Citation: ZHANG E-song, YU Jie, WANG Le-le, WANG Ben, SUN Lu-shi. Deactivation and regeneration of commercial SCR catalysts used in coal fired power plant[J]. Journal of Fuel Chemistry and Technology, ;2018, 46(10): 1249-1256. shu

Deactivation and regeneration of commercial SCR catalysts used in coal fired power plant

ZHANG E-song ¹ ,
YU Jie ^1,, ,
WANG Le-le ^1,2 ,
WANG Ben ¹ ,
SUN Lu-shi ¹

1.
State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China
2.
Xi'an Thermal Power Research Institute Co. Ltd., Suzhou branch, Suzhou 215153, China

Corresponding author: YU Jie, yujie@hust.edu.cn
Received Date: 12 June 2018
Revised Date: 23 July 2018

Figures(11)

The activity of SCR catalyst used in a coal-fired power plant for 24000 h was tested. With the help of XRD, BET, XRF, FT-IR and XPS, it is found that the catalyst has some problems such as micropore and mesopore plugging and the oxidation of active substances, which leads to the deactivation of the catalyst. Water washing and H₂SO₄ washing were used to remove plugs in the pores of the catalyst. The result shows that water washing can resume part of vanadium species and H₂SO₄ washing can renew the active sites on the surface of catalyst and uniformly load the sulfur species which can increase the acidity of active site. The SO₂ sulphation treatment was performed on the catalyst after water washing. It is indicated that the Brønsted acid and the Lewis acid sites have higher strength and the Lewis acid has higher density than that by H₂SO₄ washing. After the regeneration treatment, H₂SO₄ washed catalyst activity is restored to the level of fresh catalyst above 250 ℃. And the activity of SO₂ sulphation catalyst at 450 ℃ reaches 104.6% of the fresh catalyst activity at 380 ℃.
- SCR catalysts,
- denitrification,
- deactivation,
- regeneration,
- sulphation
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