SO2-induced stability of Ag-alumina catalysts in the SCR of NO with methane

Abstract. We report on a stabilization effect on the structure and activity of Ag/Al2O3 for the selective catalytic reduction (SCR) of NOx with CH4 imparted by the presence of SO2 in the exhaust gasmixture. The reaction is carried out at temperature above 600 oC to keep the surface partially free of sulfates. In SO2-free gases, catalyst deactivation is fast and measurable at these temperatu…