Citation: YANG Xi, SU Ya-xin, QIAN Wen-yan, YUAN Min-hao, ZHOU Hao, DENG Wen-yi, ZHAO Bing-tao. Experimental study on selective catalytic reduction of NO by C₃H₆ over Fe-Ag/Al₂O₃ catalysts[J]. Journal of Fuel Chemistry and Technology, ;2017, 45(11): 1365-1375. shu

Experimental study on selective catalytic reduction of NO by C₃H₆ over Fe-Ag/Al₂O₃ catalysts

1.
School of Environmental Science and Engineering, Donghua University, Shanghai 201620, China
2.
Changzhou Vocational Institute of Engineering, Changzhou 213164, China
3.
School of Energy and Power Engineering, University of Shanghai Science and Technology, Shanghai 200093, China

Corresponding author: SU Ya-xin, suyx@dhu.edu.cn
Received Date: 29 June 2017
Revised Date: 1 September 2017

Fund Project: The project was supported by the National Natural Science Foundation of China (51278095), Natural Science Foundation of Shanghai (17ZR1419300)and Jiangsu Province Prospective Joint Research Projects(BY2015032-02)the National Natural Science Foundation of China 51278095Natural Science Foundation of Shanghai 17ZR1419300Jiangsu Province Prospective Joint Research Projects BY2015032-02

Figures(9)

Sol-gel and impregnation methods were used to prepare the Fe/Ag/Al₂O₃ catalysts supported on the monolithic cordierite with different Fe/Ag loading ratios. The catalytic performance to reduce NO with C₃H₆ was evaluated in a one-dimensional electrically heated temperature programmed ceramic tubular reactor in simulated flue gas atmosphere at 200-700 ℃. The results show that the NO reduction efficiency on 7.2Fe/1.9Ag/20Al₂O₃/CM with C₃H₆ is more than 90% and reaches about 100% at the temperatures of 500 ℃ and 550 ℃ respectively. Iron can effectively improve the ability of Ag/20Al₂O₃/CM catalysts to resist SO₂ and H₂O in flue gas. When SO₂ and H₂O are 0.02% and 8% in the flue gas, the NO reduction efficiency is almost not influenced on 7.2Fe/1.9Ag/20Al₂O₃/CM at 500 ℃. The 90% NO reduction efficiency is maintained during 6 h without decrease. However, the catalytic activity of 2Ag/20Al₂O₃/CM without iron modification is strongly influenced by SO₂ and H₂O in the flue gas. The NO reduction efficiency on Ag/20Al₂O₃/CM decreases rapidly from about 70% to 46% and 25% respectively, when the SO₂ and H₂O are 0.02% and 8% in the flue gas. The results of XRD and SEM of the catalyst show that AgFeO₂ and Fe³⁺ are formed in the 7.2Fe/1.9Ag/20Al₂O₃/CM catalyst after the modification by iron, and the surface of the catalyst become loose and porous, forming Fe₃O₄-based needle-like and flaky crystals. H₂-TPR results show that 7.2Fe/1.9Ag/20Al₂O₃/CM has better reduction properties than Ag/20Al₂O₃/CM in the wider temperature range. Pyridine adsorption Infrared Spectroscopy (Py-FTIR) experimental results show that Fe increases the Lewis acid sites in the catalyst surface.
- selective catalytic reduction of NO,
- C₃H₆,
- Fe-Ag/Al₂O₃ catalyst
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Experimental study on selective catalytic reduction of NO by C₃H₆ over Fe-Ag/Al₂O₃ catalysts