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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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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; Co-bonded (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.

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


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