Deactivation of Mn/TiO2 catalyst for NH3-SCR reaction: effect of phosphorous

The deactivation mechanism of phosphorous on a Mn/TiO2 catalyst for selective catalytic reduction of NO with NH3 was investigated in this study. It was found that the NH3-SCR reaction over the Mn/TiO2 catalyst obeyed the Langmuir-Hinshelwood mechanism. From the characterization results, it could be found the addition of phosphorous on the Mn/TiO2 catalyst would decrease its reducibility and inhibit the adsorption of chemisorbed oxygen and NOx species on its surface. As a result, the P-doped Mn/TiO2 catalyst was deactivated.