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Effect of iridium dispersion on the catalytic activity of Ir/SiO2 for the selective reduction of NO with CO in the presence of O2 and SO2

✍ Scribed by Masaaki Haneda; Tadahiro Fujitani; Hideaki Hamada

Publisher
Elsevier Science
Year
2006
Tongue
English
Weight
365 KB
Volume
256
Category
Article
ISSN
1381-1169

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✦ Synopsis

The effect of iridium dispersion on the activity of Ir/SiO 2 for the selective reduction of NO with CO in the presence of O 2 and SO 2 has been investigated. The intrinsic activity, expressed in terms of turnover frequency (TOF), increases with decreasing iridium dispersion, indicating that NO reduction with CO over Ir/SiO 2 is a structure-sensitive reaction. Characterization of Ir/SiO 2 using TPO, XRD and FT-IR spectroscopy following CO adsorption shows that larger iridium crystallites are more difficult to be oxidized and much easier to be reduced under reaction conditions, resulting in the formation of stable iridium metal sites on which NO reduction occurs.

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## Abstract The selective catalytic reduction rate of NO with N‐containing reducing agents can be enhanced considerably by converting a part of NO into NO~2~. The enhanced reaction rate is more pronounced at lower temperatures by using an equimolar mixture of NO and NO~2~. The kinetics of NO oxidat