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The promotion effect of Fe on CeZr2O x catalyst for the low-temperature SCR of NO x by NH3

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Abstract

Fe was used as the modifier to improve the performance of CeZr2O x catalyst for the selective catalytic reduction (SCR) reaction with ammonia. Experimental results revealed that proper Fe species (Fe/Ce molar ratio = 2) could effectively improve the SCR activity of CeZr2O x , along with the elevated resistance to SO2 and H2O. The characterization results including BET, XRD, H2-TPR and NH3-TPD confirmed that Fe species in Fe2CeZr2O x catalyst could inhibit the formation of ZrO2 crystals and lead to higher reducibility and surface acidity. In addition, more Ce3+ and surface active oxygen species could be detected on Fe2CeZr2O x compared with CeZr2O x . By means of in situ DRIFT technique, it could be deduced that the SCR reaction process over Fe2CeZr2O x was accelerated mainly through theL–H pathway due to the advanced adsorption of NH3 and NO x species, along with the promoted NO conversion to NO2. Therefore, the modification of CeZrO x catalyst by Fe had a significant stimulation effect on its low-temperature SCR performance.

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Acknowledgements

This work was supported by the Natural Science Foundation of China (21546014) and the Natural Science Foundation of Shanghai, China (14ZR1417800).

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Authors and Affiliations

  1. School of Energy Source and Mechanical Engineering, Shanghai University of Electric Power, Shanghai, 200090, People’s Republic of China

    Xiao Sun, Rui-tang Guo, Ming-yuan Li, Peng Sun, Wei-guo Pan, Shu-ming Liu, Jian Liu & Shuai-wei Liu

  2. Shanghai Engineering Research Center of Power Generation Environment Protection, Shanghai, 200090, People’s Republic of China

    Xiao Sun, Rui-tang Guo, Ming-yuan Li, Peng Sun, Wei-guo Pan, Shu-ming Liu, Jian Liu & Shuai-wei Liu

  3. Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, People’s Republic of China

    Rui-tang Guo

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  1. Xiao Sun
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Sun, X., Guo, Rt., Li, My. et al. The promotion effect of Fe on CeZr2O x catalyst for the low-temperature SCR of NO x by NH3. Res Chem Intermed 44, 3455–3474 (2018). https://doi.org/10.1007/s11164-018-3318-z

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  • DOI: https://doi.org/10.1007/s11164-018-3318-z

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