New Insight into SO2 Poisoning and Regeneration of CeO2 -WO3 /TiO2 and V2 O5 -WO3 /TiO2 Catalysts for Low-Temperature NH3 -SCR

Environmental Science & Technology
Liwen XuJunhua Li

Abstract

In this study, the poisoning effects of SO2 on the V2O5-WO3/TiO2 (1%VWTi) and CeO2-WO3/TiO2 (5%CeWTi) selective catalytic reduction (SCR) catalysts were investigated in the presence of steam, and also the regeneration of deactivated catalysts was studied. After pretreating the catalysts in a flow of NH3 + SO2 + H2O + O2 at 200 °C for 24 h, it was observed that the low-temperature SCR (LT-SCR) activity decreased significantly over the 1%VWTi and 5%CeWTi catalysts. For 1%VWTi, NH4HSO4 (ABS) was the main product detected after the poisoning process. Both of NH4HSO4 and cerium sulfate species were formed on the poisoned 5%CeWTi catalyst, indicating that SO2 reacted with Ce3+/Ce4+, even in the presence of high concentration of NH3. The decrease of BET specific surface area, NO x adsorption capacity, the ratio of chemisorbed oxygen, and reducibility were responsible for the irreversible deactivation of the poisoned 5%CeWTi catalyst. Meanwhile, the LT-SCR activity could be recovered over the poisoned 1%VWTi after regeneration at 400 °C, but not for the 5%CeWTi catalyst. For industrial application, it is suggested that the regeneration process can be utilized for 1%VWTi catalysts after a period of time after NH4HSO4 accumulated on the ...Continue Reading

References

Nov 23, 2010·Environmental Science & Technology·Liang ChenMaofa Ge
Jun 10, 2011·Chemical Communications : Chem Comm·Wenpo ShanChangbin Zhang
Nov 21, 2015·Environmental Science & Technology·Zhiwei HuangXingfu Tang

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Citations

May 3, 2019·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·J J PlataJavier Fernández Sanz
Oct 4, 2020·Environmental Science and Pollution Research International·Ran AoYi Wei
Jun 17, 2021·Environmental Science & Technology·Zhen ChenJunhua Li
Oct 5, 2018·Environmental Science & Technology·Qingru WuJiming Hao
Oct 17, 2020·Environmental Science & Technology·Lin KangDengsong Zhang
Feb 12, 2020·Environmental Science & Technology·Zhengda YangXiang Gao
Dec 23, 2021·Environmental Science & Technology·Zhiping SiDengsong Zhang

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