Mesoporous 30 wt% Mn0.6Fe0.4/TiO2 has been prepared by a novel hydrothermal method using a structure directing agent and characterized by N2 adsorption, SEM, XRD, EDX, H2-TPR and the catalytic activity for the selective catalytic reduction (SCR) of NO by ammonia was measured under power plant flue gas conditions. Compared to 30 wt% Mn0.6Fe0.4/TiO2 prepared by impregnation, the average pore size was significantly increased. The method of preparation has only a small effect on the catalytic activity at temperatures between 125 and 300 °C. The hydrothermal preparation method leads to a somewhat higher (NH4)2SO4 tolerance at 150 °C compared to the impregnation preparation method. Regeneration of the (NH4)2SO4 loaded samples by heating to 400 °C was not possible whereas water washing yielded better regeneration. The catalysts are significantly more active than a commercial VWT SCR catalyst at temperatures up to 200 °C, but do not match the activity of the latter at the higher temperatures typically encountered at the high dust position in power plants.
Catalysis Letters, 2014, Vol 144, Issue 3, p. 395-402
Low temperature NH3 SCR; Mesoporous TiO2; Mn–Fe; Sol–gel; Hydrothermal