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

Mechanistic study of the SCR of NO with propylene over Co/ZSM-5 using in-situ FT-IR 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

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

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Publisher
Springer Journals
Copyright
Copyright © 1998 by Springer
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1163/156856798X00636
Publisher site
See Article on Publisher Site

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.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Apr 15, 2009

References

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