consequently, the temperature window of SCR reaction shifted to higher temperatures in the order Nb₂O₅< WO₃< MoO₃.

Key words: Selective catalytic reduction, MnO_x-CeO₂ mixed oxide, Acidic metal oxide, Temperature window, Redox site, Acid site

Jiuyuan Nie, Xiaodong Wu, Ziran Ma, Tengfei Xu, Zhichun Si, Lei Chen, Duan Weng. Tailored temperature window of MnO_x-CeO₂ SCR catalyst by addition of acidic metal oxides[J]. Chinese Journal of Catalysis, 2014, 35(8): 1281-1288.

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Tailored temperature window of MnO_x-CeO₂ SCR catalyst by addition of acidic metal oxides

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