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Citation: YAN Dong-jie, GUO Tong, YU Ya, CHEN Zhao-hui. Lead poisoning and regeneration of Mn-Ce/TiO2 catalysts for NH3-SCR of NOx at low temperature[J]. Journal of Fuel Chemistry and Technology, ;2021, 49(1): 113-120. doi: 10.1016/S1872-5813(21)60003-8 shu

Lead poisoning and regeneration of Mn-Ce/TiO2 catalysts for NH3-SCR of NOx at low temperature

  • Shaanxi Key Laboratory of Environmental Engineering, College of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China

  • Corresponding author: YAN Dong-jie, yandongjie_2000@163.com
  • Received Date: 11 September 2020
    Revised Date: 11 October 2020

    Fund Project: The project was supported by the Key R & D project of Shaanxi Province (2020SF-432) and the research project of Shaanxi Modern Architecture Design & Research Institute (XDKY-2020-04)

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  • The effect of lead on the catalytic performance of Mn-Ce/TiO2 catalysts in the selective catalytic reduction (SCR) of NOx with ammonia at low temperature was investigated; with the help of nitrogen sorption, XRD, FT-IR spectroscopy, H2-TPR and NH3-TPD characterization, the causes of lead poisoning and acid regeneration were clarified. The results indicate that the doping of Pb in Mn-Ce/TiO2 leads to a significant decrease of the low-temperature SCR activity; with a Pb loading of 11%, the conversion of NO over Mn-Ce/TiO2 at 180 °C decreases from original 100% on the fresh catalyst to 44% on the Pd-poisoned catalyst. The presence of Pb may reduce the content of active Mn4+ and Ce3+ species on the Mn-Ce/TiO2 catalyst, which suppresses the redox cycle of Mn4+ + Ce3+ ↔ Mn3+ + Ce4+; moreover, the decrease of surface acidity on the Mn-Ce/TiO2 catalyst by the doping of Pb is also disadvantageous to the adsorption and activation of NH3. The Pd-poisoned Mn-Ce/TiO2 can be regenerated by nitric acid treatment; after the regeneration, the catalytic activity of Mn-Ce/TiO2 in NH3-SCR of NO is almost completely recovered and even exceeds that of the fresh catalyst at 80–150 °C. The nitric acid treatment can restore the redox capacity of Mn-Ce/TiO2, increase the surface area, and create new acid sites, which contribute to recovery of the activity of Pb-poisoned Mn-Ce/TiO2 catalyst in NH3-SCR.
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