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High-Efficiency Environmental-Friendly Fe–W–Ti Catalyst for Selective Catalytic Reduction of NO with NH3: The Structure–Activity Relationship

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Abstract

Iron-based catalysts are nontoxic and have outstanding medium-temperature activity, which are considered as potential catalysts for the selective catalytic reduction of NOx with NH3 (NH3-SCR). In this work, Fe (0.2)-W (0.05)-Ti catalyst prepared by deposition–precipitation exhibited over 90% NOx conversion within the range of 280–420 °C and excellent resistance to SO2 or H2O. The excellent catalytic performance was due to the high proportion of Fe2+/(Fe2+ + Fe3+) and Oads/(Oads + Olat) ratio and abundant surface acid sites. However, the catalyst lost part low-temperature catalytic performance after hydrothermal aging at 670 °C for 64 h. The surface area, proportion of Fe2+/(Fe2+ + Fe3+) and Oads/(Oads + Olat) decreased significantly after aged. As a result, the lack of sufficiently active site to produce NO2 resulted in the significant decrease for NOx conversion at low-temperature section. Simultaneously, the decline of the surface acidity, especially the strong acid, meant that the adsorption capacity of the catalyst under high temperature weakened and the NO conversion corresponding declined.

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Acknowledgements

This work was supported by Science and Technology Service Network Initiative (STS) of Chinese Academy of Science (KFJ-SW-STS-149), the National Natural Science Foundation of China (21407154, 21507137), Province Natural Science Foundation of GanSu (17jRSRA317) and the West Light Foundation of the Chinese Academy of Sciences.

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Authors and Affiliations

  1. State Key Laboratory for Oxo Synthesis and Selective Oxidation, National Engineering Research Center for Fine Petrochemical Intermediates, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, People’s Republic of China

    Kun Zhao, Weiliang Han, Zhicheng Tang & Xun Hu

  2. Key laboratory of Oil &Gas Fine Chemical, Ministry of Education, College of Chemistry and Chemical Engineering, Xinjiang University, Ürümqi, 830046, People’s Republic of China

    Kun Zhao & Jiangyin Lu

Authors
  1. Kun Zhao
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  2. Weiliang Han
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  3. Zhicheng Tang
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  4. Jiangyin Lu
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  5. Xun Hu
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Corresponding author

Correspondence to Zhicheng Tang.

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Zhao, K., Han, W., Tang, Z. et al. High-Efficiency Environmental-Friendly Fe–W–Ti Catalyst for Selective Catalytic Reduction of NO with NH3: The Structure–Activity Relationship. Catal Surv Asia 22, 20–30 (2018). https://doi.org/10.1007/s10563-017-9238-x

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