Abstract
Mn-based catalysts extremely restricted with the deactivation by SO2. In this paper, catalysts of Mn/TiO2 prepared by co-precipitation method for low temperature selective catalytic reduction (SCR) of NO with NH3 under the influence of SO2. For Mn/TiO2, NO conversion decreased rapidly from 90% to about 55% at 200 ℃ in the presence of SO2. We reveal the mechanism of SO2 effect on the adsorption of NH3 and NO based on DRIFT and TPD. The result show that SO2 can reduce the adsorption amount of NH3 on the Lewis acid sites and react with NH4+ to form NH4HSO3 on the Bronsted acid sites. In the meantime, SO2 can inhibit the adsorption of NO took part in the SCR reaction on the surface of catalyst due to the mechanical of competitive adsorption. These poisoning phenomenon of SO2 hinder the proceeding of SCR reaction.
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