Regeneration characteristics of Ca-poisoned commercial selective catalytic reduction denitrification catalyst

XU Xin-rong; WU Hao; YU Le-meng; ZHUANG Ke; TANG Guang-hua; YANG Hong-min

doi:10.19906/j.cnki.JFCT.2022068

Volume 51 Issue 4

Apr. 2023

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Article Navigation > Journal of Fuel Chemistry and Technology > 2023 > 51(4): 502-510

XU Xin-rong, WU Hao, YU Le-meng, ZHUANG Ke, TANG Guang-hua, YANG Hong-min. Regeneration characteristics of Ca-poisoned commercial selective catalytic reduction denitrification catalyst[J]. Journal of Fuel Chemistry and Technology, 2023, 51(4): 502-510. doi: 10.19906/j.cnki.JFCT.2022068

Citation:

XU Xin-rong, WU Hao, YU Le-meng, ZHUANG Ke, TANG Guang-hua, YANG Hong-min. Regeneration characteristics of Ca-poisoned commercial selective catalytic reduction denitrification catalyst[J]. Journal of Fuel Chemistry and Technology, 2023, 51(4): 502-510. doi: 10.19906/j.cnki.JFCT.2022068

Citation:

XU Xin-rong, WU Hao, YU Le-meng, ZHUANG Ke, TANG Guang-hua, YANG Hong-min. Regeneration characteristics of Ca-poisoned commercial selective catalytic reduction denitrification catalyst[J]. Journal of Fuel Chemistry and Technology, 2023, 51(4): 502-510. doi: 10.19906/j.cnki.JFCT.2022068

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Regeneration characteristics of Ca-poisoned commercial selective catalytic reduction denitrification catalyst

doi: 10.19906/j.cnki.JFCT.2022068

1.
School of Energy & Mechanical Engineering, Nanjing Normal University, Nanjing 210023, China
2.
Guodian Environmental Protection Research Institute, Nanjing 210031, China
3.
Nanjing Guodian Environmental Protection Technology Co., Ltd, Nanjing 210061, China

Funds: The project was supported by the National Natural Science Foundation of China (51676101)， the Natural Science Foundation of Jiangsu Province (BK20161558) and the Social Development of Jiangsu Province General Project (BE2020754).

Received Date: 2022-06-24
Accepted Date: 2022-08-03
Rev Recd Date: 2022-07-31

Available Online: 2022-08-11

Publish Date: 2023-04-15

Abstract

Abstract

Alkaline earth metal calcium is a typical poison in coal-fired power plants, which will result in deactivation of SCR catalyst. The ATMP (amino trimethylene phosphonic acid) and PBTCA (2-phosphonobutane-1,2,4-tricarboxylic acid) complexing agents were employed for the regeneration of a poisoned by calcium V₂O₅-WO₃/TiO₂ catalyst. The physical and chemical properties and regeneration denitration performance of the catalyst before and after regeneration were investigated by BET, NH₃-TPD, H₂-TPR, XPS and experiments. The results indicated that the ATMP and PBTCA exhibited efficient regeneration performance, and the NO_x conversion of regenerating catalysts recovered from 25.8% to 89.8% and 88.1% at 400 ℃, respectively. Compared with the regeneration by dilute sulfuric acid, the ATMP and PBTCA exhibited a higher calcium removal rate with lower vanadium loss (less than 5%). The utilization of the ATMP and PBTCA can effectively restore the Brønsted acid sites, active vanadium V^{5 +} and the surface chemisorbed oxygen O_α on the catalyst surface, which leads to the overall activity of the catalyst reaching an optimal level. Therefore, it has a great potential to apply ATMP and PBTCA complexing agents in the regeneration of deactivated SCR denitration catalysts.
- SCR catalysts,
- denitrification,
- Ca-poisoned,
- regeneration,
- complexing agent

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References(30)

References

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