MnFe/Al2O3 Catalyst Synthesized by Deposition Precipitation for Low-Temperature Selective Catalytic Reduction of NO with NH3

Mn-Fe/Al2O3 and Mn-Fe/TiO2 catalysts have been prepared by impregnation (IMP) and deposition precipitation (DP) and characterized with several techniques including: XRDP, N-2-physisorption, NH3-TPD, H-2-TPR, TGA and XPS. 40 wt% Mn0.75Fe0.25/Al2O3 prepared with ammonia carbamate as precipitating agent showed the same superior low temperature selective catalytic reduction of NO with NH3 as did 25 wt% Mn0.75Fe0.25/TiO2 prepared in the same way. Both catalysts were much more active when prepared by DP instead of IMP. 25 wt% Mn0.75Fe0.25/TiO2 and 40 wt% Mn0.75Fe0.25/Al2O3 prepared by DP were exposed to a gas containing 20 vol% H2O at temperatures between 140 and 200 A degrees C and compared to an industrial V2O5-WO3/TiO2 catalyst tested at 220 A degrees C. Both homemade catalysts were severely inhibited by 20 vol% H2O. However, used at 180 A degrees C they match the activity of the industrial reference at 220 A degrees C. [GRAPHICS] .