Selective Catalytic Reduction of NO with Ammonia over Fe Promoted Mo/ZSM-5 Catalysts

Abstract

Abstract: The Fe-Mo/ZSM-5 catalysts with different Fe/Mo molar ratios were prepared by using impregnation method. The activity of Fe-Mo/ZSM-5 catalysts for selective catalytic reduction of NO with ammonia and the effects of reaction conditions were also studied. It was found that Fe-Mo/ZSM-5 is more active than both of Mo/ZSM-5 and Fe/ZSM-5 separately, and it exhibits the best performance for SCR reaction when n(Fe)/n(Mo) ratio is 1.5, for which the highest NO_x conversion reached 96% at the temperature of 430 ℃. The experiment results also show that Fe-Mo/ZSM-5 catalyst has a good stability of SCR reaction, for higher catalytic activity was gained under the condition of high space velocity and varied O₂concentrations. The bulk phase and surface structures were determined by XRD, XPS techniques respectively. The results show that there is a strong interaction among Fe, Mo and HZSM-5, and the surface Mo_3d percentage is the largest when n(Fe)/n(Mo) ratio is 1.5, which may be related to its better catalytic performance for catalytic reduction of NO. It is also important to notice that NO₂ was not detected during the XPS measurement, and NO was the main species during SCR reaction on the surface of Fe-Mo/ZSM-5 catalyst. From this it can be deduced that NO is directly reacted with ammonia to form nitrogen and water on the surface of the catalyst.

Key words: Fe-Mo/ZSM-5 catalyst, Molar ratio of Fe to Mo, Nitrogen monooxide, Selective catalytic reduction, Surface Mo_3d percentage

CLC Number:

O643

TrendMD:

LI Zhe, CHEN Bing, HUANG Wei, XIE Ke-Chang
. Selective Catalytic Reduction of NO with Ammonia over Fe Promoted Mo/ZSM-5 Catalysts[J]. Chem. J. Chinese Universities, doi: .

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[10]	LI Jun-Hua, HAO Ji-Ming, FU Li-Xin, ZHU Tian-Le, CHEN Ling-Lin . Selective Catalytic Reduction of Nitrogen Oxide by Propene over Noble CatalystSIn the Pressence of Exess Oxygen [J]. Chem. J. Chinese Universities, 2003, 24(11): 2060.
[11]	JIA Ming-Jun, LI Xue-Mei, WANG Gui-Ying, ZHANG Wen-Xiang, WU Tong-Hao. Selective Catalytic Reduction of NO with C₃H₆ on CuCl/MCM-41 Prepared by Disperse Method [J]. Chem. J. Chinese Universities, 2002, 23(5): 923.
[12]	ZHANG Wen-Xiang, JIA Ming-Jun, ZHANG Chun-Lei, ZHANG Li-Hua, WU Tong-Hao, SUN Tie, YAHIRO Hidenori, IWAMOTOM asakazu . FTIR and TPD Studies of Adsorption Properties of Nitrogen Monooxide over Copper Ion exchanged Zeolites [J]. Chem. J. Chinese Universities, 1998, 19(7): 1112.
[13]	JIA Ming-Jun, ZHANG Wen-Xiang, XIAO Feng-Shou, WU Tong-Hao, SUN Tie . Selective Catalytic Reduction of NO with C₃H₆ over CuCl/ZSM-5 Zeolites Prepared by Disperse Method [J]. Chem. J. Chinese Universities, 1998, 19(4): 606.
[14]	ZHANG Wen-Xiang, JIA Ming-Jun, WU Tong-Hao, SUN Tie, YAHIRO Hidenori, IWAMOTO Masakazu, JUN Izumi. Adsorption Prperties of Nitrogen Monooxide on Metal Ion-exchanged Zeolites [J]. Chem. J. Chinese Universities, 1997, 18(12): 1999.

Selective Catalytic Reduction of NO with Ammonia over Fe Promoted Mo/ZSM-5 Catalysts

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