Citation: SHEN Bo-xiong, LU feng-ju, GAO Lan-jun, YUE Shi-ji. Study on alkali and alkaline earths poisoning characteristics for a commercial SCR catalyst[J]. Journal of Fuel Chemistry and Technology, ;2016, 44(4): 500-506. shu

Study on alkali and alkaline earths poisoning characteristics for a commercial SCR catalyst

1.
School of Energy & Environmental Engineering, Hebei University of Technology, Tianjin 300401, China
2.
College of Environmental Science & Engineering, Nankai University, Tianjin 300071, China

Corresponding author: SHEN Bo-xiong, shenboxiong0722@sina.com
Received Date: 16 October 2015
Revised Date: 2 December 2015

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The poisoning of a commercial selective catalytic reduction (SCR) catalysts by alkali (K) and alkaline earths (Ca) has been simulated in the laboratory. The techniques of N₂ adsorption, scanning electronic microscopy, X-ray photoelectron spectroscopy, NH₃-temperature program desorption, H₂-temperature program reduction were used to identify the changes of physical chemical characteristics of the catalysts before and after the simulated poisoning. The results indicated that the poisoning of K and Ca did not damage the basic pore structure of the SCR catalyst, but decreased the BET surface area and pore volume. The poisoning by K and Ca changed the chemical valence state of V and decreased the reducibility of V. The poisoning by K and Ca decreased the amount of chemically adsorbed oxygen on the catalyst surface as well as acidity of the catalysts. The poisoning by K and Ca lowered the SCR activity of the catalysts and the poisoning by Ca was more serious than K.
- middle temperature SCR catalysts,
- alkali poisoning,
- alkaline earths poisoning,
- de-NO_x activity,
- catalysts characterization
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沈阳化工大学材料科学与工程学院沈阳 110142