Citation: XIONG Zhi-bo, LU Chun-mei. Study on the modification of iron-cerium mixed oxide catalyst for selective catalytic reduction of NO[J]. Journal of Fuel Chemistry and Technology, ;2013, 41(3): 361-367. shu

Study on the modification of iron-cerium mixed oxide catalyst for selective catalytic reduction of NO

XIONG Zhi-bo ^1,2 ,
LU Chun-mei ^1,2,,

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

Corresponding author: LU Chun-mei,
Received Date: 5 August 2012
Available Online: 29 October 2012
Fund Project: 国家自然科学基金(51276101) (51276101)山东省自然科学基金(ZR2012EEM013) (ZR2012EEM013)

A series of iron-cerium mixed oxide catalysts modified titanium, zirconium, tungsten and molybdenum were prepared by co-precipitation. The selective catalytic reduction of NO_x with NH₃(NH₃-SCR) activity of the catalysts were carried out in a fixed-bed quartz tube reactor. The research results indicated that the addition of tungsten and molybdenum could increase the high-temperature NH₃-SCR activity of the iron-cerium mixed oxide catalysts, but decreased its low-temperature NH₃-SCR activity. Titanium could improve the NH₃-SCR activity of the iron-cerium mixed oxide catalyst within the range of reaction temperature, especially at low-temperature. Titanium was the most suitable assistant. When increasing the molar fraction of titanium from 0.10 to 0.40, the low-temperature NH₃-SCR activity of iron-cerium-titanium mixed oxide catalysts firstly increased and then decreased while the high-temperature activity gradually increased to 100%, and the optimum molar fraction of titanium was 0.15. The results of X-ray diffraction(XRD) and N₂ adsorption isotherms showed that the addition of titanium could optimize the pore structure of iron-cerium mixed oxide catalyst, and increased the BET surface and the pore volume of the iron-cerium mixed oxide catalyst, meanwhile refined its pore size. At the some cases, titanium could react with iron oxide and cerium oxide within the iron-cerium mixed oxide catalyst to form the solid solution. Therefore, the addition of titanium could enhance the NH₃-SCR activity of iron-cerium mixed oxide catalyst. Under the condition of the test, more than 90% of NO_x conversion could be achieved over Fe_0.8Ce_0.05Ti_0.15O_z catalyst at the temperature range of 150～400℃.
- iron-cerium mixed oxide catalyst,
- selective catalytic reduction(SCR) of NO,
- NO_x,
- titanium,
- modification
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