Modelling of Selective Catalytic Reduction of NOx with NH3 over the Fe-Cu/ZSM-5 Catalyst
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Thermal and Environmental Engineering Institute, Tongji University, Shanghai 200092, China
Shanghai Environmental Sanitation Engineering Design Institute Co.Ltd., Shanghai 200232, China
College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
Submission date: 2023-02-20
Final revision date: 2023-04-15
Acceptance date: 2023-04-25
Online publication date: 2023-06-06
Publication date: 2023-06-23
Corresponding author
Zhenzhen Guan   

Department of Thermal Engineering, Shanghai University of Electric Power, China
Pol. J. Environ. Stud. 2023;32(4):3437–3446
In this paper, a kinetic model was developed to simulate the reaction process of the Fe-Cu/zeolite Socony Mobil-5 (ZSM-5) catalyst for selective catalytic reduction of NOx with NH3 (NH3-SCR). The global kinetic modeling accounted for various reactions occurring in SCR, including NH3 adsorption/ desorption, standard SCR, fast SCR, slow SCR, NH3 oxidation, NO oxidation and N2O formation reactions. The denitrification experiments were performed in a flow reactor with a feed stream, and the model could accurately predict the steady state conversion of NO at the reactor outlet. The results showed that the Fe-Cu/ZSM-5 catalyst exhibited an excellent catalytic activity, a high N2 selectivity and an extended operating-temperature window across all temperatures ranging from 70 to 600ºC. By analyzing the influencing factors of the denitrification reaction, the results showed the temperature window shifted to lower temperatures with the gas hourly space velocity (GHSV), molar ratio of NH3/NO (normalized stoichiometric ratio, NSR), molar ratio of NO2/NOx as well as NO inlet concentration, and the operating window could be broadened with an increase in the O2 concentration; lower GHSVs promoted the N2O formation. Due to ZSM-5 being rich in oxygen, the Fe-Cu/ZSM-5 catalyst exhibited high catalytic activity even without O2. The research findings could provide insight into improving low temperature SCR reactivity of zeolite-based catalysts.