Selective catalytic reduction failure of low NH3-NOx ratio

Piqiang Tan; Xiaoyu Li; Shiyan Wang; Zhiyuan Hu; Diming Lou

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Selective catalytic reduction failure of low NH₃-NO_x ratio

Catalysis, Kinetics and Reaction Engineering | Updated：2026-01-06

- Selective catalytic reduction failure of low NH₃-NO_x ratio
- Selective catalytic reduction failure of low NH₃-NO_x ratio
- 中国化学工程学报（英文版） 2021年32卷第4期页码：231-240
- Affiliations：
  
  School of Automobile Studies, Tongji University,Shanghai,China,201804
- Author bio：
- Funds：
- DOI：
  中图分类号：
- 纸质出版：2021
- Accepted：
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Piqiang Tan, Xiaoyu Li, Shiyan Wang, 等. Selective catalytic reduction failure of low NH₃-NO_x ratio[J]. 中国化学工程学报（英文版）, 2021,32(4):231-240.

-NO
Piqiang Tan, Xiaoyu Li, Shiyan Wang, 等. Selective catalytic reduction failure of low NH₃-NO_x ratio[J]. 中国化学工程学报（英文版）, 2021,32(4):231-240. DOI：

-NO DOI：

摘要

Abstract

An insufficient amount of NH

(ammonia) will reduce the conversion efficiency of NO

which may lead to excess NO

emissions

resulting in NH

-SCR failure. In this article

SCR failure caused by a low NH

-NO

ratio is studied systematically by experiments. The main reasons for a low NH

-NO

ratio in SCR include insufficient urea injection

hydrothermal aging of catalysts and urea crystallization. It was found from an insufficient urea injection experiment that with the increase of NH

-NO

ratio

the NO

conversion efficiency of the SCR system increased

but the ammonia leakage also increased. The main influencing factors of NO

conversion efficiency are different under different NH

-NO

ratios. A flow reactor system was used in the catalyst hydrothermal aging experiment to investigate the effect of hydrothermal aging on catalyst activity. After a 24 h hydrothermal aging experiment at 800℃

the NO

conversion efficiency of the copper-based zeolite catalysts d

ecreased significantly at the boundary of medium and low temperature regions. And the NO

-NO

ratio in the mixture had a significant effect on the catalytic performance. Thermogravimetry coupled to Fourier transform infrared spectroscopy (TG-FTIR) was used to analyze the composition of urea deposits in a urea deposits analysis experiment. It was found that the main components of urea deposits were urea and isocyanic acid (HNCO). Preventing HNCO polymerization

especially the formation of CYA

can decrease the formation of urea deposits.

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