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

YAN Dong-jie; GUO Tong; YU Ya; CHEN Zhao-hui

doi:10.1016/S1872-5813(21)60003-8

Volume 49 Issue 1

Jan. 2021

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Article Navigation > Journal of Fuel Chemistry and Technology > 2021 > 49(1): 113-120

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

Citation:

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

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

doi: 10.1016/S1872-5813(21)60003-8

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

Funds: 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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Corresponding author: E-mail: yandongjie_2000@163.com
Received Date: 2020-09-11
Rev Recd Date: 2020-10-11
Publish Date: 2021-01-29

Abstract

Abstract

The effect of lead on the catalytic performance of Mn-Ce/TiO₂ catalysts in the selective catalytic reduction (SCR) of NO_x 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.
- selective catalytic reduction,
- Mn-Ce/TiO₂,
- Pb poisoning,
- regeneration

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References(27)

References

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