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Mechanistic study of the SCR of NO with propylene over Co/ZSM-5 using in-situ FT-IR

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Abstract

The selective catalytic reduction (SCR) of NO with propylene over Co-exchanged ZSM-5 (Co/ZSM-5) was studied using in-situ FTIR. Propylene was activated easily by NO in the absence of oxygen above 200°C, leading to the formation of three different types of surface NCO species; Cobonded (2235 and 2195 cm−1), Si-bonded (2300 cm−1) and Al-bonded (2272 cm−1). These surface NCO species were stable in NO or oxygen atmosphere up to 400°C but in NO+oxygen they were easily converted to the final products of N2 and CO2. It is supposed that the SCR of NO over Co/ZSM-5 occurs through the Co- and Al-bonded NCO intermediates and its conversion is the rate-limiting step.

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Authors and Affiliations

  1. Industrial Catalysis Research Team, Korea Research Institute of Chemical Technology, P.O. Box 107, 305-606, Taejon, Korea

    S. S. Goryashenko, Y. K. Park, D. S. Kim & S. -E. Park

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  1. S. S. Goryashenko
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  2. Y. K. Park
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  3. D. S. Kim
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  4. S. -E. Park
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Goryashenko, S.S., Park, Y.K., Kim, D.S. et al. Mechanistic study of the SCR of NO with propylene over Co/ZSM-5 using in-situ FT-IR. Res. Chem. Intermed. 24, 933–951 (1998). https://doi.org/10.1163/156856798X00636

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  • DOI: https://doi.org/10.1163/156856798X00636

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