Citation: WANG Dong, WU Jing-kun, NIU Sheng-li, LU Chun-mei, XU Li-ting, YU He-wei, LI Jing. Structural property of γ-Fe₂O₃ catalysts doped with Sn and Ti and their activity in the selective catalytic reduction of NO_x[J]. Journal of Fuel Chemistry and Technology, ;2015, 43(7): 876-883. shu

Structural property of γ-Fe₂O₃ catalysts doped with Sn and Ti and their activity in the selective catalytic reduction of NO_x

WANG Dong ^1,2 ,
WU Jing-kun ¹ ,
NIU Sheng-li ^1,2 ,
LU Chun-mei ^1,2,, ,
XU Li-ting ^1,2 ,
YU He-wei ¹ ,
LI Jing ³

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

Corresponding author: LU Chun-mei,
Received Date: 10 May 2015
Available Online: 26 June 2015
Fund Project: 国家自然科学基金(51276101) (51276101) 高等学校博士学科点专项科研基金(20120131110022) (20120131110022) 山东大学基本科研业务费专项资金(2015JC024)。 (2015JC024)

A series of γ-Fe₂O₃ catalysts doped with Sn and Ti (γ-Fe_0.95Ti_0.05O_z, γ-Fe_0.95Sn_0.05O_z, and γ-Fe_0.95Sn_0.025Ti_0.025O_z) were prepared by the microwave assisted co-precipitation method. The crystal phase, pore structure, surface element distribution and microscopic morphology of the doped γ-Fe₂O₃ catalysts were characterized by X-ray diffraction (XRD), N₂ sorption, energy dispersive spectrometer (EDS) and scanning electron microscope (SEM); the influence of Sn and Ti doping on their activity in the selective catalytic reduction (SCR) of NO_x was investigated. The results indicated that Sn and Ti are highly dispersed as amorphous species in crystal lattice of γ-Fe₂O₃, forming sosoloid with Fe. Through doping with Ti, the γ-Fe_0.95Ti_0.05O_z catalyst exhibits a high de-NO_x efficiency of above 90% at 250~400 ℃, with a maximum of 98.3%; the addition of Ti is effective to reduce the crystallization degree of γ-Fe₂O₃, improve the pore structure of 2~100 nm, and suppress the formation of α-Fe₂O₃ phase, which are of benefits to get tiny and uniform discrete γ-Fe₂O₃ particles with high activity in SCR. However, Sn as an additive may aggravate the sintering and derogate pore structure of 2~6 nm for the γ-Fe_0.95Sn_0.05O_z catalyst, which is detrimental to SCR. The incorporation of both Sn and Ti leads to a decrease of the surface O/Fe atomic ratio from 1.83 to 1.33; the dramatic decrease of surface lattice oxygen content due to the synergistic effect between Sn and Ti may restrain the SCR activity of γ-Fe_0.95Sn_0.025Ti_0.025O_z.
- selective catalytic reduction (SCR),
- de-NO_x,
- catalyst,
- γ-Fe₂O₃,
- additives doped
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Structural property of γ-Fe2O3 catalysts doped with Sn and Ti and their activity in the selective catalytic reduction of NOx

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通讯作者: 陈斌, bchen63@163.com

Structural property of γ-Fe₂O₃ catalysts doped with Sn and Ti and their activity in the selective catalytic reduction of NO_x