A study of the mechanism of iron‐based sulfate catalyst for selective catalytic reduction of NO with NH3

Abstract

ABSTRACTThe catalytic activity of iron‐based sulfate catalyst in selective catalytic reduction (SCR) of NO with NH3 in the presence/absence of O2 was investigated. Powder X‐ray diffraction (XRD), X‐ray photoelectron spectroscopy (XPS), and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFT) are applied to study the iron‐based sulfate catalyst. The iron‐based sulfate catalyst shows considerable catalytic activity for the SCR reaction at 350–450 °C in the presence of O2. NO and NH3 reacted with the stoichiometry ratio of 1:1 over iron‐based sulfate catalysts in the absence of O2 at 350 °C. By the comparison of NO conversion in the absence/presence of O2, an SCR reaction mechanism that included NH3 oxidation by Fe3+ and the re‐oxidation of Fe2+ is inferred on the basis of the results obtained from XRD, XPS, and DRIFT. Copyright © 2011 Curtin University of Technology and John Wiley & Sons, Ltd.