The reactions and composition of the surface intermediate species in the selective catalytic reduction of NOx with ethylene over Co-ZSM-5 |
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Authors: | Jin-Hai Niu Ai-Min Zhu Chuan Shi Hong-Yu Fan Xiao-Mei Chen Xue-Feng Yang |
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Affiliation: | (1) Laboratory of Plasma Physical Chemistry, Dalian University of Technology, Box 288, Dalian, 116024, P. R. China |
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Abstract: | A pretreatment-transient reaction product analysis method was applied to study the reactions and average composition of the possible surface intermediate species in selective catalytic reduction with ethylene of NO x over Co-ZSM-5. The reactions of the surface species, formed by the pretreatment of Co-ZSM-5 in a NO/C2H4/O2 mixture at 275°C, with the NO/O2 flow produced much more N2 than that with the individual NO or O2 flow. The similarity of N2/CO x /H2O product distribution generated from the above surface species-NO/O2 reactions and that from the normal NO/C2H4/O2 flow reactions implies that the surface species NC a O b H c formed in the three-component pretreatment process is very likely the primary intermediate surface species generated during the real flow reactions. The in situ FT-IR (DRIFT) spectroscopy measurements of the surface species support the above conclusion. |
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Keywords: | Surface intermediate species DeNO x selective catalytic reduction (SCR) Co-ZSM-5 ethylene in situ FT-IR (DRIFT) spectroscopy |
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