Abstract
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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