Cs promoted Ag/Al2O3catalysts for selective catalytic reduction of NOx by methane: effect of SO2 and H2O

Abstract

Highly active alumina supported silver nano-particles were evaluated for SCR of NO_x using methane in an excess oxygen atmosphere. Cs promoted Ag/Al₂O₃ catalysts showed high NO reduction activity. In addition, the prepared materials exhibited promotional effects in the presence of SO₂ and H₂O. The X-ray diffraction profiles of fresh and used catalysts indicated that the prepared materials are thermally stable up to 70 h of time-on-stream reaction. Activity results well correlated with the characterization data, which revealed that the high deNO_x ability was due to superior NO adsorption properties as well as the presence of an appropriate amount of Ag⁺ and metallic Ag particles.