Citation: ZHANG Xin-li, WANG Dong, PENG Jian-sheng, LU Chun-mei, XU Li-ting. Influence of calcination temperature on structural property of Mn doped γ-Fe₂O₃ catalysts and low-temperature SCR activity[J]. Journal of Fuel Chemistry and Technology, ;2015, 43(2): 243-250. shu

Influence of calcination temperature on structural property of Mn doped γ-Fe₂O₃ catalysts and low-temperature SCR activity

ZHANG Xin-li ¹ ,
WANG Dong ^1,2 ,
PENG Jian-sheng ¹ ,
LU Chun-mei ^1,2,, ,
XU Li-ting ^1,2

1.
1. School of Energy and Power Engineering, Shandong University, Jinan 250061, China;

Corresponding author: LU Chun-mei,
Received Date: 19 September 2014
Available Online: 25 November 2014
Fund Project: 国家自然科学基金(51276101) (51276101) 山东省自然科学基金(ZR2012EEM013) (ZR2012EEM013) 高等学校博士学科点专项科研基金(20120131110022)。 (20120131110022)

A series of Mn doped γ-Fe₂O₃ catalysts(Fe_0.7Mn_0.3O_z) were prepared with different calcining temperatures via a coprecipitation method, and the influences of calcination temperature on the low-temperature selective catalytic reduction (SCR) activity of Fe_0.7Mn_0.3O_z catalysts were investigated. The catalysts were characterized by N₂ adsorption-desorption, X-ray diffraction (XRD), scanning electron microscope (SEM), and energy dispersive spectrometer (EDS). The results indicate that Fe_0.7Mn_0.3O_z catalysts calcined at 350 ℃ exhibit the best low-temperature SCR activity, and the NO_x conversion reaches above 90% at 70 ℃ and 100% at 100~200 ℃, while the catalysts calcined at 450 ℃ show a poor low-temperature SCR activity. When the calcination temperature is 350 ℃, the catalysts possess the highest specific surface area and pore volume, flourishing pore structure and appropriate γ-Fe₂O₃ crystallinity. However, when the calcination temperature is increased to 400 or 450 ℃, the sintering takes place and α-Fe₂O₃ appears in Fe_0.7Mn_0.3O_z catalysts, which is unfavorable to the low-temperature SCR reaction. Therefore, 350 ℃ is recommended as the optimum calcination temperature for Fe_0.7Mn_0.3O_z catalysts.
- low-temperature selective catalytic reduction,
- catalyst,
- calcination temperature,
- γ-Fe₂O₃,
- Mn
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Influence of calcination temperature on structural property of Mn doped γ-Fe2O3 catalysts and low-temperature SCR activity

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Influence of calcination temperature on structural property of Mn doped γ-Fe₂O₃ catalysts and low-temperature SCR activity