Deactivation by sulfur dioxide of alumina-based catalysts for selective catalytic reduction of nitrogen monoxide by ethene

The title reaction over alumina and 5.0 wt% Me (Me: Co, Fe or Cu) added alumina catalysts (View the MathML source) was investigated in the presence of SO2. Their NO reduction activities were decreased by SO2 poisoning, depending on the kinds of the catalysts. A most strongly poisoned catalyst was View the MathML source, followed by Al2O3, View the MathML source, and View the MathML source. The XPS studies of deactivated View the MathML source catalysts revealed that sulfate-ion like species were formed on all the catalysts, and moreover, on Fe or View the MathML source, corresponding metal-sulfate like species were also formed. The selective catalytic reduction of NO2 by ethene in the presence of SO2 was also investigated, and some mechanistic discussion was given.