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Reaction and Characterization of Co and Ce Doped Mn/TiO2 Catalysts for Low-Temperature SCR of NO with NH3

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Abstract

The catalysts of cobalt and cerium doped Mn/TiO2 were tested for low-temperature selective catalytic reduction of NO with NH3, and these samples were characterized by XRD, XPS, Raman, H2-TPR and NH3-TPD methods. The catalytic activity results showed that the NOx conversion was obviously improved by Co and Ce doping. Ternary metal oxide catalyst Mn–Co–Ce/TiO2 exhibited the highest catalytic activity of 99 % at 423 K. The XRD and Raman analysis indicated formation of MnO2 or CoMnO3 phases on Mn/TiO2 and Mn–Co/TiO2. The XPS results demonstrated that the metal cations existed mainly in the form of Mn4+, Co2+ and Ce4+, respectively. XPS and H2-TPR results supported the presence of Mn–Co mixed oxides. Doping of Ce could enhance dispersion of Mn–Co oxides on the surface. Addition of Co and Ce led to higher surface Mn4+/Mn3+ ratio, chemisorbed oxygen, acidity and dispersity, which enhanced NH3 adsorption and oxidation of NO to NO2, subsequently, the NOx reduction was accelerated through the Fast SCR reaction.

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Acknowledgment

This Project was financially supported by Science and Technology Commission of ShenZhen Municipality (Nos. JCYJ20120613154128107, JCYJ20140417172417138) and Ministry of Construction, People’s Republic of China (2008-k4-5).

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Authors and Affiliations

  1. Environmental Science and Engineering Research Center, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, 518055, People’s Republic of China

    Lu Qiu, Jiaojiao Meng, Dandan Pang, Changliang Zhang & Feng Ouyang

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  1. Lu Qiu
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  2. Jiaojiao Meng
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  3. Dandan Pang
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  4. Changliang Zhang
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  5. Feng Ouyang
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Correspondence to Feng Ouyang.

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Qiu, L., Meng, J., Pang, D. et al. Reaction and Characterization of Co and Ce Doped Mn/TiO2 Catalysts for Low-Temperature SCR of NO with NH3 . Catal Lett 145, 1500–1509 (2015). https://doi.org/10.1007/s10562-015-1556-x

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