Abstract
The impact of PbO on CeO2-MoO3/TiO2 catalyst for selective catalytic reduction of NO with NH3 was studied and analyzed with BET, XRD, XPS, NH3-TPD, H2-TPR and in situ DRIFTS characterizations. The catalytic activity results showed that PbO could greatly deactivate CeO2-MoO3/TiO2 catalyst. PbO could interact with Mo species to form PbMoO4 while inhibit the transformation from surface Ce4+ to Ce3+, which caused a significant decrease in the surface acidity and reducibility of CeO2-MoO3/TiO2 catalyst. The oxidation of NO to NO2 was suppressed owing to a decline in the amount of surface chemisorbed oxygen. Additionally, the adsorption of NH3 and NOx on Brønsted and Lewis acid sites was restrained. These factors were responsible for the deactivation of CeO2-MoO3/TiO2 catalyst by PbO. The in situ DRIFTS results suggested that the NH3-SCR reaction on CeO2-MoO3/TiO2 catalyst was governed by E-R and L-H mechanisms, which wasn’t changed by PbO.
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