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Catalysts 2018, 8(9), 375; https://doi.org/10.3390/catal8090375

Ce and Zr Modified WO3-TiO2 Catalysts for Selective Catalytic Reduction of NOx by NH3

1
National Engineering Research Center of Rare Earth Metallurgy and Functional Materials, Baotou Research Institute of Rare Earths, Baotou 014030, China
2
School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
*
Authors to whom correspondence should be addressed.
Received: 21 August 2018 / Revised: 25 August 2018 / Accepted: 3 September 2018 / Published: 5 September 2018
(This article belongs to the Special Issue Catalytic Applications of CeO2-Based Materials)
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Abstract

A series of Ce and/or Zr modified WO3-TiO2 catalysts were synthesized by the impregnation method, which were employed for NH3-SCR reaction. The T50 contour lines of NOx were used to quickly optimize catalyst composition, the Ce20Zr12.5WTi catalyst was considered to be the optimization result, and also exhibited excellent NH3-SCR activity and thermal stability with broad operation temperature window, which is a very promising catalyst for NOx abatement from diesel engine exhaust. The excellent catalytic performance is associated with the formation of Ce-Zr solid solution. The introduction of Zr to CeWTi catalyst facilitated the redox of Ce4+/Ce3+ and the formation of more acid sites, more Ce3+ ions, more oxygen vacancies, larger quantities of surface adsorbed oxygen species and NH3, which were beneficial for the excellent selective catalytic reduction (SCR) performance. View Full-Text
Keywords: NH3-SCR; nitrogen oxides; Ce-Zr solid solution; T50 contour line NH3-SCR; nitrogen oxides; Ce-Zr solid solution; T50 contour line
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Zhao, W.; Li, Z.; Wang, Y.; Fan, R.; Zhang, C.; Wang, Y.; Guo, X.; Wang, R.; Zhang, S. Ce and Zr Modified WO3-TiO2 Catalysts for Selective Catalytic Reduction of NOx by NH3. Catalysts 2018, 8, 375.

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